Bonding Jumper inside metal junction box

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Grouch1980

Grouch1980

Senior Member
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New York, NY
Hi all,
This is regarding section 250.148: "Continuity and attachment of EGCs to boxes"

Part (C) of this section, you tie (using a wirenut) the EGC's together and connect them to the grounding screw on the metal box... that bonding jumper from the wirenut to the grounding screw... is that sized based on section 250.102(D)?... which is the equipment bonding jumper on the load side of an overcurrent device?

I don't see 250.148 mentioning the size, so I'm assuming you go back to 250.102(D).
 
Grouch1980 said:
Hi all,
This is regarding section 250.148: "Continuity and attachment of EGCs to boxes"

Part (C) of this section, you tie (using a wirenut) the EGC's together and connect them to the grounding screw on the metal box... that bonding jumper from the wirenut to the grounding screw... is that sized based on section 250.102(D)?... which is the equipment bonding jumper on the load side of an overcurrent device?

I don't see 250.148 mentioning the size, so I'm assuming you go back to 250.102(D).
Click to expand...
Yes, but that section send you back to 250.122. You do not use the table in 250.102 for this application.
 
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One easy way to remember is to use the largest EGC in the enclouser. Size your jumper to that. I like to install a ground bar if there is more than four. An example would be four tens three twelves and a number 8.
Now no jumper required. The enclouser is bonded by the largest EGC. That of course if they pull the right size. If not then use a bonding bushing and a jumper from that raceway to the new bar
 
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