Ground question

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  #1  
Old 06-20-14, 03:44 PM
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Ground question

My question:
Do you always use size AWG 6 ground for grand rods, size awg 4 runing from water meter and AWG 6 from the foundation. Also how that works with commercial services is that any different?
 
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Old 06-20-14, 03:52 PM
Tolyn Ironhand's Avatar
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The wire to the ground rod is not required to be larger than #6 copper.
The size of the wire going to the water service is based on table 250.66. This is for any electrical service, commercial, residential, farm, etc.
I don't recall the foundation GEC size. I am not near a code book. I want to say that is also based on 250.66 but others will correct me.
 
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Old 06-20-14, 07:00 PM
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Do you always use size AWG 6 ground for grand rods, size awg 4 runing from water meter
These are the two most common grounding points you'll find in residential work. Like Tolyn said, you never need bigger than #6 to the ground rod. In following table 250.66 you'll see that the number #4 (assuming you meant copper) is for a 200 amp service, but #2 aluminum is also approved. If it were a 100 amp service, #6 copper or #4 aluminum is approved. After these common sizes I always check the NEC table 250.66.
 
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