White is common. Common and ground are the same inside a sub panel but outside the sub panel they preform different functions. A ground is there to protect from shock in case there are any voltages from the wiring to the frame of an appliance. It protects you from being the conductor of a voltage fault to ground. A ground never carries a current unless there is a fault.
A common always carries a current when an appliance is on and is a shock hazard due to it being above a 0 volt threshold when a current is present.
Ground and common shouldn't be mixed outside the sub panel. Run separate wires.
I see it done by equipment installers at work, using a ground for a common, but it is a dangerous practice.
Steve
On 9/20/2011 9:46 AM, hapennyherald wrote:
Have something I am uncertain about. The wiring to a stove top is 3 wire + ground Has Black Red White and a smaller bare. The cook top has Black Red Green all insulated.
My inclnation is Black to Black Red to Red and White to Green (since the white and ground are attached to the same bar in the panel) and attach the bare wire to the metal box ( since metal boxes have to be grounded.
Also would you advise wiring an outlet or hardwiring?
Thanks David
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