Ground Wire On 220V Recepticals To Neutral Bar? Not?

Old 06-20-02, 12:26 PM
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Ground Wire On 220V Recepticals To Neutral Bar? Not?

I posted this as a reply to another thread but then thought it better to ask it as a new thread.

If running a three wire armored cable to a 22OV receptical which contains the typical black, red, and white wires, the red and black go to the two power connections.

1) There is no prefered polarity for these, correct?

2) Should the white (normally neutral) wire be connected to the ground on the receptical and then tied to the ground bar (not the neutral bar) in the panel/subpanel?

3) Although the receptical would work, is it a mistake to connect the white neutral wire from the ground on the receptical to the neutral bar in the panel?

4) Armored cable comes with a skinny bare aluminum wire in it along with the insulated conductors. Is it adequate to connect this little wire to the ground contact on the receptical. If so, it it adequate for all amperages outlets, 20A, 30A, 40A, 50A, 60A etc.? If that is all that is required, then a two wire armored cable would be adequate, right?

Or if pulling wires, a 14ga ground should be adequate for a 60amp receptical (6ga THHN)?

P.S. Do most people recommend using 10ga. for an air conditioner circuit, even if the unit will be no bigger than say 18,000 BTU? A modern 220V air conditioner doesn't pull anywhere near 20 amps until it gets up to around 35, 000 BTU. 12 gauge is good for 20 amps.
Old 06-21-02, 06:41 AM
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1. No polarity or color code when considering two hot conductors. Is there a neutral connection at the recept.?

2. The jacket of the bx with the metal strip may be used as the ground. Is the plan to use the white conductor as a ground too? If so, it's a good idea, but be sure to reidentify the color to green. This would only happen if the neutral was not needed for a fourth prong on the recept.

3. It's ok as long as the panel you refer to is the main panel with the neutral and ground tied together. Reidentify the color to green for ground.

4. considering what I said, yes.

5. 60- amp breaker gets a #10 copper minimum for ground.

6. (PS) yes, if the run is more than 60 feet long or so.

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