Electronics > Beginners

How to wire up a 240VAC receptacle

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oPossum:

--- Quote from: IanB on September 09, 2018, 12:58:08 am ---
--- Quote from: Spork Schivago on September 08, 2018, 10:28:05 pm ---My wife already picked up the 10/2 (black, red, copper) I wanted the 10/3.
--- End quote ---

You mean black, white, copper?

--- End quote ---

black/red/bare is used for NEMA 6 and L6 series receptacles. They have L1, L2 and ground. No neutral.

IanB:

--- Quote from: oPossum on September 09, 2018, 01:17:52 am ---black/red/bare is used for NEMA 6 and L6 series receptacles. They have L1, L2 and ground. No neutral.
--- End quote ---

Sure. But please look at the context:


--- Quote from: Spork Schivago on September 08, 2018, 10:28:05 pm ---Can I buy 10/2 with black and red instead of black and white?   I've seen 10/3 with black, red, and white....My wife already picked up the 10/2 (black, red, copper) I wanted the 10/3.
--- End quote ---

Given the context, do you now understand my question?

oPossum:
I don't really understand any of your questions. I don't think he did anything wrong, and it passed inspection.

IanB:

--- Quote from: oPossum on September 09, 2018, 02:13:49 am ---I don't really understand any of your questions. I don't think he did anything wrong, and it passed inspection.

--- End quote ---

Please. Spork asked, "Can I get cable with black, red and copper cores?" And in the very same sentence he said, "My wife bought some cable with black, red and copper cores."

Why ask that question if it is already answered?

So given the context of everything else, I think that was a typo. I think his wife bought cable with black, white and copper cores, and then when he installed it he put red shrink wrap over the white insulation to mark it as a live wire.

6PTsocket:

--- Quote from: IanB on May 14, 2018, 07:43:11 am ---You haven't been told you can't use NM-B to wire a fixed circuit from the breaker panel to a wall outlet. You can. That's why an electrician is able to do so and have the work pass inspection.

You keep getting hung up on "hot" and "neutral". But a circuit has two wires. You can think of them as "out" and "back". Whatever current flows "out" has to flow "back". 20 amps out, 20 amps back. The current in the two conductors is always equal and balanced. That's why you can't add up 20 and 20 to get 40.

You can work out for yourself why two 120 V, 20 A circuits do not add up to a 240 V, 40 A circuit. Think about it. 120 V x 20 A = 2400 W. Therefore 2 x 120 V x 20 A = 4800 W. But 240 V x 40 A = 9600 W. And 4800 W does not equal 9600 W. It doesn't add up.

If your load draws 30 amps then the "out" wire has to carry 30 amps and the "back" wire has to carry 30 amps, and each pole of the breaker has to carry 30 amps.

--- End quote ---
Two 120 v circuits do add up to 240 if they are coming from the two legs of a 240 feed and not the same leg. Either hot to neutral is 120. Hot to hot is 240.

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