bonding bushing in place of locknut

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scottysolar

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on an emt fitting if the locknut will not allow the instalation of a plastic or metal bushing is it permissable to install a bonding bushing that locks up tightly in place of the locknut with the proper size conductor to the ground bar
 
Why would a locknut on an emt fitting not allow the installation of a bushing? Anyway, I say no. You need a locknut to secure the fitting. That's not the purpose of a bushing. I'm sure others will disagree. This has come up before.
 
There are some companies that make thinner locknuts. This must be galvinized pipe and there are'nt enough threads on the conduit.
 
I have seen EMT connectors that will not allow a bushing to be installed after the locknut is installed. As suggested you could try a thinner locknut or go with a connector with an insulated throat and forget the bushing altogether. If you really need a bonding bushing you may have a problem. :rolleyes:
 
you probably have a steel locknut they sometimes protrude outward. Try using die cast, they tend to be a little flatter.
 
infinity said:
I have seen EMT connectors that will not allow a bushing to be installed after the locknut is installed. As suggested you could try a thinner locknut or go with a connector with an insulated throat and forget the bushing altogether. If you really need a bonding bushing you may have a problem. :rolleyes:
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the insulated throat doesn't satisfy the #4 and larger requirement. Does it?
 
You don't have to use a lock nut, you can use just the bushing if it is not entirely made of insulating material.

See the last paragraph of 300.4(F)
 
iwire said:
You don't have to use a lock nut, you can use just the bushing if it is not entirely made of insulating material.

See the last paragraph of 300.4(F)[/QUOTE]

are you sure you ment 300.4(F)?

(F) Cables and Raceways Installed in Shallow Grooves. Cable- or raceway-type wiring methods installed in a groove, to be covered by wallboard, siding, paneling, carpeting, or similar finish, shall be protected by 1.6 mm (1/16 in.) thick steel plate, sleeve, or equivalent or by not less than 32-mm (11/4-in.) free space for the full length of the groove in which the cable or raceway is installed.
Exception No. 1: Steel plates, sleeves, or the equivalent shall not be required to protect rigid metal conduit, intermediate metal conduit, rigid nonmetallic conduit, or electrical metallic tubing.
Exception No. 2: A listed and marked steel plate less than 1.6 mm (1/16 in.) thick that provides equal or better protection against nail or screw penetration shall be permitted.
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acrwc10 said:
...are you sure you ment 300.4(F)?
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Likely he meant 300.4(G), last paragraph, first sentence:
Conduit bushings constructed wholly of insulating material shall not be used to secure a fitting or raceway.​
 
Smart $ said:
Likely he meant 300.4(G), last paragraph, first sentence:
Conduit bushings constructed wholly of insulating material shall not be used to secure a fitting or raceway.​
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Bingo, Thank you, it depends on what year NEC.:smile:
 
tyha said:
the insulated throat doesn't satisfy the #4 and larger requirement. Does it?
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300.4(G) Insulated Fittings. Where raceways contain 4 AWG or larger insulated circuit conductors and these conductors enter a cabinet, box, enclosure, or raceway, the conductors shall be protected by a substantial fitting providing a smoothly rounded insulating surface, unless the conductors are separated from the fitting or raceway by substantial insulating material that is securely fastened in place.
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Sounds like an insulated throat to me.
 
is a bonding bushing listed for bonding and grounding or just grounding
the inspector says listing is for grounding not bonding in place of the emt locknut
 
scottysolar said:
is a bonding bushing listed for bonding and grounding or just grounding
the inspector says listing is for grounding not bonding in place of the emt locknut
Click to expand...

It is one and the same in this case. The EI is really reaching for something that is not there.
 
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