Does anyone know of a code ruling that specifically allows or prevents FPL cable and THHN installed in the same conduit? Specifically in the following circumstance, I am using 18/2 FPLR twisted shielded cable for my addressable loop (SLC)which is power-limited, and #12 THHN conductors for my Audible/Visual devices (NAC)circuits which are also power-limited? I have researched and debated this topic with my co-workers and the code (NEC 760) seems vary vague on this subject and left up to interpretation, depending on which siden of the topic you are supporting. I would love to your opinions and Article #'s that support them. Thank you for your help on this!
FPL Cable and THHN in same raceway?
- Thread starter sptiner
- Start date
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- Illinois
- Occupation
- retired electrician
Re: FPL Cable and THHN in same raceway?
sptiner,
The rules on seperation of power limited fire alarm cables from other conductors or cables appears in 760.55. Your application is not prohibited by this section. It appears that your application is premitted by 760.56.
Don
sptiner,
The rules on seperation of power limited fire alarm cables from other conductors or cables appears in 760.55. Your application is not prohibited by this section. It appears that your application is premitted by 760.56.
Don
Re: FPL Cable and THHN in same raceway?
Don,
Thank you for the reply. Although, are you using the 2002 Code? Our AHJ's are still on 1999. The section your referring is 760-54 (99 edition). My interpretation is the same, that it is allowed, although some of my co-workers don't believe so. I'll have to show them the post, as I am unable to argue their side.
Don,
Thank you for the reply. Although, are you using the 2002 Code? Our AHJ's are still on 1999. The section your referring is 760-54 (99 edition). My interpretation is the same, that it is allowed, although some of my co-workers don't believe so. I'll have to show them the post, as I am unable to argue their side.
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