Joining multiple ground in one box


Old 07-07-07, 10:28 AM
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Join Date: Mar 2007
Location: downeast maine
Posts: 35
Joining multiple ground in one box

Let's say I have two lights, each on a separate switch. The two switches are in the same box. Each light is on its own circuit. Do I have to connect all 4 ground wires together (i.e. the two from the lines and the two from the loads?). Could I connect them in pairs (i.e. each line and load paired together)? I would assume that all being connected together would be better because it would make it less likely for a failure of the ground, sort of a redundancy thing, but is it a requirement?

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Old 07-07-07, 10:42 AM
Join Date: Sep 2003
Location: Central New York State
Posts: 13,973
Yes, all four ground wires must be connected together. The junction box, if metal must also be connected to these grounds, as must each switch.
Old 07-07-07, 02:22 PM
Join Date: Sep 2000
Location: United States
Posts: 18,497
But DO NOT connect all four white wires together.

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