PullBox Common Ground?


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Old 11-11-13, 11:23 AM
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PullBox Common Ground?

In a previous post - I had inquired about how to properly bond a pull-box that lives at the end of a 20 or so foot run of 1.5" - FMC.

Based on the replies - it sounds like running a large conductor to a ground bar in the box is the most efficient way to run the most number of circuits in this conduits when constrained by conduit fill limitations and conductor de-rating.

So...


I like the idea of running a common ground to the pull box...

anyone know if it is code in LA (California) to run say a common #4 ground wire to the ground bar (even with derating of 50%) that would give me 47.5Amp (95 Max * 50%)

Then just run the hot/neutral in the conduit to save space?

if so, this would solve my issues for not having enough space.

Thanks!
ERik
 
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Old 11-11-13, 01:09 PM
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The grounding wire is based on the largest circuit in the conduit. What is he largest circuit you will have in the flex?
 
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Old 11-11-13, 01:27 PM
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Largest Run

the largest run i would has will be the furture oven circuit -- which depending on the oven will be - between 40 and 50 Amp
 
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Old 11-11-13, 10:56 PM
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The size of the ground wire for circuits 30A to 60A is #10 copper, bare or green. And for the life of me I can't think of a reason to upsize it for bundling. But even if upsizing is necessary, #4 is overkill. #6 would be more than enough.
 
 

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