What wire gauge for plumbing ground?
I need to install a grounding jumper wire around a pressure reducing valve in my all copper plumbing system. My question is what gauge copper to use? I've a 200 amp service but don't go anywhere near that load.
I saw this on a website and wonder if I need the size shown for 200 amp service for this jumper (#3). I was going to go with #6 or 4. Not sure if #3 would fit into 3/4" grounding clamp? The original house panel was 100 amp but it was just upgraded and inspected with no changes to original grounding to outside or other plumbing jumpers (gas pipe to water):
Table of Electrical Ground Wire Sizes
Ground Wire Gauge CU (Copper) - wire size Electrical Service Size
#8 to 100A
#6 to 125A
#4 to 165A
#3 to 200A
Some other threads (one or two on this site) say #4 copper is good for up to 200 amp service.
I guess #4?
Last edited by bob22; 04-03-2010 at 09:09 AM.