How does this circuit work?

This house has 3 phase power.

I was replacing a downlight and found it having two black, two neutral,
and one blue incoming wire.

If the light switch was on, the blue wire was energized.
If the ceiling fan was on, one of the incoming black wire was energized.

Why/how do both light and fan work when both are on?

incoming downlight
a) ================(black)------------------
b) ================(neutral)----------------
c) ----------------(blue)------------------

On Wednesday, March 14, 2018 at 9:38:55 PM UTC-5, Oumati Asami wrote:
How does this circuit work?

This house has 3 phase power.

I was replacing a downlight and found it having two black, two neutral,
and one blue incoming wire.

If the light switch was on, the blue wire was energized.
If the ceiling fan was on, one of the incoming black wire was energized.

Why/how do both light and fan work when both are on?

incoming downlight
a) ================(black)------------------
b) ================(neutral)----------------
c) ----------------(blue)------------------


Knowing which country you reside in would help. ^_^

[8~{} Uncle Electric Monster

On Wednesday, March 14, 2018 at 10:38:55 PM UTC-4, Oumati Asami wrote:
How does this circuit work?

This house has 3 phase power.

I was replacing a downlight and found it having two black, two neutral,
and one blue incoming wire.

If the light switch was on, the blue wire was energized.
If the ceiling fan was on, one of the incoming black wire was energized.

Why/how do both light and fan work when both are on?

incoming downlight
a) ================(black)------------------
b) ================(neutral)----------------
c) ----------------(blue)------------------

IDK why a house anywhere would have 3 phase power. But there is a wire for the light, a wire for the fan, two neutrals, so what's the issue?

On 15/03/2018 09:38, trader_4 wrote:
On Wednesday, March 14, 2018 at 10:38:55 PM UTC-4, Oumati Asami wrote:
How does this circuit work?

This house has 3 phase power.

I was replacing a downlight and found it having two black, two neutral,
and one blue incoming wire.

If the light switch was on, the blue wire was energized.
If the ceiling fan was on, one of the incoming black wire was energized.

Why/how do both light and fan work when both are on?

incoming downlight
a) ================(black)------------------
b) ================(GROUND)----------------
c) ----------------(blue)------------------

IDK why a house anywhere would have 3 phase power. But there is a wire for the light, a wire for the fan, two neutrals, so what's the issue?

Sorry, the diagram was wrong. I mistakenly labelled ground as neutral.
It is now corrected.

When both fan and light are on, both the blue and black wires are
energized.

On 15/03/2018 09:13, Uncle Monster wrote:
On Wednesday, March 14, 2018 at 9:38:55 PM UTC-5, Oumati Asami wrote:
How does this circuit work?

This house has 3 phase power.

I was replacing a downlight and found it having two black, two neutral,
and one blue incoming wire.

If the light switch was on, the blue wire was energized.
If the ceiling fan was on, one of the incoming black wire was energized.

Why/how do both light and fan work when both are on?

incoming downlight
a) ================(black)------------------
b) ================(neutral)----------------
c) ----------------(blue)------------------


Knowing which country you reside in would help. ^_^

[8~{} Uncle Electric Monster

I didn't think it matters. I'm in Myanmar if this helps.

On Thursday, March 15, 2018 at 6:09:18 AM UTC-4, Oumati Asami wrote:
On 15/03/2018 09:38, trader_4 wrote:
On Wednesday, March 14, 2018 at 10:38:55 PM UTC-4, Oumati Asami wrote:
How does this circuit work?

This house has 3 phase power.

I was replacing a downlight and found it having two black, two neutral,
and one blue incoming wire.

If the light switch was on, the blue wire was energized.
If the ceiling fan was on, one of the incoming black wire was energized.

Why/how do both light and fan work when both are on?

incoming downlight
a) ================(black)------------------
b) ================(GROUND)----------------
c) ----------------(blue)------------------

IDK why a house anywhere would have 3 phase power. But there is a wire for the light, a wire for the fan, two neutrals, so what's the issue?

Sorry, the diagram was wrong. I mistakenly labelled ground as neutral.
It is now corrected.

When both fan and light are on, both the blue and black wires are
energized.

So, again, you have a hot for the light, a hot for the fan and a neutral. What's the issue?

On 3/15/18 6:27 AM, trader_4 wrote:
On Thursday, March 15, 2018 at 6:09:18 AM UTC-4, Oumati Asami wrote:
On 15/03/2018 09:38, trader_4 wrote:
On Wednesday, March 14, 2018 at 10:38:55 PM UTC-4, Oumati Asami wrote:
How does this circuit work?

This house has 3 phase power.

I was replacing a downlight and found it having two black, two neutral,
and one blue incoming wire.

If the light switch was on, the blue wire was energized.
If the ceiling fan was on, one of the incoming black wire was energized.

Why/how do both light and fan work when both are on?

incoming downlight
a) ================(black)------------------
b) ================(GROUND)----------------
c) ----------------(blue)------------------

IDK why a house anywhere would have 3 phase power. But there is a wire for the light, a wire for the fan, two neutrals, so what's the issue?

Sorry, the diagram was wrong. I mistakenly labelled ground as neutral.
It is now corrected.

When both fan and light are on, both the blue and black wires are
energized.

So, again, you have a hot for the light, a hot for the fan and a neutral. What's the issue?

Is the equipment ground being used as the neutral? It must be
tied to the neutral
upstream somewhere. That's illegal at least in my world.

On Thursday, March 15, 2018 at 7:58:01 AM UTC-4, Dean Hoffman wrote:
On 3/15/18 6:27 AM, trader_4 wrote:
On Thursday, March 15, 2018 at 6:09:18 AM UTC-4, Oumati Asami wrote:
On 15/03/2018 09:38, trader_4 wrote:
On Wednesday, March 14, 2018 at 10:38:55 PM UTC-4, Oumati Asami wrote:
How does this circuit work?

This house has 3 phase power.

I was replacing a downlight and found it having two black, two neutral,
and one blue incoming wire.

If the light switch was on, the blue wire was energized.
If the ceiling fan was on, one of the incoming black wire was energized.

Why/how do both light and fan work when both are on?

incoming downlight
a) ================(black)------------------
b) ================(GROUND)----------------
c) ----------------(blue)------------------


first lets clarify your picture

does a represent TWO blacks wires and only one is energized when the fan is on? what about the other black wire? are the two black wires connected together?

does b represent TWO white? are they connected together?

and c looks like it is ONE blue wire that is on when the light is on?

On 03/15/2018 04:11 AM, Oumati Asami wrote:
On 15/03/2018 09:13, Uncle Monster wrote:
On Wednesday, March 14, 2018 at 9:38:55 PM UTC-5, Oumati Asami wrote:
How does this circuit work?

This house has 3 phase power.

I was replacing a downlight and found it having two black, two neutral,
and one blue incoming wire.

If the light switch was on, the blue wire was energized.
If the ceiling fan was on, one of the incoming black wire was energized.

Why/how do both light and fan work when both are on?

incoming downlight
a) ================(black)------------------
b) ================(neutral)----------------
c) ----------------(blue)------------------


Knowing which country you reside in would help. ^_^

[8~{} Uncle Electric Monster

I didn't think it matters. I'm in Myanmar if this helps.

Translating 'downlight' into common English is a start. I assume you are
talking about a switch rather than a small, recessed spotlight. Assuming
the switch is configured so both black and blue are hot in one position,
why wouldn't they both work?

Oumati Asami wrote:
How does this circuit work?
This house has 3 phase power.
I was replacing a downlight and found it having two black, two neutral,
and one blue incoming wire.
If the light switch was on, the blue wire was energized.
If the ceiling fan was on, one of the incoming black wire was energized.
Why/how do both light and fan work when both are on?

incoming downlight
a) ================(black)------------------
b) ================(neutral)----------------
c) ----------------(blue)------------------


Knowing which country you reside in would help. ^_^


I didn't think it matters. I'm in Myanmar if this helps.


Translating 'downlight' into common English is a start. I assume you are
talking about a switch rather than a small, recessed spotlight. Assuming
the switch is configured so both black and blue are hot in one position,
why wouldn't they both work?


..... it has a fan .. and a light.

https://www.1000bulbs.com/pdf/fanima...stallation.pdf

John T.

On Thursday, March 15, 2018 at 10:21:35 AM UTC-4, wrote:
Oumati Asami wrote:
How does this circuit work?
This house has 3 phase power.
I was replacing a downlight and found it having two black, two neutral,
and one blue incoming wire.
If the light switch was on, the blue wire was energized.
If the ceiling fan was on, one of the incoming black wire was energized.
Why/how do both light and fan work when both are on?

incoming downlight
a) ================(black)------------------
b) ================(neutral)----------------
c) ----------------(blue)------------------


Knowing which country you reside in would help. ^_^


I didn't think it matters. I'm in Myanmar if this helps.


Translating 'downlight' into common English is a start. I assume you are
talking about a switch rather than a small, recessed spotlight. Assuming
the switch is configured so both black and blue are hot in one position,
why wouldn't they both work?


.... it has a fan .. and a light.

https://www.1000bulbs.com/pdf/fanima...stallation.pdf

John T.

That's what I understood it to be too.
And it has more that enough wires to run both. All you need is two switched
hots, a neutral and ground. So, I still don't understand what the
question about how both the light and fan can work at the same time is
all about.
issue is.

On Wednesday, March 14, 2018 at 11:09:04 PM UTC-4, trader_4 wrote:
IDK why a house anywhere would have 3 phase power.?

I can answer that for one location.

In a housing development at what is essentially a campus, we fed 3 phase power to individual houses because of going to 208V airconditioners. I think we got a better price on a bulk buy of the units.

What we found is that everybody complained their dryers didn't work right and their ovens took too long to warm up. Their appliances expected 240.

In TimR writes:

In a housing development at what is essentially a campus, we fed 3 phase power to individual houses because of going to 208V airconditioners. I think we got a better price on a bulk buy of the units.

What we found is that everybody complained their dryers didn't work right and their ovens took too long to warm up. Their appliances expected 240.

For a straight thermal load like an over or dryer, that drop
from 240 to 208 is actually pretty messy.

At first glance you'd think that 208/240 = 0.8666.., or about 13 pct,
so to first approximations 13 pct longer to heat up.

However, wattage is amperage times voltage. And both of these [a]
are dropping by that 13 pct.

So the final wattage is.. 0.86... times 0.86... = 0.73.

So more than 25 percent longer.

[a] neglecting the very real issue that in many of these
items the resistance changes with temperatur...

As a side note, we installed a "240v" air conditioner i
a NYC building that had three phase, so it was being fed
at the equivlanet of 208.

We very specifically asked the sales rep AND the manufacturer
if this would be a problem. They said it was fine.

It wasn't.


--
__________________________________________________ ___
Knowledge may be power, but communications is the key

[to foil spammers, my address has been double rot-13 encoded]

On Thursday, March 15, 2018 at 11:06:47 AM UTC-4, TimR wrote:
On Wednesday, March 14, 2018 at 11:09:04 PM UTC-4, trader_4 wrote:
IDK why a house anywhere would have 3 phase power.?

I can answer that for one location.

In a housing development at what is essentially a campus, we fed 3 phase power to individual houses because of going to 208V airconditioners. I think we got a better price on a bulk buy of the units.

What we found is that everybody complained their dryers didn't work right and their ovens took too long to warm up. Their appliances expected 240.

Wow, that's amazing. Hard to imagine that a price difference on AC
units would push anyone to use 3 phase in a new development, especially
given that as you point out, you then have issues with the 240V
appliances a typical house has. You'd think the power company would
say, "what, are you nuts?" too. But it does go to show you that you
can find something odd somewhere.

[lots snippeth]

IDK why a house anywhere would have 3 phase power.?

I can answer that for one location.

In a housing development at what is essentially a campus, we fed 3 phase power to individual houses because of going to 208V airconditioners. I think we got a better price on a bulk buy of the units.

What we found is that everybody complained their dryers didn't work right and their ovens took too long to warm up. Their appliances expected 240.

Wow, that's amazing. Hard to imagine that a price difference on AC
units would push anyone to use 3 phase in a new development, especially
given that as you point out, you then have issues with the 240V
appliances a typical house has.

In the NYC area it's common for both houses and apartments
in, well, apartment buildings, to be wired up this way.

The transformer has three hot legsplus neutral tapped off
of it. A hot - neutral (which is what a typical outlet
would have) yields 120VAC.

A hot - hot, which would be used for larger air conditiers,
a clothes dryer, and maybe an electric stove, would yield
the equivalent of 208.

So... each apartment (or house) would get two hots out of
the three, and a neutral

Apartment #1 would have "hot" "a" and "b", apt #2 would
have "b" and "c", apt #3 would have "a" and "c".

Rinse, lather, repeat.

All three hots, i.e. all three phases, would run to
the elevator motor and a rooftop air conditioner.

Note that there are other ways of wiring the transformers
so that hot - hot gives a true 240, but that isn't
the case in lots of the NYC area.




--
__________________________________________________ ___
Knowledge may be power, but communications is the key

[to foil spammers, my address has been double rot-13 encoded]

On Thursday, March 15, 2018 at 12:10:43 PM UTC-4, danny burstein wrote:
[lots snippeth]

IDK why a house anywhere would have 3 phase power.?

I can answer that for one location.

In a housing development at what is essentially a campus, we fed 3 phase power to individual houses because of going to 208V airconditioners. I think we got a better price on a bulk buy of the units.

What we found is that everybody complained their dryers didn't work right and their ovens took too long to warm up. Their appliances expected 240.

Wow, that's amazing. Hard to imagine that a price difference on AC
units would push anyone to use 3 phase in a new development, especially
given that as you point out, you then have issues with the 240V
appliances a typical house has.

In the NYC area it's common for both houses and apartments
in, well, apartment buildings, to be wired up this way.

The transformer has three hot legsplus neutral tapped off
of it. A hot - neutral (which is what a typical outlet
would have) yields 120VAC.

A hot - hot, which would be used for larger air conditiers,
a clothes dryer, and maybe an electric stove, would yield
the equivalent of 208.

So... each apartment (or house) would get two hots out of
the three, and a neutral

Apartment #1 would have "hot" "a" and "b", apt #2 would
have "b" and "c", apt #3 would have "a" and "c".

Rinse, lather, repeat.

All three hots, i.e. all three phases, would run to
the elevator motor and a rooftop air conditioner.


I can see that making sense in apartment buildings in the city,
where you need 3 phase for heavy eqpt in the common areas of the
building. I'm in NJ and have never seen it in homes here, it's
all split-phase to homes. And the big disadvantage to using 208
as you point out is that it only delivers 73% of the power that
you'd get at 240V. I hate waiting for my over to heat up even
with 240.

On Thu, 15 Mar 2018 16:10:39 +0000 (UTC), danny burstein
wrote:

[lots snippeth]

IDK why a house anywhere would have 3 phase power.?

I can answer that for one location.

In a housing development at what is essentially a campus, we fed 3 phase power to individual houses because of going to 208V airconditioners. I think we got a better price on a bulk buy of the units.

What we found is that everybody complained their dryers didn't work right and their ovens took too long to warm up. Their appliances expected 240.

Wow, that's amazing. Hard to imagine that a price difference on AC
units would push anyone to use 3 phase in a new development, especially
given that as you point out, you then have issues with the 240V
appliances a typical house has.

In the NYC area it's common for both houses and apartments
in, well, apartment buildings, to be wired up this way.

The transformer has three hot legsplus neutral tapped off
of it. A hot - neutral (which is what a typical outlet
would have) yields 120VAC.

A hot - hot, which would be used for larger air conditiers,
a clothes dryer, and maybe an electric stove, would yield
the equivalent of 208.

So... each apartment (or house) would get two hots out of
the three, and a neutral

Apartment #1 would have "hot" "a" and "b", apt #2 would
have "b" and "c", apt #3 would have "a" and "c".

Rinse, lather, repeat.

All three hots, i.e. all three phases, would run to
the elevator motor and a rooftop air conditioner.

Note that there are other ways of wiring the transformers
so that hot - hot gives a true 240, but that isn't
the case in lots of the NYC area.


Without using another transformer, getting 240 instead of 208 for the
high voltage, or line to line loads, means the low voltage, or line to
neutral loads get something like 177 - too much for "non-universal"
devices and light bulbs, at any rate.

The phase angle mandates that.

If line to line is set at 240 and an additional transformer is
employed (can even be a simple center tapped autotransformer to
provide the "central" neutral) then everything works as designed -
with 120 line to neutral. The center leg of the autotransformer needs
to be grounded for safety.

On Thursday, March 15, 2018 at 5:11:36 AM UTC-5, Oumati Asami wrote:
On 15/03/2018 09:13, Uncle Monster wrote:
On Wednesday, March 14, 2018 at 9:38:55 PM UTC-5, Oumati Asami wrote:
How does this circuit work?

This house has 3 phase power.

I was replacing a downlight and found it having two black, two neutral,
and one blue incoming wire.

If the light switch was on, the blue wire was energized.
If the ceiling fan was on, one of the incoming black wire was energized.

Why/how do both light and fan work when both are on?

incoming downlight
a) ================(black)------------------
b) ================(neutral)----------------
c) ----------------(blue)------------------

Knowing which country you reside in would help. ^_^

[8~{} Uncle Electric Monster

I didn't think it matters. I'm in Myanmar if this helps.


I'm guessing the normal power supplied to your electrical outlets and light fixtures is 250vac 50hz. Most folks who post here are in North America where the power supplied to regular electrical outlets and light fixtures is 120vac 60hz. Larger appliances will use 240vac. I had an instructor once tell the class,"Electrons are electrons." Meaning electrons are going to go where they want so you better guide them.^_^

[8~{} Uncle Electrical Monster

On 3/15/2018 11:36 AM, danny burstein wrote:
In TimR writes:

In a housing development at what is essentially a campus, we fed 3 phase power to individual houses because of going to 208V airconditioners. I think we got a better price on a bulk buy of the units.

What we found is that everybody complained their dryers didn't work right and their ovens took too long to warm up. Their appliances expected 240.

For a straight thermal load like an over or dryer, that drop
from 240 to 208 is actually pretty messy.

At first glance you'd think that 208/240 = 0.8666.., or about 13 pct,
so to first approximations 13 pct longer to heat up.

However, wattage is amperage times voltage. And both of these [a]
are dropping by that 13 pct.

So the final wattage is.. 0.86... times 0.86... = 0.73.

So more than 25 percent longer.

[a] neglecting the very real issue that in many of these
items the resistance changes with temperatur...

As a side note, we installed a "240v" air conditioner i
a NYC building that had three phase, so it was being fed
at the equivlanet of 208.

We very specifically asked the sales rep AND the manufacturer
if this would be a problem. They said it was fine.

It wasn't.


https://www.larsonelectronics.com/p-...ps-5060hz.aspx

In Congoleum Breckenridge writes:

On 3/15/2018 11:36 AM, danny burstein wrote:

As a side note, we installed a "240v" air conditioner in
a NYC building that had three phase, so it was being fed
at the equivlanet of 208.

We very specifically asked the sales rep AND the manufacturer
if this would be a problem. They said it was fine.

It wasn't.


https://www.larsonelectronics.com/p-...ps-5060hz.aspx

Now, *now*, you tell us...

Where were you 15 years ago?


--
__________________________________________________ ___
Knowledge may be power, but communications is the key

[to foil spammers, my address has been double rot-13 encoded]

On Thu, 15 Mar 2018 13:57:43 -0700 (PDT), Uncle Monster
wrote:

On Thursday, March 15, 2018 at 5:11:36 AM UTC-5, Oumati Asami wrote:
On 15/03/2018 09:13, Uncle Monster wrote:
On Wednesday, March 14, 2018 at 9:38:55 PM UTC-5, Oumati Asami wrote:
How does this circuit work?

This house has 3 phase power.

I was replacing a downlight and found it having two black, two neutral,
and one blue incoming wire.

If the light switch was on, the blue wire was energized.
If the ceiling fan was on, one of the incoming black wire was energized.

Why/how do both light and fan work when both are on?

incoming downlight
a) ================(black)------------------
b) ================(neutral)----------------
c) ----------------(blue)------------------

Knowing which country you reside in would help. ^_^

[8~{} Uncle Electric Monster

I didn't think it matters. I'm in Myanmar if this helps.


I'm guessing the normal power supplied to your electrical outlets and light fixtures is 250vac 50hz.
Most folks who post here are in North America where the power supplied to regular electrical outlets
and light fixtures is 120vac 60hz. Larger appliances will use 240vac.
I had an instructor once tell the class,"Electrons are electrons."
Meaning electrons are going to go where they want so you better guide them.^_^
[8~{} Uncle Electrical Monster



http://treehouse.ofb.net/go/en/voltage/Myanmar

On Thu, 15 Mar 2018 08:51:04 -0700 (PDT), trader_4
wrote:

On Thursday, March 15, 2018 at 11:06:47 AM UTC-4, TimR wrote:
On Wednesday, March 14, 2018 at 11:09:04 PM UTC-4, trader_4 wrote:
IDK why a house anywhere would have 3 phase power.?

I can answer that for one location.

In a housing development at what is essentially a campus, we fed 3 phase power to individual houses because of going to 208V airconditioners. I think we got a better price on a bulk buy of the units.

What we found is that everybody complained their dryers didn't work right and their ovens took too long to warm up. Their appliances expected 240.

Wow, that's amazing. Hard to imagine that a price difference on AC
units would push anyone to use 3 phase in a new development, especially
given that as you point out, you then have issues with the 240V
appliances a typical house has. You'd think the power company would
say, "what, are you nuts?" too. But it does go to show you that you
can find something odd somewhere.

If they really wanted 3p equipment, they should have ordered 3p center
tapped delta. Then they would still have 120/240 available. This is
actually fairly common in mixed use industrial bays.

On Thu, 15 Mar 2018 16:33:11 -0400, Clare Snyder
wrote:

On Thu, 15 Mar 2018 16:10:39 +0000 (UTC), danny burstein
wrote:

[lots snippeth]

IDK why a house anywhere would have 3 phase power.?

I can answer that for one location.

In a housing development at what is essentially a campus, we fed 3 phase power to individual houses because of going to 208V airconditioners. I think we got a better price on a bulk buy of the units.

What we found is that everybody complained their dryers didn't work right and their ovens took too long to warm up. Their appliances expected 240.

Wow, that's amazing. Hard to imagine that a price difference on AC
units would push anyone to use 3 phase in a new development, especially
given that as you point out, you then have issues with the 240V
appliances a typical house has.

In the NYC area it's common for both houses and apartments
in, well, apartment buildings, to be wired up this way.

The transformer has three hot legsplus neutral tapped off
of it. A hot - neutral (which is what a typical outlet
would have) yields 120VAC.

A hot - hot, which would be used for larger air conditiers,
a clothes dryer, and maybe an electric stove, would yield
the equivalent of 208.

So... each apartment (or house) would get two hots out of
the three, and a neutral

Apartment #1 would have "hot" "a" and "b", apt #2 would
have "b" and "c", apt #3 would have "a" and "c".

Rinse, lather, repeat.

All three hots, i.e. all three phases, would run to
the elevator motor and a rooftop air conditioner.

Note that there are other ways of wiring the transformers
so that hot - hot gives a true 240, but that isn't
the case in lots of the NYC area.


Without using another transformer, getting 240 instead of 208 for the
high voltage, or line to line loads, means the low voltage, or line to
neutral loads get something like 177 - too much for "non-universal"
devices and light bulbs, at any rate.

The phase angle mandates that.

If line to line is set at 240 and an additional transformer is
employed (can even be a simple center tapped autotransformer to
provide the "central" neutral) then everything works as designed -
with 120 line to neutral. The center leg of the autotransformer needs
to be grounded for safety.

If you want 3p and 120/240 you use center tapped delta and the PoCo
can do that with 2 transformers instead of the 3 they need for 3p wye.

On Thursday, March 15, 2018 at 7:25:32 PM UTC-5, wrote:
On Thu, 15 Mar 2018 08:51:04 -0700 (PDT), trader_4
wrote:

On Thursday, March 15, 2018 at 11:06:47 AM UTC-4, TimR wrote:
On Wednesday, March 14, 2018 at 11:09:04 PM UTC-4, trader_4 wrote:
IDK why a house anywhere would have 3 phase power.?

I can answer that for one location.

In a housing development at what is essentially a campus, we fed 3 phase power to individual houses because of going to 208V airconditioners. I think we got a better price on a bulk buy of the units.

What we found is that everybody complained their dryers didn't work right and their ovens took too long to warm up. Their appliances expected 240.

On 15/03/2018 17:57, trader_4 wrote:
On Thursday, March 15, 2018 at 6:09:18 AM UTC-4, Oumati Asami wrote:
On 15/03/2018 09:38, trader_4 wrote:
On Wednesday, March 14, 2018 at 10:38:55 PM UTC-4, Oumati Asami wrote:
How does this circuit work?

This house has 3 phase power.

I was replacing a downlight and found it having two black, two neutral,
and one blue incoming wire.

If the light switch was on, the blue wire was energized.
If the ceiling fan was on, one of the incoming black wire was energized.

Why/how do both light and fan work when both are on?

incoming downlight
a) ================(black)------------------
b) ================(GROUND)----------------
c) ----------------(blue)------------------

IDK why a house anywhere would have 3 phase power. But there is a wire for the light, a wire for the fan, two neutrals, so what's the issue?

Sorry, the diagram was wrong. I mistakenly labelled ground as neutral.
It is now corrected.

When both fan and light are on, both the blue and black wires are
energized.

So, again, you have a hot for the light, a hot for the fan and a neutral. What's the issue?

When both fan and light are on, there are two hots. Where is the neutral?

On 15/03/2018 18:27, Dean Hoffman wrote:
On 3/15/18 6:27 AM, trader_4 wrote:
On Thursday, March 15, 2018 at 6:09:18 AM UTC-4, Oumati Asami wrote:
On 15/03/2018 09:38, trader_4 wrote:
On Wednesday, March 14, 2018 at 10:38:55 PM UTC-4, Oumati Asami wrote:
How does this circuit work?

This house has 3 phase power.

I was replacing a downlight and found it having two black, two
neutral,
and one blue incoming wire.

If the light switch was on, the blue wire was energized.
If the ceiling fan was on, one of the incoming black wire was
energized.

Why/how do both light and fan work when both are on?

Â*Â*Â*Â*Â*Â*Â*Â* incomingÂ*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* downlight
a) ================(black)------------------
b) ================(GROUND)----------------
c) ----------------(blue)------------------

IDK why a house anywhere would have 3 phase power. But there is a
wire for the light, a wire for the fan, two neutrals, so what's the
issue?

Sorry, the diagram was wrong. I mistakenly labelled ground as neutral.
It is now corrected.

When both fan and light are on, both the blue and black wires are
energized.

So, again, you have a hot for the light, a hot for the fan and a
neutral. What's the issue?

Â*Â*Â*Â*Â* Is the equipment ground being used as the neutral?Â* It must be
tied to the neutral
upstream somewhere.Â*Â*Â* That's illegal at least in my world.

How do I test if ground is used as neutral?

The main breaker is a GFIC. I have experienced unexplained tripping.
Would that have anything to do with ground being used as neutral?

On 15/03/2018 19:22, wrote:
On Thursday, March 15, 2018 at 7:58:01 AM UTC-4, Dean Hoffman wrote:
On 3/15/18 6:27 AM, trader_4 wrote:
On Thursday, March 15, 2018 at 6:09:18 AM UTC-4, Oumati Asami wrote:
On 15/03/2018 09:38, trader_4 wrote:
On Wednesday, March 14, 2018 at 10:38:55 PM UTC-4, Oumati Asami wrote:
How does this circuit work?

This house has 3 phase power.

I was replacing a downlight and found it having two black, two neutral,
and one blue incoming wire.

If the light switch was on, the blue wire was energized.
If the ceiling fan was on, one of the incoming black wire was energized.

Why/how do both light and fan work when both are on?

incoming downlight
a) ================(black)------------------
b) ================(GROUND)----------------
c) ----------------(blue)------------------


first lets clarify your picture

does a represent TWO blacks wires and only one is energized when the fan is on? what about the other black wire? are the two black wires connected together?

does b represent TWO white? are they connected together?

and c looks like it is ONE blue wire that is on when the light is on?

Yes. Only one black is energized when fan is on. The two black wires are
connected together. The parentheses represent a connector. It is like
[]=[]=[] where wires go into the [] from top and bottom
(https://uae.souq.com/ae-en/mega-pvc-...70-7557028/i/).
To put the connector into the top diagram, turn the connector ([]=[]=[])
90 degrees. So, from left to right is a, b, and c.

In this part of the world, ground is yellow/green. They are connected
together.

There is only one blue wire and it is on when light is on.

So, when both fan and light are on, both a and c are energized.

On Thursday, March 15, 2018 at 10:10:11 PM UTC-4, Oumati Asami wrote:
On 15/03/2018 17:57, trader_4 wrote:
On Thursday, March 15, 2018 at 6:09:18 AM UTC-4, Oumati Asami wrote:
On 15/03/2018 09:38, trader_4 wrote:
On Wednesday, March 14, 2018 at 10:38:55 PM UTC-4, Oumati Asami wrote:
How does this circuit work?

This house has 3 phase power.

I was replacing a downlight and found it having two black, two neutral,
and one blue incoming wire.

If the light switch was on, the blue wire was energized.
If the ceiling fan was on, one of the incoming black wire was energized.

Why/how do both light and fan work when both are on?

incoming downlight
a) ================(black)------------------
b) ================(GROUND)----------------
c) ----------------(blue)------------------

IDK why a house anywhere would have 3 phase power. But there is a wire for the light, a wire for the fan, two neutrals, so what's the issue?

Sorry, the diagram was wrong. I mistakenly labelled ground as neutral.
It is now corrected.

When both fan and light are on, both the blue and black wires are
energized.

So, again, you have a hot for the light, a hot for the fan and a neutral. What's the issue?

When both fan and light are on, there are two hots. Where is the neutral?

Same place it's always been? You said there was a neutral.

On 16/03/2018 09:08, trader_4 wrote:
On Thursday, March 15, 2018 at 10:10:11 PM UTC-4, Oumati Asami wrote:
On 15/03/2018 17:57, trader_4 wrote:
On Thursday, March 15, 2018 at 6:09:18 AM UTC-4, Oumati Asami wrote:
On 15/03/2018 09:38, trader_4 wrote:
On Wednesday, March 14, 2018 at 10:38:55 PM UTC-4, Oumati Asami wrote:
How does this circuit work?

This house has 3 phase power.

I was replacing a downlight and found it having two black, two neutral,
and one blue incoming wire.

If the light switch was on, the blue wire was energized.
If the ceiling fan was on, one of the incoming black wire was energized.

Why/how do both light and fan work when both are on?

incoming downlight
a) ================(black)------------------
b) ================(GROUND)----------------
c) ----------------(blue)------------------

IDK why a house anywhere would have 3 phase power. But there is a wire for the light, a wire for the fan, two neutrals, so what's the issue?

Sorry, the diagram was wrong. I mistakenly labelled ground as neutral.
It is now corrected.

When both fan and light are on, both the blue and black wires are
energized.

So, again, you have a hot for the light, a hot for the fan and a neutral. What's the issue?

When both fan and light are on, there are two hots. Where is the neutral?

Same place it's always been? You said there was a neutral.

Sorry. I made a mistake in the original post. The neutral in the
original should be ground. There is a blue wire, hot when light is on,
two ground wires, and two black wires, one of them hot when fan is on.
Please see the corrected diagram above.

The light is a ceiling recess light, not one on the ceiling fan.

On 16/03/2018 03:27, Uncle Monster wrote:
On Thursday, March 15, 2018 at 5:11:36 AM UTC-5, Oumati Asami wrote:
On 15/03/2018 09:13, Uncle Monster wrote:
On Wednesday, March 14, 2018 at 9:38:55 PM UTC-5, Oumati Asami wrote:
How does this circuit work?

This house has 3 phase power.

I was replacing a downlight and found it having two black, two neutral,
and one blue incoming wire.

If the light switch was on, the blue wire was energized.
If the ceiling fan was on, one of the incoming black wire was energized.

Why/how do both light and fan work when both are on?

incoming downlight
a) ================(black)------------------
b) ================(neutral)----------------
c) ----------------(blue)------------------

Knowing which country you reside in would help. ^_^

[8~{} Uncle Electric Monster

I didn't think it matters. I'm in Myanmar if this helps.


I'm guessing the normal power supplied to your electrical outlets and light fixtures is 250vac 50hz. Most folks who post here are in North America where the power supplied to regular electrical outlets and light fixtures is 120vac 60hz. Larger appliances will use 240vac. I had an instructor once tell the class,"Electrons are electrons." Meaning electrons are going to go where they want so you better guide them.^_^

[8~{} Uncle Electrical Monster

I think it is 230 v though I did not test.

On 03/15/2018 08:23 AM, wrote:
Oumati Asami wrote:
How does this circuit work?
This house has 3 phase power.
I was replacing a downlight and found it having two black, two neutral,
and one blue incoming wire.
If the light switch was on, the blue wire was energized.
If the ceiling fan was on, one of the incoming black wire was energized.
Why/how do both light and fan work when both are on?

incoming downlight
a) ================(black)------------------
b) ================(neutral)----------------
c) ----------------(blue)------------------


Knowing which country you reside in would help. ^_^


I didn't think it matters. I'm in Myanmar if this helps.


Translating 'downlight' into common English is a start. I assume you are
talking about a switch rather than a small, recessed spotlight. Assuming
the switch is configured so both black and blue are hot in one position,
why wouldn't they both work?


.... it has a fan .. and a light.

https://www.1000bulbs.com/pdf/fanima...stallation.pdf

Learn something every day... That wiring diagram just has the standard
black/white/ground though.

On 15/03/2018 21:02, trader_4 wrote:
On Thursday, March 15, 2018 at 10:21:35 AM UTC-4, wrote:
Oumati Asami wrote:
How does this circuit work?
This house has 3 phase power.
I was replacing a downlight and found it having two black, two neutral,
and one blue incoming wire.
If the light switch was on, the blue wire was energized.
If the ceiling fan was on, one of the incoming black wire was energized.
Why/how do both light and fan work when both are on?

incoming downlight
a) ================(black)------------------
b) ================(neutral)----------------
c) ----------------(blue)------------------


Knowing which country you reside in would help. ^_^


I didn't think it matters. I'm in Myanmar if this helps.


Translating 'downlight' into common English is a start. I assume you are
talking about a switch rather than a small, recessed spotlight. Assuming
the switch is configured so both black and blue are hot in one position,
why wouldn't they both work?


.... it has a fan .. and a light.

https://www.1000bulbs.com/pdf/fanima...stallation.pdf

John T.

That's what I understood it to be too.
And it has more that enough wires to run both. All you need is two switched
hots, a neutral and ground. So, I still don't understand what the
question about how both the light and fan can work at the same time is
all about.
issue is.


The light is a recessed down light on the ceiling. Sorry. When I post,
it did not occur to me that some ceiling fans had built-in lights.

On 15/03/2018 20:27, rbowman wrote:
On 03/15/2018 04:11 AM, Oumati Asami wrote:
On 15/03/2018 09:13, Uncle Monster wrote:
On Wednesday, March 14, 2018 at 9:38:55 PM UTC-5, Oumati Asami wrote:
How does this circuit work?

This house has 3 phase power.

I was replacing a downlight and found it having two black, two neutral,
and one blue incoming wire.

If the light switch was on, the blue wire was energized.
If the ceiling fan was on, one of the incoming black wire was
energized.

Why/how do both light and fan work when both are on?

Â*Â*Â*Â*Â*Â*Â* incomingÂ*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* downlight
a) ================(black)------------------
b) ================(neutral)----------------
c) ----------------(blue)------------------


Knowing which country you reside in would help. ^_^

[8~{} Uncle Electric Monster

I didn't think it matters. I'm in Myanmar if this helps.

Translating 'downlight' into common English is a start. I assume you are
talking about a switch rather than a small, recessed spotlight. Assuming
the switch is configured so both black and blue are hot in one position,
why wouldn't they both work?

It is a recessed ceiling light and it is separated from the fan. It is
not part of the fan.

On 15/03/2018 18:27, Dean Hoffman wrote:
On 3/15/18 6:27 AM, trader_4 wrote:
On Thursday, March 15, 2018 at 6:09:18 AM UTC-4, Oumati Asami wrote:
On 15/03/2018 09:38, trader_4 wrote:
On Wednesday, March 14, 2018 at 10:38:55 PM UTC-4, Oumati Asami wrote:
How does this circuit work?

This house has 3 phase power.

I was replacing a downlight and found it having two black, two
neutral,
and one blue incoming wire.

If the light switch was on, the blue wire was energized.
If the ceiling fan was on, one of the incoming black wire was
energized.

Why/how do both light and fan work when both are on?

Â*Â*Â*Â*Â*Â*Â*Â* incomingÂ*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* downlight
a) ================(black)------------------
b) ================(GROUND)----------------
c) ----------------(blue)------------------

IDK why a house anywhere would have 3 phase power. But there is a
wire for the light, a wire for the fan, two neutrals, so what's the
issue?

Sorry, the diagram was wrong. I mistakenly labelled ground as neutral.
It is now corrected.

When both fan and light are on, both the blue and black wires are
energized.

So, again, you have a hot for the light, a hot for the fan and a
neutral. What's the issue?

Â*Â*Â*Â*Â* Is the equipment ground being used as the neutral?Â* It must be
tied to the neutral
upstream somewhere.Â*Â*Â* That's illegal at least in my world.

It never occurs to me that people would use ground as neutral. Would
that make the fixture energized when on? I just tested the light
fixture, it was not energized when light was on, nor when both were on.

On Thursday, March 15, 2018 at 10:43:03 PM UTC-4, Oumati Asami wrote:
On 16/03/2018 09:08, trader_4 wrote:
On Thursday, March 15, 2018 at 10:10:11 PM UTC-4, Oumati Asami wrote:
On 15/03/2018 17:57, trader_4 wrote:
On Thursday, March 15, 2018 at 6:09:18 AM UTC-4, Oumati Asami wrote:
On 15/03/2018 09:38, trader_4 wrote:
On Wednesday, March 14, 2018 at 10:38:55 PM UTC-4, Oumati Asami wrote:
How does this circuit work?

