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#84943 - 05/18/03 08:37 AM bond bushing  
gserve  Offline
Member
Joined: Mar 2003
Posts: 92
Do you need a bond bushing when using a offset nipple if 1 end is threaded into a myers hub? The offset nipple is installed between the bottom of a meter socket and the top of a disconnect.


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#84944 - 05/18/03 07:08 PM Re: bond bushing  
resqcapt19  Offline
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Joined: Nov 2000
Posts: 2,148
IL
Given the fact that Myers makes a grounding hub, I think that you will need something more than the standard Myers hub. This bonding is only required by the code at one end of the nipple, but some utilities require both ends to be bonded.
Don


Don(resqcapt19)

#84945 - 05/18/03 09:18 PM Re: bond bushing  
Redsy  Offline
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Joined: Mar 2001
Posts: 2,056
Bucks County PA
If no leftover KOs remain, you can use a grounding locknut. If some remain, a bonding bushing would be required.
250.92(A)


#84946 - 05/18/03 10:22 PM Re: bond bushing  
Steve T  Offline
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Joined: Feb 2001
Posts: 306
Oak Park, IL, USA
Has anyone come up with the final determination on the Myer's hub grounding acceptability for bonding ahead of the main?

I know this was the topic of separate thread, but I never checked to see if anyone came up with a final answer on this.

I wouldn't call the locknut on a Myer's hub a 'standard' locknut. And disregarding concentric KO's the surface area a Myer's hub makes to an enclosure is probably just as much if not more than using a bonding bushing. Not to mention most electricians don't make the connections tightly enough on bond bushings quite often--a mistake less likely and easier to determine during inspection with a Myer's Hub.


#84947 - 05/24/03 09:00 AM Re: bond bushing  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
The opening post said

Quote
"installed between the bottom of a meter socket and the top of a disconnect."


That being the case the nipple contains service entrance conductors, grounding bushings are required regardless of KOs left or not.

2002 NEC
250.92(A)(1) and (2)
250.92(B)(1) and (4)

From the 2002 Handbook regarding
250.92(B)(4)

Quote
Note that method (4) requires other similar devices, such as bonding-type locknuts or bushings. Standard locknuts or sealing locknuts are not acceptable as the “sole means” for bonding on the line side of service equipment.


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#84948 - 05/28/03 11:38 PM Re: bond bushing  
Steve T  Offline
Member
Joined: Feb 2001
Posts: 306
Oak Park, IL, USA
A bonding locknut can be used for grounding service conduits ahead of the main.

They can't be used if there are KO's left because the angled screw on the locknut sets into the concentric KO's and not a solid piece of metal on the enclosure.

Anyone get an answer from UL or manufacturer yet?

I also would like to mention that a bond bushing will not fit far enough onto the threads of a Myer's Hub in order to properly set the set screw into the threads.


#84949 - 05/29/03 12:49 AM Re: bond bushing  
DJF  Offline
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Joined: May 2003
Posts: 17
Steve T
I believe if you re-read the 2nd from top post, you will find your answer to your question concerning bonding the Meyers Hub.

Hope this helps.


#84950 - 06/01/03 10:41 PM Re: bond bushing  
Steve T  Offline
Member
Joined: Feb 2001
Posts: 306
Oak Park, IL, USA
DJF,

If a company makes more than one type of compliant service bonding method (fitting) it doesn't necessarily mean one is listed for grounding and one is not. I'm sure there are manufacturers who make grounding bushings and grounding locknuts which are both listed fittings.


#84951 - 06/02/03 12:25 AM Re: bond bushing  
DJF  Offline
Member
Joined: May 2003
Posts: 17
Steve T
The point you make is very valid and well taken. I just assumed that resqcapt19 saying "I think that you will need something more than the standard Meyers hub." indicated that the standard Meyers hub was not suitable for Service Equipment bonding.



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