ECN Forum Forums Code Related Discussion NEC & other Code issues grounding a ct cabinet

OK, here the enclosure bond is made via the neutral lug(s) that are mechanically connected to the enclosure in a 'hot sequence' install.

In a 'cold sequence' install (disco or MOCP ahead of the CTs) the neutral 'floats' and a bond for the CT cabinet is required.

See 250.122

from the ct cabinet to the ist main the Neutral is your bond,
also install a bonding strap or jumper from XO in CT cabinet to cabinet. (Usually supplied by manufacturer of Cabinet.
If not size a conductor using 250.66

Installing EGC would give you a parallel neutral as your also required to bond in MDP.

See Soares grounding book or goggle Soares info on net

http://iaeimagazine.org/magazine/1998/11/01/service-main-bonding-jumpers/