This house has 3 phase power.

I was replacing a downlight and found it having two black, two neutral,
and one blue incoming wire.

If the light switch was on, the blue wire was energized.
If the ceiling fan was on, one of the incoming black wire was energized.

Why/how do both light and fan work when both are on?

incoming downlight
a) ================(black)------------------
b) ================(GROUND)----------------
c) ----------------(blue)------------------

IDK why a house anywhere would have 3 phase power. But there is a wire for the light, a wire for the fan, two neutrals, so what's the issue?

Sorry, the diagram was wrong. I mistakenly labelled ground as neutral.
It is now corrected.

When both fan and light are on, both the blue and black wires are
energized.

So, again, you have a hot for the light, a hot for the fan and a neutral. What's the issue?

When both fan and light are on, there are two hots. Where is the neutral?

Same place it's always been? You said there was a neutral.

Sorry. I made a mistake in the original post. The neutral in the
original should be ground. There is a blue wire, hot when light is on,
two ground wires, and two black wires, one of them hot when fan is on.
Please see the corrected diagram above.

The light is a ceiling recess light, not one on the ceiling fan.

The ground wire should be connected to the metal frame of the fan and light.. The fan and light have a hot on one side and the other side is the neutral. Like someone else said, if that wire is another green/yellow then it is serving as the neutral and should be marked as that. Whether it is correctly run and terminated on the other end, who knows.

On Thursday, March 15, 2018 at 11:06:00 PM UTC-4, Oumati Asami wrote:
On 15/03/2018 18:27, Dean Hoffman wrote:
On 3/15/18 6:27 AM, trader_4 wrote:
On Thursday, March 15, 2018 at 6:09:18 AM UTC-4, Oumati Asami wrote:
On 15/03/2018 09:38, trader_4 wrote:
On Wednesday, March 14, 2018 at 10:38:55 PM UTC-4, Oumati Asami wrote:
How does this circuit work?

This house has 3 phase power.

I was replacing a downlight and found it having two black, two
neutral,
and one blue incoming wire.

If the light switch was on, the blue wire was energized.
If the ceiling fan was on, one of the incoming black wire was
energized.

Why/how do both light and fan work when both are on?

Â*Â*Â*Â*Â*Â*Â*Â* incomingÂ*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* downlight
a) ================(black)------------------
b) ================(GROUND)----------------
c) ----------------(blue)------------------

IDK why a house anywhere would have 3 phase power. But there is a
wire for the light, a wire for the fan, two neutrals, so what's the
issue?

Sorry, the diagram was wrong. I mistakenly labelled ground as neutral..
It is now corrected.

When both fan and light are on, both the blue and black wires are
energized.

So, again, you have a hot for the light, a hot for the fan and a
neutral. What's the issue?

Â*Â*Â*Â*Â* Is the equipment ground being used as the neutral?Â* It must be
tied to the neutral
upstream somewhere.Â*Â*Â* That's illegal at least in my world.

It never occurs to me that people would use ground as neutral. Would
that make the fixture energized when on? I just tested the light
fixture, it was not energized when light was on, nor when both were on.

The fixture would not be energized as long as the wire is connected all the way back to the panel and connected to the neutral there. But if it got disconnected, the light and fan would not function and the metal would be energized. Which is why it's not allowed by code for that kind of circuit here in USA at least.

On Thursday, March 15, 2018 at 9:45:19 PM UTC-5, Oumati Asami wrote:
On 16/03/2018 03:27, Uncle Monster wrote:
On Thursday, March 15, 2018 at 5:11:36 AM UTC-5, Oumati Asami wrote:
On 15/03/2018 09:13, Uncle Monster wrote:
On Wednesday, March 14, 2018 at 9:38:55 PM UTC-5, Oumati Asami wrote:
How does this circuit work?

This house has 3 phase power.

I was replacing a downlight and found it having two black, two neutral,
and one blue incoming wire.

If the light switch was on, the blue wire was energized.
If the ceiling fan was on, one of the incoming black wire was energized.

Why/how do both light and fan work when both are on?

incoming downlight
a) ================(black)------------------
b) ================(neutral)----------------
c) ----------------(blue)------------------

Knowing which country you reside in would help. ^_^

[8~{} Uncle Electric Monster

I didn't think it matters. I'm in Myanmar if this helps.


I'm guessing the normal power supplied to your electrical outlets and light fixtures is 250vac 50hz. Most folks who post here are in North America where the power supplied to regular electrical outlets and light fixtures is 120vac 60hz. Larger appliances will use 240vac. I had an instructor once tell the class,"Electrons are electrons." Meaning electrons are going to go where they want so you better guide them.^_^

[8~{} Uncle Electrical Monster

I think it is 230 v though I did not test.

I believe someone posted a link showing that it's 230vac 50hz used in your country. I found it. ^_^

http://treehouse.ofb.net/go/en/voltage/Myanmar

I imagine the wire colors are different and wire sizes are much smaller than what is used in North America. I did some modifications to some portable housing units manufactured in Australia and the wiring was stranded where the wire used here is normally solid for use in wiring run to light fixtures and electrical outlets. The question I have is, does the power supplied to your lighting circuits and electrical outlets read 230vac from hot to neutral/ground? Is there a pair of hot wires at each outlet or is there just one hot wire? ^_^

[8~{} Uncle Curious Monster

On 16/03/2018 12:05, Uncle Monster wrote:
On Thursday, March 15, 2018 at 9:45:19 PM UTC-5, Oumati Asami wrote:
On 16/03/2018 03:27, Uncle Monster wrote:
On Thursday, March 15, 2018 at 5:11:36 AM UTC-5, Oumati Asami wrote:
On 15/03/2018 09:13, Uncle Monster wrote:
On Wednesday, March 14, 2018 at 9:38:55 PM UTC-5, Oumati Asami wrote:
How does this circuit work?

This house has 3 phase power.

I was replacing a downlight and found it having two black, two neutral,
and one blue incoming wire.

If the light switch was on, the blue wire was energized.
If the ceiling fan was on, one of the incoming black wire was energized.

Why/how do both light and fan work when both are on?

incoming downlight
a) ================(black)------------------
b) ================(neutral)----------------
c) ----------------(blue)------------------

Knowing which country you reside in would help. ^_^

[8~{} Uncle Electric Monster

I didn't think it matters. I'm in Myanmar if this helps.


