On Thursday, February 15, 2018 at 2:52:10 AM UTC-5, Diesel wrote:
"James Wilkinson Sword"
news
alt.home.repair, wrote:
On Wed, 14 Feb 2018 21:02:07 -0000, trader_4
wrote:
On Wednesday, February 14, 2018 at 2:38:30 PM UTC-5, trader_4
wrote:
On Wednesday, February 14, 2018 at 12:23:37 PM UTC-5, Pat L
wrote:
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 know that there are converter that will convert 110V to 220V
but I am afraid the 15A circuits can not handle the machines.
Anyone out there really know what I can do or buy to make this
happen?
First, if you are in the USA it's 240v, so let's assume the
machine is ok with that. You can't put a 20a receptacle on a
15a circuit, ie a circuit with a 15a breaker and 14g wire.
Looks like your only option is a new 240v circuit.
Let's try again. I saw where you said you wanted to put in a 20A
receptacle. But the machine only needs 10A. So, you could use a
240V 15A receptacle. The rest of what you're trying to do gets
more dicely. As I understand it, you want to take two existing
branch circuits that are on separate breakers, 15A?, and turn
them into an Edison circuit/shared neutral circuit that still
powers the existing two circuits plus the added 240V 15A
receptacle. You'd have to replace the two breakers with a single
double pole 15A breaker. Then the physics and basic safety work,
but you still have other potential issues:
Are 240V and 120V receptacles permitted on the same circuit? I
don't know of any code provision that says no.
You'd have to make sure there aren't any other code issues with
converting this into a shared neutral circuit.
Being in the UK I'm not sure how this works in the US. But before
those namby pamby circuit breakers, you just had -110V, 0V, +110V.
You could take 110V from either of the 0V and 110V wires, or 220V
from the two 110V wires. Do the circuit breakers think there's an
earth fault if you try to run a 220V device off two 110V wires? I
thought an American circuit was paired - i.e. the two 110V lines
were linked and run off a dual breaker which would accept a 220V
device?
Umm... Where are you getting consistent polarity from?
It's ac there is no consistent polarity.
You have 240
from hot to hot, and 120 from either hot to neutral. To get the full
240volts, you use both hots and forget the neutral.
Which is what the op said they want to do. They want to take two 120v circuits that are on opposite legs and use them for a 240v receptacle. There are code issues, but the physics works. They would wind up with support for both 120v at the existing outlets and 240 at the new one.
AC isn't
consistent polarity in the positive/negative sense. It changes. In
the case of the states, roughly 60 times a second.
It depends on the 'dual breaker' aspect
It depends on the two circuits being on opposing legs which you would do with a double pole breaker. But it's irrelevant if you are going to follow code because while it will work, it won't meet code.
.. Some what I call 'mini'
duals are using the same phase to feed both; those are easily seen in
our panels because they use a single slot. The duals which take two
slots are using both legs. They can provide 240volts, where as the
mini single slot breaker cannot; since it's only using one of the two
phases in the panel.
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