Surprise! NFPA/NEC Permits Cable In HVAC Ducts For Specific Fire Alarm Applications
I was wrong, and I'm passing this info on to help you be more accurate in your debates because I have heard this echoed on these forums. We cover this topic in Riser vs Plenum Cabling Explained.
I was arguing with a structured cabling designer about the NEC (National Electrical Code, NFPA 70) prohibition on using HVAC ducts as raceways for cable.
*** ****** *** ** ** ******* is **** ****** *** ***** **** to **** ***** ** * ********. Think ** **** ** ****, *** fuses ** ** ******-**** ***********. **** can ** *********** ** ******** ******/***** very *******. **** ******-***** ****** *** be ***** ** *** ******** ****** is ********** ******.
** ***** ****** ***** *** **** in ************** ** ** ******. * learned ****, ******** ** **** *******, it ** *** ****** ******. *******: Permissions *** ********* ******* *** *********** to **** *****/***** *******.
*** ***.**(*) ****** *** ******* ***** inside *****, ******. ***, *** ****** is ******* ** '* **** ***,' and ** **** ** ****** *****:
***.**(*) ***** ************ ********** *** ************* Air.
*********: ****** ******* *** ******* *******, listed *** *** ** ***** ****** used *** ************* *** (*******), ***** be ********* ** ** ********* ** ducts ************ ********** *** ************* ***-******** purposes ***** *** ********* **********:
(*) *** ****** ******* ** ******* systems ***** ** ********* **** ** necessary ** ******* ** ********* ** devices ********** **** *** ****** ****** upon ** ******* ** *** ********* air, ***
(*) *** ***** ****** ** **** wiring ******* ** ******* ******* ***** not ****** *.* * (* **).
** ***** ** ************* ** ****** the '*' ** ******* **** ** buddy *** **** *** *** **** fate. :)
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*'* *** ****'* * ************ **** than ******** ******* ** *** ******** it **. **** **** *** *** it *** ** ** *** **** devices. ** ** *** ****** ******* of ******* ***** ******* **** *** any ***** ******* *** *** *******. I'd ** ***** ****** ** * claimed **** ** * ****** ***** tech * ***** *** **** ** CAT ******* * ********'* **** *** return ** ******* **** **** ******* to ** ********* ********** ********.
*** ******** **'* * ***** *******, an **** ****** ******'* ** ** "oxygen ****" ***********; *** ****** ******* of *** *****'* ******. **'* **** in ****** *** ** **** *** able ** **** ****** ** * flame **** ******* ** **** ** spread **.
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*********, **** ** *** ********* ** NEC: