Bonding of Nipple

Status
Not open for further replies.
H

H-TAP

Member
does the rigid nipple between a meter enclosure and a service disconnect required to have a bonding bushing on both sides of the nipple? can you provide code reference to this.

[ April 18, 2005, 07:19 AM: Message edited by: H-TAP ]
 
Re: Bonding of Nipple

Not sure if there is a specific code reference to this, but in the handbook there is an exhibit (in the gorunding section, dont have my book handy) that shows a nipple between a wireway and service enclosure and the nipple is bonded on only one end. Dont forget that bonding is required on both ends if the nipple encloses a GEC.
Regards.
 
Re: Bonding of Nipple

i thought only one end needed to be bonded, but the AHJ said that the nipple must be bonded on both ends.
 
Re: Bonding of Nipple

The bonding bushing is to bond the nipple to the grounding system. Why would you need to connect it twice?

Do we have to bond switches twice? Receptacles? :D
 
Re: Bonding of Nipple

Originally posted by H-TAP:
i thought only one end needed to be bonded, but the AHJ said that the nipple must be bonded on both ends.
Click to expand...
Your Code Inforcement Official may be refering to Article 250.92 Services.(NFPA 70,2005 Page 70-106

(a)Bonding at Services
(a)(2)-( meter fittings )-

250.92(b)(4)

Bonding jumpers meeting the other requirements of this article shall be used around conccentric or ecentric knock-outs that are punched or otherwised formed so as to impair the electrical connection to ground.Standard locknuts or bushings shall not be the sole means for the bonding required by this section
 
Re: Bonding of Nipple

I just had a service taged today for this. :mad:
We had a bonding bushing conductor in the meter side that connected to the lug next to the neutral (they are part of the same buss that is also connected to the meter can) on the main breaker panel side of the nipple the electrician installed another bonding bushing conductor but connected it to a grounding bar that is mounted seperatly from the neutral bar that is connected to the panel cabnet by screws.
The neutral bar has the MBJ installed in it. He sited 250.92(B)(1) as the reasone for the rejection as it say's:

250.92(B)(1) Bonding equipment to the grounded service conductor in a manner provided in 250.8
Click to expand...
When I tried to explain that it is only required to bond the service conduit once, he sited 250.92(A)(1) and (2):

250.92(A) Bonding of Services. The non?current-carrying metal parts of equipment indicated in 250.92(A)(1), (2), and (3) shall be effectively bonded together.
(1) The service raceways, cable trays, cablebus framework, auxiliary gutters, or service cable armor or sheath except as permitted in 250.84.
(2) All service enclosures containing service conductors, including meter fittings, boxes, or the like, interposed in the service raceway or armor.
Click to expand...
He's saying that to be effectively bonded together both ends have to be bonded? And he is including the service panel in this as it does enclose service conductors.?

I find no purpose for the second connection in the panel as any fault current will return to source which will be to the bond in the meter enclosure to the service grounded conductor.

And that 250.92(B) clearly say's
shall be ensured by one of the following methods :
Click to expand...
Not two! also 250.92(A)(3) clearly shows when it is required to bond both ends.

He just didn't wan't to budge! :mad:

[ April 18, 2005, 07:13 PM: Message edited by: hurk27 ]
 
Re: Bonding of Nipple

There are many reasons why some do not understand or know the code requirements.
One very important aspect is not really understanding what the code requirement is in place for.

If the bonding you mention included one bushing, and bonding to the enclosure at the other end of the conduit, then he clearly does not understand the purpose of bonding.

I still say the best defense against a poor inspector is having knowledge of the code and a code book on the job.... maybe some hutspah too :D
 
Re: Bonding of Nipple

Hurk i hear your frustration also. The first time i had this happen with an inspector i was also very frustating for me. Thersfore what I do on all service is use a bonding locknut in the meter can and a bonding bushing in the panel. Not required but for those inspectors who wont budge problem is solved.
 
Status
Not open for further replies.
Top