Short nipples

[electrofelon]

Hers an example.
I don't like it.

A strut clamp is about 1 5/8 wide.....whatcha gunna do??

 

[Tulsa Electrician]

Put a second locknut on the right outside of panel and wrench it tight.

 

[DrSparks]

In order to bond the conduit to the enclosure, the means of securing the conduit to the panel need to have a mechanism that cuts through the paint into the metal. Double lock nuts achieves this. If a ground bushing is listed for this purpose then you'd only need a locknut on the outside.

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[Carultch]

In order to bond the conduit to the enclosure, the means of securing the conduit to the panel need to have a mechanism that cuts through the paint into the metal. Double lock nuts achieves this. If a ground bushing is listed for this purpose then you'd only need a locknut on the outside.

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Unless it is a plastic enclosure and bonding is not applicable.

That aside, fittings like EMT connectors only have one locknut and a shouldered fitting. It seems to follow the same reasoning of achieving both mechanical and electrical continuity, that one locknut on the outside against a metal bushing on the inside would achieve exactly the same results.

 

[elecwiz]

I've always used 4 locknuts on a closed nipple with bonding bushings if before the first means of disconnect and then after the first means of disconnect a closed nipple with 4 locknuts and two plastic pull bushings or when butted up against my enclosure a chase nipple with a locknut and plastic bushing
If there are not enough threads get or make a longer nipple by cutting a longer nipple with band saw and thread files.Thats how I was taught.

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[DrSparks]

I've always used 4 locknuts on a closed nipple with bonding bushings if before the first means of disconnect and then after the first means of disconnect a closed nipple with 4 locknuts and two plastic pull bushings or when butted up against my enclosure a chase nipple with a locknut and plastic bushing
If there are not enough threads get or make a longer nipple by cutting a longer nipple with band saw and thread files.Thats how I was taught.

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I wasn't aware we were talking about plastic enclosures lol. In that case you'd need bonding bushings connecting the EMTs together with jumpers.

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[hbiss]

In order to bond the conduit to the enclosure, the means of securing the conduit to the panel need to have a mechanism that cuts through the paint into the metal. Double lock nuts achieves this. If a ground bushing is listed for this purpose then you'd only need a locknut on the outside.

Bingo! Add to that, only one locknut relies on however the enclosure is secured or fastened for the one locknut to be held in contact with the enclosure. Over time screws loosen and the enclosure can shift. With two locknuts that can't happen.

-Hal