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Service raceway, or not? #78089 08/15/01 08:36 PM
Joined: Mar 2001
Posts: 2,056
R
Redsy Offline OP
Member
Using an offset nipple between a meter socket and an outdoor service disconnect would require a bonding bushing where some eccentric KO rings are left intact. The nipple is considered part of a service raceway. Correct?

2017 / 2014 NEC & Related Books and Study Guides
Re: Service raceway, or not? #78090 08/15/01 09:07 PM
Joined: Nov 2000
Posts: 2,236
sparky66wv Offline
Member
I would tend to think so, at least, that's the way I interepret it...


-Virgil
Residential/Commercial Inspector
5 Star Inspections
Member IAEI
Re: Service raceway, or not? #78091 08/15/01 10:17 PM
Joined: Jan 2001
Posts: 75
G
Glenn Offline
Member
I interpret 250-80 requires this offset nipple to be bonded.

250-94(4) suggests bonding bushing or set-screw locknut.

Only one end of the metal "service" raceway needs to be so bonded.

If concentric KO's are encountered, bond both ends. Or at least the end that has any concentric KO's.

Glenn

Re: Service raceway, or not? #78092 08/15/01 11:18 PM
Joined: Oct 2000
Posts: 3,961
Bill Addiss Offline
Member
I find it much less trouble to just use Pvc when possible. If a metal nipple was used here We would have to bond with a #6 solid Insulated (not taped) Green conductor. Try and buy that wire in a pinch.

[Linked Image]
Bill


Bill
Re: Service raceway, or not? #78093 08/15/01 11:24 PM
Joined: Nov 2000
Posts: 2,236
sparky66wv Offline
Member
That, and my PoCo doesn't want any bonding bushing or #4 bare in their meterbase...

I use PVC too...


-Virgil
Residential/Commercial Inspector
5 Star Inspections
Member IAEI
Re: Service raceway, or not? #78094 08/15/01 11:33 PM
Joined: Dec 2000
Posts: 4,283
electure Offline
Member
I don't believe that the bonding locknut is acceptable with concentric knockouts that have portions of the KO's remaining. It doesn't serve any more purpose than would a standard conduit locknut in this case.

Re: Service raceway, or not? #78095 08/17/01 11:04 AM
Joined: Nov 2000
Posts: 246
R
rmiell Offline
Member
Bonding of this nipple (I assume it is not connected to a hub at one end, in the case of the meter socket above an outdoor rated panel) is required even if there is no concentric ko's. If it attached via a hub, no special bonding is required. If power companies don't want you in their sockets, and you need to bond it, either install a meyers hub on the panel, or install a grounding bushing inside your panel, or use a pvc nipple. Just make sure to bond the pvc with a nylon jumper!(ha-ha)

Rick Miell

Re: Service raceway, or not? #78096 08/17/01 01:02 PM
Joined: Nov 2000
Posts: 2,148
R
resqcapt19 Offline
Member
It only needs to be bonded at one end, so there is no need to install something in the meter can that the utility doesn't want there.
Don(resqcapt19)


Don(resqcapt19)
Re: Service raceway, or not? #78097 08/17/01 01:38 PM
Joined: Jul 2001
Posts: 40
G
glenn35 Offline
Member
I was unaware that there needed to be a bond to a nipple. I have connected service to thousands of customers and have never seen any sort of bonding at all to a nipple. The only thing I was ever taught to look for is the plastic bushings that protects the wire from rubbing the edge of the nipple. Even in the city (Houston) where they have inspectors and require permits I have not seen this practice.

Also what good would it do if it were only bonded on one side(breaker box). If the meter-can has knockouts then how would there be true continuity tying the two boxes together? Seems like a waste of time to only install a bond to one side. But as was stated by someone earlier, the utility does not allow "any grounds" in there meter can. As also we do not either.

Without the nipple having a true bond between the boxes has helped me to troubleshoot some neutral problems. If the neutral connection was ever lost in the breaker box then the load would try to use the nipple to conduct. If not bonded then it begins to spark/burn around the KO where the nipple makes contact with the box. It has gotten to a point now where I look for this tell tale sign whenever the cust mentions dim lights.

Re: Service raceway, or not? #78098 08/17/01 02:52 PM
Joined: Oct 2000
Posts: 3,961
Bill Addiss Offline
Member
glenn35,

Maybe it's a local thing. Here, the PoCo even made the manufacturers add a separate lug to the Meter Pan to accomodate this bonding wire. I don't know for sure if they'd call for bonding in all situations though. When they stopped allowing the wire to be taped green I went for PVC and haven't looked back. [Linked Image]

Bill


Bill
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