Service Raceway Bonding

[infinity]

I'm having a brain fart. I have 10-4" EMT's entering a 4000 amp service with bonding bushings. To bond the service raceways I would size each bonding jumper according to the conductors within each raceway (600 kcmil copper). If using a single bonding jumper for all ten raceways what size would it be? 600*10*12.5%=750????

 

[Dennis Alwon]

I'm having a brain fart. I have 10-4" EMT's entering a 4000 amp service with bonding bushings. To bond the service raceways I would size each bonding jumper according to the conductors within each raceway (600 kcmil copper). If using a single bonding jumper for all ten raceways what size would it be? 600*10*12.5%=750????

I think that's correct. 750 kcm

 

[infinity]

I think that's correct. 750 kcm

I thought that the handbook had a graphic showing both methods but I couldn't find it in the 2011 NECH. Do you have a code reference?

 

[electrofelon]

I thought that the handbook had a graphic showing both methods but I couldn't find it in the 2011 NECH. Do you have a code reference?

250.102(C)(2)? I find the wording rather poor and it's kind of confusing.

 

[electrofelon]

It's not really clear to me when they are referring to a single BJ bonding ALL of the raceways (looped thru all), or an individual BJ to each raceway

 

[Dennis Alwon]

@infinity I didn't look closely at this because I am doing something else.

 

[infinity]

@infinity I didn't look closely at this because I am doing something else

Thanks.

 

[Dennis Alwon]

Thanks.

Sorry that is from the 2020 nec enhanced content.