Bonding bushings

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101010

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Paralleled service feeders that enter a trough before they enter the panel. Should there be a bonding bushing on the pipes entering the trough and the pipes entering the panel? or just the panel? in the panel only one pipe needs to have bonding bushing right?
 
If there are NO eccentric or concentric knockouts, are bonding bushings or locknuts required? :? This still is confusing to me!:?:? Code article please. Thanks
 
OK Dennis, but if it is for a residence 120/240 single phase, would they be required by code? One co-op in this area wants them on everything on a 320 amp service! :huh:
 
JDB3 said:
OK Dennis, but if it is for a residence 120/240 single phase, would they be required by code? One co-op in this area wants them on everything on a 320 amp service! :huh:
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You cannot fight the Utilities. If they want it then do it but the code does not require it necessarily. I have always seen bonding bushing used and in fact some reducing washers are listed for use for bonding.
 
JDB3 said:
OK Dennis, but if it is for a residence 120/240 single phase, would they be required by code? One co-op in this area wants them on everything on a 320 amp service! :huh:
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One end of all metallic service conduits require something other than standard locknuts to bond them. 250.92(B)
 
All metallic raceways and enclosures containing service conductors must be bonded by one of the methods listed in 250.92(B).
Your pipes entering the trough can not depend on standard locknuts and bushings for bonding.
If all you are doing is bonding the raceway, then a accepted bonding means on either end of all raceways is is acceptable.
If you are depending on the raceways to bond the trough, then both ends of the raceway must have an acceptable bonding method.
 
augie47 said:
All metallic raceways and enclosures containing service conductors must be bonded by one of the methods listed in 250.92(B).
Your pipes entering the trough can not depend on standard locknuts and bushings for bonding.
If all you are doing is bonding the raceway, then a accepted bonding means on either end of all raceways is is acceptable.
If you are depending on the raceways to bond the trough, then both ends of the raceway must have an acceptable bonding method.
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Much better explanation than I gave. :thumbsup:
 
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