MC Cable touching Sprinkler All-thread support

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kyleapec

kyleapec

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siloam springs arkansas
I failed an above ceiling, because the mc cable was touching the all-thread supporting the sprinkler pipe, not the sprinkler pipe itself, but the all-thread down from the structure. I have never heard of this. Two questions, is there an NEC violation here? Secondly, I am not familiar with sprinkler code or the NFPA is there a possible violation there?
 
Unless there is some odd ball spec there is nothing wrong with touching another trades support rod or wire. There are systems that you can not share supports with but this was not the case.

Roger
 
I agree with Roger, nothing in the NEC or NFPA 13 says this was a violation, but I will say that inspectors are really over zealous when any thing to do with sprinklers or fire alarms are involved IME.
 
The following is from NFPA 13 but it does not sound like you situation would really qualify. This is not a USACE job is it?

9.1.1.3.1.5 Systems that are incompatible with the fire sprinkler systems based on vibration, thermal expansion and contraction, or other factors shall not share support structures.
 
That is what I suspected and I appreciate the input. Alas, I am not well versed in anything outside of the NEC, besides old timers rules of thumbs. I suspect he was thinking along the lines of us supporting off of them, but we were not tied off or supported by them just touching. Thanks again.
 
kyleapec said:
That is what I suspected and I appreciate the input. Alas, I am not well versed in anything outside of the NEC, besides old timers rules of thumbs. I suspect he was thinking along the lines of us supporting off of them, but we were not tied off or supported by them just touching. Thanks again.
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Just touching then there is no NEC issue.
 
Many inspectors get hung up on dissimilar metals and think that it can't touch anything having to do with the water system. Since most sprinkler systems aren't bonded he may have been thinking that if there was a short in the cable it could travel down to the sprinkler pipe. Usually, but not always there is a rubber grommet in the hanger.

Now that being said, I've always asked, "then why don't we bond the suspended ceiling and the metal wall studs?"

Just MHO
 
cowboyjwc said:
Many inspectors get hung up on dissimilar metals and think that it can't touch anything having to do with the water system. Since most sprinkler systems aren't bonded he may have been thinking that if there was a short in the cable it could travel down to the sprinkler pipe. Usually, but not always there is a rubber grommet in the hanger.

Now that being said, I've always asked, "then why don't we bond the suspended ceiling and the metal wall studs?"

Just MHO
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They're supposed to be if there is an NFPA 780 lightning protection system installed; see 10.6.8.and 10.6.8.1 in NFPA 13.
 
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