I'm guessing the normal power supplied to your electrical outlets and light fixtures is 250vac 50hz. Most folks who post here are in North America where the power supplied to regular electrical outlets and light fixtures is 120vac 60hz. Larger appliances will use 240vac. I had an instructor once tell the class,"Electrons are electrons." Meaning electrons are going to go where they want so you better guide them.^_^

[8~{} Uncle Electrical Monster

I think it is 230 v though I did not test.

I believe someone posted a link showing that it's 230vac 50hz used in your country. I found it. ^_^

http://treehouse.ofb.net/go/en/voltage/Myanmar

I imagine the wire colors are different and wire sizes are much smaller than what is used in North America. I did some modifications to some portable housing units manufactured in Australia and the wiring was stranded where the wire used here is normally solid for use in wiring run to light fixtures and electrical outlets. The question I have is, does the power supplied to your lighting circuits and electrical outlets read 230vac from hot to neutral/ground? Is there a pair of hot wires at each outlet or is there just one hot wire? ^_^

[8~{} Uncle Curious Monster


I had checked several outlets before and found them containing three
wires (LNG) and being 230 V. I did not check the particular light and
fan in question. I think they are 230 V also.

At first, I thought maybe the fan shared the neutral with the light. But
what happens when both light and fan are on?

On Friday, March 16, 2018 at 2:23:03 AM UTC-5, Oumati Asami wrote:
On 16/03/2018 12:05, Uncle Monster wrote:
On Thursday, March 15, 2018 at 9:45:19 PM UTC-5, Oumati Asami wrote:
On 16/03/2018 03:27, Uncle Monster wrote:
On Thursday, March 15, 2018 at 5:11:36 AM UTC-5, Oumati Asami wrote:
On 15/03/2018 09:13, Uncle Monster wrote:
On Wednesday, March 14, 2018 at 9:38:55 PM UTC-5, Oumati Asami wrote:
How does this circuit work?

This house has 3 phase power.

I was replacing a downlight and found it having two black, two neutral,
and one blue incoming wire.

If the light switch was on, the blue wire was energized.
If the ceiling fan was on, one of the incoming black wire was energized.

Why/how do both light and fan work when both are on?

incoming downlight
a) ================(black)------------------
b) ================(neutral)----------------
c) ----------------(blue)------------------

Knowing which country you reside in would help. ^_^

[8~{} Uncle Electric Monster

I didn't think it matters. I'm in Myanmar if this helps.


I'm guessing the normal power supplied to your electrical outlets and light fixtures is 250vac 50hz. Most folks who post here are in North America where the power supplied to regular electrical outlets and light fixtures is 120vac 60hz. Larger appliances will use 240vac. I had an instructor once tell the class,"Electrons are electrons." Meaning electrons are going to go where they want so you better guide them.^_^

[8~{} Uncle Electrical Monster

I think it is 230 v though I did not test.

I believe someone posted a link showing that it's 230vac 50hz used in your country. I found it. ^_^

http://treehouse.ofb.net/go/en/voltage/Myanmar

I imagine the wire colors are different and wire sizes are much smaller than what is used in North America. I did some modifications to some portable housing units manufactured in Australia and the wiring was stranded where the wire used here is normally solid for use in wiring run to light fixtures and electrical outlets. The question I have is, does the power supplied to your lighting circuits and electrical outlets read 230vac from hot to neutral/ground? Is there a pair of hot wires at each outlet or is there just one hot wire? ^_^

[8~{} Uncle Curious Monster


I had checked several outlets before and found them containing three
wires (LNG) and being 230 V. I did not check the particular light and
fan in question. I think they are 230 V also.

At first, I thought maybe the fan shared the neutral with the light. But
what happens when both light and fan are on?


It shouldn't be a problem for the light and fan to share the same neutral and ground. If they are switched separately using the same Line/Hot wire, you want to use the same neutral. Here in North America, a bathroom sometimes has two separate switches for the light and exhaust fan but there is usually only one switch and the light/lights and fan are on at the same time. It's not rocket surgery. ^_^

[8~{} Uncle Neutral Monster

On Friday, March 16, 2018 at 3:23:03 AM UTC-4, Oumati Asami wrote:
On 16/03/2018 12:05, Uncle Monster wrote:
On Thursday, March 15, 2018 at 9:45:19 PM UTC-5, Oumati Asami wrote:
On 16/03/2018 03:27, Uncle Monster wrote:
On Thursday, March 15, 2018 at 5:11:36 AM UTC-5, Oumati Asami wrote:
On 15/03/2018 09:13, Uncle Monster wrote:
On Wednesday, March 14, 2018 at 9:38:55 PM UTC-5, Oumati Asami wrote:
How does this circuit work?

This house has 3 phase power.

I was replacing a downlight and found it having two black, two neutral,
and one blue incoming wire.

If the light switch was on, the blue wire was energized.
If the ceiling fan was on, one of the incoming black wire was energized.

Why/how do both light and fan work when both are on?

incoming downlight
a) ================(black)------------------
b) ================(neutral)----------------
c) ----------------(blue)------------------

Knowing which country you reside in would help. ^_^

[8~{} Uncle Electric Monster

I didn't think it matters. I'm in Myanmar if this helps.


I'm guessing the normal power supplied to your electrical outlets and light fixtures is 250vac 50hz. Most folks who post here are in North America where the power supplied to regular electrical outlets and light fixtures is 120vac 60hz. Larger appliances will use 240vac. I had an instructor once tell the class,"Electrons are electrons." Meaning electrons are going to go where they want so you better guide them.^_^

[8~{} Uncle Electrical Monster

I think it is 230 v though I did not test.

I believe someone posted a link showing that it's 230vac 50hz used in your country. I found it. ^_^

http://treehouse.ofb.net/go/en/voltage/Myanmar

I imagine the wire colors are different and wire sizes are much smaller than what is used in North America. I did some modifications to some portable housing units manufactured in Australia and the wiring was stranded where the wire used here is normally solid for use in wiring run to light fixtures and electrical outlets. The question I have is, does the power supplied to your lighting circuits and electrical outlets read 230vac from hot to neutral/ground? Is there a pair of hot wires at each outlet or is there just one hot wire? ^_^

[8~{} Uncle Curious Monster


I had checked several outlets before and found them containing three
wires (LNG) and being 230 V. I did not check the particular light and
fan in question. I think they are 230 V also.

At first, I thought maybe the fan shared the neutral with the light. But
what happens when both light and fan are on?

You can have an unlimited number of devices sharing a neutral. If you have a circuit with 8 lights, there is only one neutral.