Originally posted by OVES:
Inspector said that 250.102(C) requires each conduit to be bonded independently, not daisy-chained. If they are to be daisy-chined, then the ground wire must be increased to equal the sum of all of the conduits. Sounds crazy and I can't get that out of the text. Has anyone else run into an inspector with similar views?
He is correct in that the bonding jumper must be larger than 3/0 if the phase conductors are larger than 1100 kcmil, however nowhere in 250.102(C) does it say that you can't daisy chain the bonding conductor. Nor does it say that if you do "
then the ground wire must be increased to equal the sum of all of the conduits. What it does say is this: The bonding jumper shall not be smaller than the sizes shown in Table 250.66 for grounding electrode conductors. Where the service-entrance phase conductors
are larger than 1100 kcmil copper or 1750 kcmil aluminum,the bonding jumper shall have an area not less than 12½ percent of the area of the largest phase conductor.
You could theoretically have multiple conduits with a total of less than 1100 kcmil and then size that bonding jumper directly from table 250.66 even though it's being daisy chained through all of the bonding bushings. It's the total circular mils that determines sizing, not the fact that you've daisy chained it.
[This message has been edited by Mvannevel (edited 09-15-2005).]
[This message has been edited by Mvannevel (edited 09-15-2005).]
