fluorescents....jack chain....and mc cable

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peter d said:
Could it really though? You have to move a #12 solid an awful lot to get it to break.
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The thing I dont get is that if the fixture is moving so is the mc tyraped to the jack chain, I dont see any part of the MC getting stressed.
 
peter d said:
Could it really though? You have to move a #12 solid an awful lot to get it to break.
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Look at it the other way.

Your the CMP, do you try to estimate 'how many licks it takes to get to the center' or do you just say 'use stranded'?

Using stranded is not a costly hardship. Heck you can get stranded MC. :smile:
 
stickboy1375 said:
The thing I dont get is that if the fixture is moving so is the mc tyraped to the jack chain, I dont see any part of the MC getting stressed.
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At the transition from the chain to the building?

But you are all right, I don't know the intent.:smile:
 
iwire said:
Your the CMP, do you try to estimate 'how many licks it takes to get to the center' or do you just say 'use stranded'?

Using stranded is not a costly hardship. Heck you can get stranded MC. :smile:
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Well the CMP could have made an exception to the rule for chain hung luminaires fed with MC cable. :D

As for using stranded MC or flex, that's more material to order and stock, more labor in the case of flex, etc....just thinking out loud here. I can see the rationale here, but it doesn't really make any sense.
 
Here's my take on the subject.

1. The title of the section V1 is wiring 'of ' fixtures, not wiring 'to' fixtures.

2. In every article of section V1 the term(s) ' circuit conductors ' or ' branch

circuit ' , are used when those conductors are refered to.

3. When 410.28(E) states --' wiring ' on ' fixture chains ' in my opinion it is

a stretch to include jack chain in that catagory.
 
I happen to agree with Bob (Iwire) with this one.

Forget intent, how would one know what the intent really is/was?

The wording that I am seeing is:
" Stranded conductors shall be used for wiring ON luminaire (fixture) chains and ON other movable or flexible parts."

Where does this say "through" chains? Where does it say that "jack" chain is not included in the requirement?

This sub-section is pretty wide open for many different types of installations with fixtures.
 
iwire said:
I don't see that section limited to that application.

In my opinion it also applies the conductors dropping down from the structure to chain hung strip lights.

FWIW in the 2008 it has moved to 410.56(E).
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I agree,I/ve learned something today on this type of wiring method,never really thought of it,I/m very happy I/ve joined the forum,unfortunately I do not have alot of time to be on it...
 
This is just rediculous what kind of party does it have to be to be swinging on the chain hung fixtures. They move once upon installation and then they just hang there for 30 years or so. Hey the bar joists move a little under a snow load and in a heavy wind so we shouldnt use it there either.
 
quogueelectric said:
This is just rediculous what kind of party does it have to be to be swinging on the chain hung fixtures. They move once upon installation and then they just hang there for 30 years or so. Hey the bar joists move a little under a snow load and in a heavy wind so we shouldnt use it there either.
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I've seen some near air vents that sway continually.
I would have never thought that section applied to the OP's situation, but how many things in the Code cover that 1 in 100 possibility. We can all guess intent, but the question may only be resolved thru ROPs or input from a CMP memeber.
 
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