trader_4
Thu, 15
Feb 2018 12:57:54 GMT in alt.home.repair, wrote:
Why would you ever connect the two wires period? YOU are the one
that started talking about connecting the two wires together. The
OP clearly stated what they were talking about. They were
proposing to connect the 240V load between the two circuits that
exist on opposite legs.
The OP mentioned 'combining' them...
MID:
I bought two mahjong machines in China to use in the US but I forgot
they use 220 over there. So I want to install a US 220V 20A
female receptor by using two legs of 110V 15A circuits and
mounting a box next to one of my 110v outlets. That done I want to
convert that over to 220V, neutral, & ground to run my machines.
The cord into the machine has "L" "N" and "gnd". I want to combine
the two 110 legs to one 220 leg.
*** end paste
They can't combine the two 120volt legs into a single leg as they
wrote they wanted, simply by connecting the two legs to each other.
I mentioned that for the purposes of clarity, based on what the OP
wrote they would like to do.
If the two 120volts circuits are not fed by the same hot
leg/phase, you WILL most certainly get the arc flash I previously
wrote about if you just try to wire those hots together to create
240volts on a single wire. IE: make a pigtail.
And again, no one except you ever proposed connecting them
together.
Re-read the OPs post...
MID:
I bought two mahjong machines in China to use in the US but I forgot
they use 220 over there. So I want to install a US 220V 20A
female receptor by using two legs of 110V 15A circuits and
mounting a box next to one of my 110v outlets. That done I want to
convert that over to 220V, neutral, & ground to run my machines.
The cord into the machine has "L" "N" and "gnd". I want to combine
the two 110 legs to one 220 leg.
I clearly stated that while it will work, I don't see a way to do
it code compliant.
One, the supply is going to be 240volts across two seperate leg
fed hot wires, instead of one as originally called for.
As originally called for by whom?
The manufacturer who wired it for L,N,G 220volt/50hz
Three,
neutral is now a hot wire. The direction of current flow does
matter with some things. The internal wiring would tell the tale,
though.
No, the neutral is not a hot wire, it's still a neutral. It
becomes a shared neutral or Edison circuit.
It's not going to be used for the device the OP wants to connect.
The device will have two hots and a ground. As the device has line,
neutral, and ground connections intended for connection to an
electrical system that's different than ours. On the intended
electrical system, they get 220volts 50hz/ac on a single hot wire,
where as we get 120volts 60hz/ac on a residential systems hot wire.
We use two hot wires to get 240volts with residential, they don't.
We seem to have a miscommunication here. I was writing about the
mahjong table device, specifically. I wasn't writing about any
existing circuit taps, edison circuits, etc.
Also...
I was doing a tiny amount of researching these tables and came
across this:
https://www.alibaba.com/product-deta...419851227.html
That motor is rated for 220volt/110volt ac.
Rated Voltage:220V/110VAC
Rated Frequency: 50Hz/60Hz
Under product description.
I don't know that his table is using one of those motors
specifically, but, it's possible it is. And, it's also possible
whatever other electrical components are present are also okay with
110volts at 60hz. If it were my table, i'd look into it before I
went and ran another circuit to feed it. It could be nothing more
than attaching a standard american 3 prong power cord to it and
plugging it into a normal 120volt outlet here.
MID:
I bought two mahjong machines in China to use in the US but I forgot
they use 220 over there. So I want to install a US 220V 20A
female receptor by using two legs of 110V 15A circuits and
mounting a box next to one of my 110v outlets. That done I want to
convert that over to 220V, neutral, & ground to run my machines.
The cord into the machine has "L" "N" and "gnd". I want to combine
the two 110 legs to one 220 leg.
If they are on opposite legs, which is
what the poster said they were going to do, then you have 240V
between them which is what the machine needs.
The machine is wired for 220volts at 50hz on a single hot wire.
And there you go again with the "single wire". That machine uses
two wires, so does a 120V light bulb.
Yes, single hot wire carrying 220volts (or so) at 50hz, where as our
residential ones carry 120 at 60hz...(or so). I didn't say the
machine didn't use two wires. I said it's using one live and one
neutral at 220volts 50hz, in it's current configuration. In order to
convert it to our system and give it 240volts, it won't have a
neutral connection anymore. It'll be our second hot leg, instead.
*shrug*
Like
you'd expect to see in commercial lighting and such here in the
states. 208/277 (at 60hz) etc on a single phase hot wire. As in:
208/277, etc, line to neutral. Not line to line, as you're
suggesting they reconfigure it to be.
Nonsense.
What specifically is nonsense? The table has a single L, n, and
ground connection. In order to give it 240volts here from a
residential power source without using a converter is by connecting
our second hot leg to it's neutral. Line to line is what your
suggestion would become.
I'd be surprised if you were unaware of various electrical voltages
available via a single hot wire vs two in the states.
I've troubleshot and repaired a lot of poleheads, and, uhh, that's
most certainly 277 volts (or more) on a single hot wire, with a
neutral and ground present on the majority of them. I can't even
count how many poles i've rewired not even including the new ones
i've helped install. Or the various other nifty/interesting kinds of
commercial electrical things I've worked on, but, 277 is a pretty
damn common voltage level here, delivered via ONE HOT wire.
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