Threaded nipple between two panels

[sticko]

I have always been under the assumption that using a two inch threaded nipple between two panels was not prohibited. The nipple is 3 to 3 1/2 inches long and there is aout 1 1/2 inches of exposed thread between panels. The panels are installed in an indoor electric room without heat but cooled. I don't think there is a problem with rust or corrosion, more of a bonding issue. What do all of you think?

 

[steve66]

I have always been under the assumption that using a two inch threaded nipple between two panels was not prohibited. The nipple is 3 to 3 1/2 inches long and there is aout 1 1/2 inches of exposed thread between panels. The panels are installed in an indoor electric room without heat but cooled. I don't think there is a problem with rust or corrosion, more of a bonding issue. What do all of you think?

It seems like it would be OK if you had double locknuts on each panel. But I'm curious what the electricians have to say about it.

 

[sticko]

Yes I failed to state that there are locknuts on both sides of each panel.

 

[jumper]

Are service conductors installed in the nipple?

 

[jaggedben]

There is nothing that prohibits using a threaded nipple between two panels. That's what they're for.

In many cases, depending on what you have running through it, you will need to bond it with bonding bushings or the equivalent.

 

[infinity]

Is it a short nipple with threads only on the ends or a running thread (all thread)? Either one is permitted between two panels as you've described.