Bonding at the Service

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Grouch1980

Grouch1980

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New York, NY
Hi all,
I pasted a code section from the 2008 NEC. This is section 250.92(B). The language confuses me. So you can do either 1, 2, 3, or 4, under (B). But isn't #1, "bonding equipment to the grounded service conductor in a manner provided by 250.8", required? This is the main bonding jumper. The section makes it sound like the main bonding jumper is optional, and you can go with any of the other options. unless they're implying you don't need the MBJ, and you can just have the non-current carrying metal enclosures carry the fault current back to the supply, rather than having the neutral do it. I've never heard of doing it that way though.


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So your question would be similar to this ? If you have a meter beside a gutter beside a panel. All rigid conduit with grounding lock nuts. No eccentric knockouts. Why do electricians usually add a ground lug on the gutter ?
Is that sort of what you mean ?
 
What i mean is, it seems that the code section I posted is saying that main bonding jumpers are optional, as long as you follow any one of the other options (2, 3, or 4). i always thought the main bonding jumper is mandatory. Somehow i feel like your answer is in your post lol, but i'm not following.
 
The section you cited is for bonding of equipment and has nothing to to with the system bonding that is required in Part II of Article 250. The main bonding jumper provides the system bonding.
Compliance with the rules in Part II and Part V are both required. One does not eliminate the other.
 
don_resqcapt19 said:
The section you cited is for bonding of equipment and has nothing to to with the system bonding that is required in Part II of Article 250. The main bonding jumper provides the system bonding.
Compliance with the rules in Part II and Part V are both required. One does not eliminate the other.
Click to expand...
I'll reread it again tonight, with that in mind... thanks!
 
don_resqcapt19 said:
The section you cited is for bonding of equipment and has nothing to to with the system bonding that is required in Part II of Article 250. The main bonding jumper provides the system bonding.
Compliance with the rules in Part II and Part V are both required. One does not eliminate the other.
Click to expand...
I think I follow now. The section i posted, like you said, has nothing to do with the main bonding jumper. 1,2,3, and 4 just have to do with how to properly bond the metallic enclosures. And (B)(1) just states you have the option of bonding to the grounded service conductor / neutral bus bar. do i have this right?

EDIT: so (B)(1) has to do with 'equipment bonding jumpers'... not the 'main bonding jumper'. Do I have the nomenclature right? (based on the 2008 NEC version).
 
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Grouch1980 said:
I think I follow now. The section i posted, like you said, has nothing to do with the main bonding jumper. 1,2,3, and 4 just have to do with how to properly bond the metallic enclosures. And (B)(1) just states you have the option of bonding to the grounded service conductor / neutral bus bar. do i have this right?

EDIT: so (B)(1) has to do with 'equipment bonding jumpers'... not the 'main bonding jumper'. Do I have the nomenclature right? (based on the 2008 NEC version).
Click to expand...
Yes, on the line side of the service equipment, you can use a bonding jumper from the grounded conductor to bond any metallic items that require bonding.
 
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