Brian wrote:

On Mon, 16 Feb 2009 20:53:58 -0600, "Pete C." wrote:


Brian wrote:

If on a 220 single phase circuit the neutral and ground wires attach to the same buss bar in the
panel, why are they both needed ????

Thanks
Brian

On a 240V single phase circuit, a neutral is not needed. If you want to
run 120V loads then you need a neutral, but then it's a 120/240V
circuit.

But doesn't 120 volt also use a neutral and ground ????

120V circuits normally use a neutral. Grounds are used on both 120V and
240V circuits. The ground is a non current carrying safety connection,
the neutral is the current carrying return path for the circuit.