J jimalone Member Feb 14, 2005 #1 smallest sizecopper grounding electrode tap for separately derived alt current system for 3 sets of 300kcmil secondary conductors i say 1/0 freind says 2/0 have older code book not sure
smallest sizecopper grounding electrode tap for separately derived alt current system for 3 sets of 300kcmil secondary conductors i say 1/0 freind says 2/0 have older code book not sure
B bphgravity Senior Member Location Florida Feb 14, 2005 #2 Re: grounding electrode debate 3 sets @ 300-kcmil = 900-kcmil equivalent. Per Tabl3 250.66, 2/0 copper GEC required.
Re: grounding electrode debate 3 sets @ 300-kcmil = 900-kcmil equivalent. Per Tabl3 250.66, 2/0 copper GEC required.
A allenwayne Senior Member Feb 14, 2005 #3 Re: grounding electrode debate 250.66 sizes GEC to largest possible feeder for that amperage rating,Right ???
Re: grounding electrode debate 250.66 sizes GEC to largest possible feeder for that amperage rating,Right ???
charlie b Moderator Staff member Location Lockport, IL Occupation Semi-Retired Electrical Engineer Feb 15, 2005 #4 Re: grounding electrode debate It's related to amperage, but amperage itself is not part of the equation. All that matters is the cross-sectional area of the phase conductors. I agree with the 2/0 answer.
Re: grounding electrode debate It's related to amperage, but amperage itself is not part of the equation. All that matters is the cross-sectional area of the phase conductors. I agree with the 2/0 answer.