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#99512 - 05/26/06 09:59 PM liquidtight
victor Offline
Junior Member

Registered: 05/27/06
Posts: 3
Loc: Las Vegas
Hi I would like to know where in the NEC talks about using liquidtight conduit to connect a dry type transformer because fo vibration. Thank you

2014 / 2011 NEC & Related Books and Study Guides
#99513 - 05/27/06 04:41 AM Re: liquidtight
iwire Offline

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
Welcome to the forum victor.

You will not find anything in the NEC requiring liquidtight conduit to be used to connect a dry type transformer because of vibration.

It is just a design choice buy the installer.
Bob Badger
Construction & Maintenance Electrician

#99514 - 05/27/06 12:03 PM Re: liquidtight
renosteinke Offline
Cat Servant

Registered: 01/22/05
Posts: 5305
Loc: Blue Collar Country
I'll go a bit farther...

True, the NEC does not address the matter. However, NECA standards document the use of flex at transformers as "trade practice", or good workmanship.

That aside, I noticed recently that some transformers have internal rubber mounts, so the piping actually does not connect to the part that vibrates.

I still like to see flex at the case, though. Old habits die hard.

#99515 - 05/30/06 07:40 PM Re: liquidtight
victor Offline
Junior Member

Registered: 05/27/06
Posts: 3
Loc: Las Vegas
hi thank you for your reply, where can I get a copy of NECA stating the use of liquid flex as a good workmanship. Thank you


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