On Mon, 30 Apr 2018 14:28:40 +0100, "Jimmy Wilkinson Knife"
wrote:

On Sun, 29 Apr 2018 15:58:15 +0100, wrote:

On Sun, 29 Apr 2018 15:13:59 +0100, "Jimmy Wilkinson Knife"
wrote:

On Sun, 29 Apr 2018 04:24:42 +0100, wrote:

On Sun, 29 Apr 2018 02:01:15 +0100, "Jimmy Wilkinson Knife"
wrote:

On Sat, 28 Apr 2018 18:36:03 +0100, wrote:

On Sat, 28 Apr 2018 17:47:11 +0100, "Jimmy Wilkinson Knife"
wrote:

On Thu, 26 Apr 2018 05:09:28 +0100, Clare Snyder wrote:

On Wed, 25 Apr 2018 23:30:28 -0400, Ralph Mowery
wrote:

In article ,
says...

I do have a couple of sockets wired so each outlet of the double outlet
are connected to each side of a 240 volt line. The reason is it is next
to a 240 volt socket that feeds that 120 volt one. I did that for my
ham radio station so I can run an amplifier on 240 volts. I also have a
120 volt amplifier that draws lots of current so when using it, I have
heaver wire. That is one place where your system of everything on a 240
volt line would have been handy.

That (Edison circuit) isn't cricket. You can't guarantee the neutral
current is within spec. I have 220V outlets wired with normal 12/2
(with white wire painted red) but a shared neutral between two 120V
circuits on opposite legs of the 240V isn't legit.

Dmned right it is. It's not only legal, it was REQUIRED BY CODE

Why are you so obsessed with code?

for kitchen countertop outlets in Canada for over 20 years. The last code
revision is now requiring 20 amp countertop outlets instead of the
"split" 15s.
No reason I see that isn't just as sound as any other Edison circuit,
as long as the breaker is sized for the conductors. If he has 12 gauge
wiring, with a 20 amp double breaker, the neutral current will not
exceed 20 amps.

and if there is 20 amps on each side, there is NO neutral current.

Unless you have inductive and capacitive loads....

Triplin harmonics really just affect 3 phase but maybe that is what
you have there.

I can't be bothered doing the calculations, but are you telling me that an inductive load in series with a resistive load will produce no neutral current in the middle?

You can bother yourself if you want but it is true. Triplin harmonics
in 3 phase are a problem but we do not see it in single phase.

That can't be right. Just thinking about it simply - the current leads or lags the voltage with different types of load. So the centre point (neutral) has to have current going in different directions at different times.

I used to say that too but it does not seem to be an issue.

No it isn't. It won't exceed 20 amps. But it might not be zero.

Even in
3 phase it takes a fairly specific load to cause the problem. A
building full of solid state fluorescent ballasts seem to be the worst
if they are not PF corrected. Most commercial grade are these days,
just for that reason.
Commercial lighting should make you happy though since it is usually
277 volts.

Why 277?!

One phase of a 480wye.

Why do they use 480?

Same reason you are pimping for 220. It allows smaller conductors for
a given amount of delivered power. 480 is common for services to large
installations like office buildings and gets distributed to each floor
as 480 where a transformer will take that down to 120/240 or 120/208.
The house lighting will usually be 277 using one 480v phase to
neutral.