GEC and bonding jumper size

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d6183

Member
a friend of mine is telling me that i am wasting time and money sizing larger than 3/0 copper for gec and bonding jumper based on 250-66 for parallel conductors over 1100kcm copper but i have always sized to 12.5% of the total circ mils? isn't that the correct method?
 
iwire

iwire

Moderator
Staff member
Location
Massachusetts
Re: GEC and bonding jumper size

The main bonding jumper must be 12 1/2% of the service conductors. 250.28(D)


However the GEC and any grounding electrode bonding jumpers will only have to be 3/0 CU.
 
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pierre

Senior Member
Location
Westchester County, New York
Re: GEC and bonding jumper size

The GEC and the Main Bonding Jumper serve two different purposes, that is why the MBJ is required to be sized larger than 3/0 for services with Service Entrance Conductors larger than 1100 Kcmil.

Pierre
 
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