Emt as a means of support

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OLDMAN2

Member
Does anybody know where in the nec it states that emt cannot be used as a means to support other luminaires? Such as a short section of emt tubing spanning across roof trusses and then running your luminaire support up to and from that span of emt. I have done this before for rc cans in a dropped ceiling (short pieces of emt) and on commercial jobs for chain supported flourescents where the room layout does not fall on a structural member.I have never had any inspectors fail me for this but have questioned the method with no code article cited.This is my first post,so any help would be appreciated.
 

iwire

Moderator
Staff member
Location
Massachusetts
You can use empty EMT for anything you want.

Once the EMT is part of a wiring method 300.11(B) prohibits using the EMT to support pretty much anything.
 

chris kennedy

Senior Member
Location
Miami Fla.
Occupation
60 yr old tool twisting electrician
In uses not permitted.

358.12 Uses Not Permitted.
EMT shall not be used under the following conditions:

(5) For the support of luminaires or other equipment except conduit bodies no larger than the largest trade size of the tubing.

Edit: What Mr D. said.
 

iwire

Moderator
Staff member
Location
Massachusetts
It sounds to me like he is taking about spanning trusses with empty tubing and supporting the fixture from that.

If that is the case IMO nothing in the NEC applies to it.
 

chris kennedy

Senior Member
Location
Miami Fla.
Occupation
60 yr old tool twisting electrician
It sounds to me like he is taking about spanning trusses with empty tubing and supporting the fixture from that.

If that is the case IMO nothing in the NEC applies to it.

After reading the OP again, yes it seems this is the case.

To play devils advocate, can you pull me up the engineered support specs for EMT?:D
 

roger

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Location
Fl
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Retired Electrician
After reading the OP again, yes it seems this is the case.

To play devils advocate, can you pull me up the engineered support specs for EMT?:D

Well, there are products made just for instances similar to this, Caddy is one manufacturer. :D


Roger
 

EBFD6

Senior Member
Location
MA
It sounds to me like he is taking about spanning trusses with empty tubing and supporting the fixture from that.

If that is the case IMO nothing in the NEC applies to it.

I agree with this. IMO EMT is only MT until you add wiring to it (E) or make it part of a wiring system, then it is EMT.

rules regarding the uses of MT are not found in the NEC.

you can use MT for anything you wish as long as it will physically carry the weight, my wife uses scrap EMT(-E) for staking her tomato plants.
 

Rockyd

Senior Member
Location
Nevada
Occupation
Retired after 40 years as an electrician.
Heck, you can use EMT for building racks! use the B-Line back-to-backs (part # BP-8-P-8) for 1/2" supported between cables, or all-threads, and away you go in commercial!

Footnote on the bottom of page says read safety/instruction sheets in packages before use....Must be the legalese attachment.
 
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infinity

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Location
New Jersey
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Journeyman Electrician
It sounds to me like he is taking about spanning trusses with empty tubing and supporting the fixture from that.

If that is the case IMO nothing in the NEC applies to it.


I agree too. It's nothing more than a tubular metal support system until conductors go into it.
 

OLDMAN2

Member
358.12 (5) is where i'm coming from, supporting other luminaires from emt tubing does'nt seem compliant, but i see it done all the time including myself. It seems to be the general concensus that this is o.k. Thanks all for the advice.
 
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