Meyers Hubs.......

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chevyx92 said:
Do you need to use a grounding bushing with a meyers hub if they contain service conductors?
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If you are terminating a service raceway, to a meyers hub, that terminates in its own knockout, then you are required to bond the raceway in accordance with 250.92(B).

A grounding bushing is not necessarily required. A bonding type locknut, a bushing with a bonding jumper, or other listed means may be substituted.
 
ibew441dc said:
If you are terminating a service raceway, to a meyers hub, that terminates in its own knockout, then you are required to bond the raceway in accordance with 250.92(B).

A grounding bushing is not necessarily required. A bonding type locknut, a bushing with a bonding jumper, or other listed means may be substituted.
Click to expand...

I'm talking about a meyers hub into the top of a raintight troff(no concentric KO's), and pvc connectors out of the meyers hub. So you say I need a grounding bushing on the meyers hub connector? I always thought the serated locknut thats on the meyers hub provided adequate bonding, since it digs into the enclosure when tightened.
 
chevyx92 said:
I'm talking about a meyers hub into the top of a raintight troff(no concentric KO's), and pvc connectors out of the meyers hub. So you say I need a grounding bushing on the meyers hub connector? I always thought the serated locknut thats on the meyers hub provided adequate bonding, since it digs into the enclosure when tightened.
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Did you read 250.92(A) & (B)?
 
I can understand the question here. The locknut on a hub does not look like a standard locknut. It is not one of the items specifically list in the code for service bonding but it also is not a standard lock nut.

In this application (PVC adapter screwed into the hub) I would have no issue with using the hub without any other means. If the raceway used with the hub was metallic, I would require additional bonding. The easiest would be to use a hub with a bonding connection on the locknut.
 
Pierre C Belarge said:
I was not going to address this, trying to stay with 250.92, but...is a metallic Meyers hub permitted to be installed with a PVC raceway?
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I would say yes. They dont make a PVC Myers Hub. The myers hub is just to make rain tight when bringing a coduit into the top of a hubless outdoor enclosure. If the trough is used for taps, then you must bond it with EGC
 
ibew441dc said:
If you are terminating a service raceway, to a meyers hub, that terminates in its own knockout, then you are required to bond the raceway in accordance with 250.92(B).

A grounding bushing is not necessarily required. A bonding type locknut, a bushing with a bonding jumper, or other listed means may be substituted.
Click to expand...

I agree but 250.92 refers to standard Lock Nuts. Is a standard LN one without a bonding set screw or our there manufactures that makes non-standard LN?s? What is a non-standard LN? I?m not sure whether lock nuts are listed?

View attachment 3078
 
chevyx92 said:
I'm talking about a meyers hub into the top of a raintight troff(no concentric KO's), and pvc connectors out of the meyers hub. So you say I need a grounding bushing on the meyers hub connector? I always thought the serated locknut thats on the meyers hub provided adequate bonding, since it digs into the enclosure when tightened.
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Cheaper to use seal ring than myers hub... eliminates any question about bonding PVC :)

 
chevyx92 said:
I'm talking about a meyers hub into the top of a raintight troff(no concentric KO's), and pvc connectors out of the meyers hub. So you say I need a grounding bushing on the meyers hub connector? I always thought the serated locknut thats on the meyers hub provided adequate bonding, since it digs into the enclosure when tightened.
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Got a question. Why are you worrying about the hub being a suitable bond? if PVC is coming into the hub, you still need an EGC or sre you worrying about the hub itself being bonded?
 
slick 50 said:
Got a question. Why are you worrying about the hub being a suitable bond? if PVC is coming into the hub, you still need an EGC or sre you worrying about the hub itself being bonded?
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This is a service raceway, there will be no EGC at this point in the system.
 
Is the sealing ring is list to be used with PVC TA? Thomas and Betts show it for use with RMC and IMC. Sealing locknuts are the same too.

http://www.tnb.com/ps/fulltilt/index.cgi?part=5307

Along the same lines is this from IAEI that says, "All hubs are intended for use with threaded conduit, not fittings."

http://www.iaei.org/magazine/departments/ulquestion_html/06culq2.html

Interesting though is the brochure for T&B raintight EMT fittings shows it enter a hub on a rain tight box and a bell box. I know a Myers Hub is tapered thread, I would think a hub as shown and a bell box would would be tapered to.

I know the article is a little old but I would think it is still valid.
 
Nice One!

Nice One!

maloo said:
Is the sealing ring is list to be used with PVC TA? Thomas and Betts show it for use with RMC and IMC. Sealing locknuts are the same too.

http://www.tnb.com/ps/fulltilt/index.cgi?part=5307

Along the same lines is this from IAEI that says, "All hubs are intended for use with threaded conduit, not fittings."

http://www.iaei.org/magazine/departments/ulquestion_html/06culq2.html

Interesting though is the brochure for T&B raintight EMT fittings shows it enter a hub on a rain tight box and a bell box. I know a Myers Hub is tapered thread, I would think a hub as shown and a bell box would would be tapered to.

I know the article is a little old but I would think it is still valid.
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Thanks for the info...........I'm going to check this out in more detail.:smile:
 
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