Luminaire Support

[Cow]

Going with what Larry said:

Install a 6' piece of strut spanning the trusses directly under the conduit. Use allthread and minnies pointing up to secure the conduit from the strut. Replace the conduit nipple in the fixture with a lighting hook, hang it from an eye bolt attached to the strut and whip into the fixture with cord from the T condulet. Problem solved.

 

[neutral]

It's hard to see in the photo, but the conduit is sagging some.

Steve

Everything will sag with age. I used to be 6' now I'm only 5' 10".

 

[steve66]

Steve,
It is the conduit supports on each side of the T that are the problem.

I'm with you now Don. But doesn't Exception #1 (2005 Code) eliminate the 18" requirement for RMC or IMC? I'm not sure if this exception was intended to include a conduit body that supports a light fixture, but that seems to be the way it reads.

Steve

 

[steve66]

While don brought the 18" in 314.23(F) I think we may have missed an easy one.

342.30(A) (IMC) or 344.30(A) (RMC)

Fastening conduit within 3' each conduit body or 5' where structural members do not readily permit fastening within 3'.

I don't know if it's 5' or more. To me it looks a bit off center and if the joists are 10' on center it could be more than 5'. But like said 18" is the distance they need.

I think that is the other section I was looking for and couldn't find. (I thought there was another paragraph about supporting boxes on the end of a conduit run. But I was still looking in 300 and 314.)

However, the trusses are only about 6' on center, so it easily complies with 342 and 344. IMO, these only require one support on one side of the fitting to be within 5'.

 

[benaround]

I'm with you now Don. But doesn't Exception #1 (2005 Code) eliminate the 18" requirement for RMC or IMC? I'm not sure if this exception was intended to include a conduit body that supports a light fixture, but that seems to be the way it reads.

Steve

Steve,

Ex#1 does not include a conduit body that also supports a light fixture. The words " light

fixture " are just not there, as they are in ex#2. IMO.

 

[steve66]

Steve,

Ex#1 does not include a conduit body that also supports a light fixture. The words " light fixture " are just not there, as they are in ex#2. IMO.

Yes, but it also doesn't say that the conduit body can't support a luminaire.

Anyhow, the basic rule - 314.23 (F) - generally refers to boxes and conduit bodies supporting fixtures (and other things). So again, I wouldn't expect the exception to repeat that it applies to support for light fixtures.

I don't think it is 100% clear - but I tend to lean a little toward Exception #1 allowing what was in the photo.

Steve

 

[don_resqcapt19]

I don't think Exception #1 changes the 18" part of the main rule. I think that all it does is permit the conduit to support a conduit body with a volume that exceeds 100 cubic inches as long as the conduit body is the same trade size as the conduit or it permits a single conduit to support a conduit body that has only one conduit entry. (don't think I have ever seen one like that)

 

[LarryFine]

. . . a conduit body that has only one conduit entry. (don't think I have ever seen one like that)

Now you have: http://www.tnb.com/ps/fulltilt/index.cgi?part=AE1

 

[don_resqcapt19]

Now you have: http://www.tnb.com/ps/fulltilt/index.cgi?part=AE1

Ok, so what would you use it for?

 

[LarryFine]

Ok, so what would you use it for?

I can't find any pics right now, but they used to make switches, receptacles, and lampholders that installed in them.