Luminaire Supported by Conduit

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bcorbin

Senior Member
Referring to NEC 2002, 314.23.F, Exception (d):

A luminaire (fixture) supported by a single conduit does not exceed 300mm (12 in.) in any direction from the point of conduit entry.

Can anyone clarify this for me?

I have a client I am doing some high bay fixtures for. Typically, I chain mount the fixture to the structural steel, and cord-and-plug them to a receptacle mounted on the ceiling.

The client sketched me up something he wants that looks like a box on the ceiling, rigid conduit hanging down to what is called a "pendant power box" (option available from Lithonia), upon which the fixture is hung from a very short chain (6", approx). The pendant power box has a receptacle for the fixture to plug into.

Knowing Exception (a) limits the conduit to 36" max length, and Exception (e) limits the fixture and power box to a total of 20 lbs., does Exception (d) mean no part of the luminare can extend outside a 12 inch sphere centered at the junction of the power box and conduit?

While the lighting fixture is not attached to the conduit, it is definitely "supported" by it, so I would figure it would be a violation.
 
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831

Senior Member
Location
South Jordan, Utah
Reading the 2005 version of 314.23(F), I don't know why you need to go any further than (F) Exception 1.

The PPH has just (1) threaded hub and therefore I would think you could stop your search w/ Exception 1. I say Exception 1 because (F) requires (2) or more conduits to support. Exception 1 allows for GRS to be threaded into the PPH and done.

$0.02
 
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bcorbin

Senior Member
831 said:
Reading the 2005 version of 314.23(F), I don't know why you need to go any further than (F) Exception 1.

The PPH has just (1) threaded hub and therefore I would think you could stop your search w/ Exception 1. I say Exception 1 because (F) requires (2) or more conduits to support. Exception 1 allows for GRS to be threaded into the PPH and done.
Click to expand...

Exception No. 1 says a "conduit body" can be supported.

Exception No. 2 applies to luminaires and boxes (the PPH) used for luminaire support. However, upon further inspection, it does say "unbroken length(s)" of conduit. The "length(s)" says to me a single conduit is allowed, but my other issues of length and size would remain violations.

Any more opinions would be greatly appreciated.
 
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