bonding of grounding electrode conduit?

[mcknz]

Hello Gentlemen,
I've had the pleasure of viewing and learning from your wonderful website for some time but have only become a registered user. Thank you for your contributions to our industry. My question is this. Should a grounding electrode conduit which doesn't terminate with flexible metallic conduit and a ground hub i.e. a 2" conduit with one 500 MCM be required to have a full size (500MCM) bonding jumper from conduit end to building steel or ground bus? In this situation a flexible metallic conduit and ground hub was eliminated due to the size restrictions and a #6 AWG ground was attached from the MIGB to the ground bus / building steel. Is this permissible or is the full size 500MCM bond required? thank you for any input you may have. mcknz

 

[infinity]

Yes it's required to be the same size as the GEC or larger. For a 500 kcmil conductor it's better to use a hub the bond the GEC directly to the conduit. For what it's worth I see large GEC's with small bonding jumpers connected to a bonding bushing all of the time. Take a look at 250.64(E).

Welcome to the forum.