Sub-Panel Grounding?

Bicoronal

Discussion Starter · #1 · May 21, 2011

1043 3

I had an electrician install a 50-amp sub-panel in my basement a few years ago. He used an existing 3-wire (black, red, white, no ground) 6 gauge cable. It is fed from a 50 amp breaker in the main panel in the attached garage. The ground bus on the sub-panel is connected to the main copper water line by #4 green wire.

Is this proper? I have read on other posts that a sub-panel should be connected to the main panel with 4 wires.

Thanks.

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Saturday Cowboy

· Scared Electrician

Joined Nov 29, 2009

·

715 Posts

#2 · May 21, 2011

no it is not proper and never was.

vsheetz

· Registered

Joined Sep 28, 2008

·

1,802 Posts

#3 · May 21, 2011

To correct this can the OP just run a ground wire from the main to the sub panel - and leave the existing cable as is?

Saturday Cowboy

· Scared Electrician

Joined Nov 29, 2009

·

715 Posts

#4 · May 21, 2011

vsheetz said:
To correct this can the OP just run a ground wire from the main to the sub panel - and leave the existing cable as is?

the short answer is NO

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