[Amps] 220V wiring: Was Question about safety ground connection

[Will Matney]

Mike,

AMEN! You have to use a 4 wire cord if you intend on having access to 120 and 240 vac from the same source. NEC rules does not allow using a neutral for a hot, plus you need a ground. The NEC actually had a change here recently about new stoves, etc requiring a seperate ground if I recall.

Best,

Will


*********** REPLY SEPARATOR  ***********

On 11/15/05 at 6:02 PM Mike McCarthy, W1NR wrote:

>Everyone.  When talking about a 220V outlet FORGET about what it may or
>may
>not do at the breaker box.  A 3 prong 220V outlet is 2 hot and GROUND.  A 4
>prong 220V outlet (also called 110V/220V) has a neutral added.
>
>You cannot safely connect a 110V device to 1/2 of a 3 conductor outlet.  In
>this case, you are using the ground as neutral and are in violation of the
>National Electric Code.
>
>Breaker panels may or MAY NOT have neutral and ground bonded.  The breaker
>box in my radio room, by the code, has separate neutral and ground busses
>connected to the main entrance with a 4 conductor feeder.
>
>This is what is mandated by the NEC.  It is not dictated by the breaker
>box.
>
>Your safest bet is to run 4 conductor wire and outlets.  All new ranges and
>dryer circuits must be 4 wire.  As far as I am concerned, all new amplifier
>circuits should be too.
>
>Mike, W1NR
>
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