NEC 250.134 (A) with respect to bonding enclosures w/ bolt

[don_resqcapt19]

The prescriptive rule in 250.86 requires a connection to an EGC. There is no provision in that section to let a bonding jumper or bolt to be used in place of the EGC. That being said, the performance rules in 250.4 appear to permit the bonding of the enclosure by methods other than an EGC. It is my opinion that a specific and or prescriptive rule takes precedence over a non-specific or performance rule.

 

[Twoskinsoneman]

The prescriptive rule in 250.86 requires a connection to an EGC. There is no provision in that section to let a bonding jumper or bolt to be used in place of the EGC. That being said, the performance rules in 250.4 appear to permit the bonding of the enclosure by methods other than an EGC. It is my opinion that a specific and or prescriptive rule takes precedence over a non-specific or performance rule.

Don I respect you a lot, but you have consistently ignored point after point that I have made concerning this issue. You have not been able to explain the different arguments presented. Your whole argument seems to be based on "the NEC does not specifically say a bolt is an EGC"....
I, and others, provide code to the contrary and you are quiet on it.

 

[Twoskinsoneman]

I look at it this way; If they don't allow the "grounded conductor" to be connected via metal enclosure(art.200.2(B) 2008NEC) then they shouldn't allow the "grounding conductor" to be either. They both are responsible for carrying fault currents.

Does this mean in your panels you run a bonding jumper from every metal conduit, AC cable etc you install to the ground buss? That one be a useless rule.

There is a big different between being capable of clearing fault current (short duration, rarity) than continuously carrying all the unbalanced current of the panel.

 

[don_resqcapt19]

Don I respect you a lot, but you have consistently ignored point after point that I have made concerning this issue. You have not been able to explain the different arguments presented. Your whole argument seems to be based on "the NEC does not specifically say a bolt is an EGC"....
I, and others, provide code to the contrary and you are quiet on it.

That is the whole point and there is nothing in the NEC that says a bolt can be an EGC. There are sections that will permit bolts to be used as bonding jumpers, but nothing that says it can be an EGC.