240vac circuit question

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  #1  
Old 06-16-13, 07:23 AM
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240vac circuit question

On standard 240vac circuits (black, white, bare ground in romex):

Is the ground connected to the neutral? Looks like it goes to the ground circuit on service panel.
 
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Old 06-16-13, 08:16 AM
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The ground is connected to the ground.

If it is in the main service panel, the grounds and neutrals are bonded, so it can be terminated at either. If it's a sub panel it needs to be connected to the ground. The ground, being bonded to the neutral at the main service disconnect, allows the breaker to trip in the event of a fault.
 
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Old 06-16-13, 03:13 PM
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Regardless of how it is connected, a white wire is NEVER an equipment ground and a straight 240 volt single-phase circuit NEVER uses a white wire. When a two-conductor cable such as type NM is used for a 240 volt circuit the white wire is REQUIRED to be re-identified some color other than white, grey or green.
 
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Old 06-16-13, 05:40 PM
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Thanks. Good info. I'll put it in my archive
 
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