Bus

[hhsting]

If I have main bonding jumper as bus manufacturer provided or not then NEC 2014 section 250.28(D) says must be sized per Table 250.102(C)(1). Note it does not say if wire then size it just says sized per NEC 2014 Table 250.102(C)(1). Also 250.28(A) says main bonding jumper can be bus note does not say manufacturer provided or not.

I am wondering how does one do calculation for sizing of main bonding jumper size if the main bonding jumper is bus?

 

[augie47]

Pretty much the same as answered for you in 2020

Main bonding jumper

NEC 2014 section 250.28(A) main bonding jumper can be bus or wire. NEC 2014 section 250.28(D)(1) main bonding jumper size shall not be smaller than table 250.102(C)(1). Two questions: 1. Table 250.102(C)(1) does not say how to size main bonding jumper if it’s factory installed bus? Anyone...

forums.mikeholt.com

If it's service rated the factory should supply the jumper which has been engineered,.

 

[hhsting]

Pretty much the same as answered for you in 2020

Main bonding jumper

NEC 2014 section 250.28(A) main bonding jumper can be bus or wire. NEC 2014 section 250.28(D)(1) main bonding jumper size shall not be smaller than table 250.102(C)(1). Two questions: 1. Table 250.102(C)(1) does not say how to size main bonding jumper if it’s factory installed bus? Anyone...

forums.mikeholt.com

If it's service rated the factory should supply the jumper which has been engineered,.

Ok but this one sort of different. What if its not manufacturer provided bus? 250. 28(A) just says bus does not say manufacturer provided or not. How would one size it?

 

[tom baker]

That info is not in the NEC. It would be a UL standard, or contact a copper bus bar neg.