Fire alarm sharing conduit with low voltage
- Thread starter Pinnie
- Start date
gadfly56
Senior Member
- Location
- New Jersey
- Occupation
- Professional Engineer, Fire & Life Safety
I'm assuming we are talking about Class 2 and Class 3 circuits. You're looking for 725.139 in the 2023 edition of NFPA 70. As long as the insulation has the same voltage rating, you're good to go.
- Location
- New Jersey
- Occupation
- Journeyman Electrician (retired)
That looks like a sleeve so you can run any cable you want through it even line voltage.
even line voltage?
Strathead
Senior Member
- Location
- Ocala, Florida, USA
- Occupation
- Electrician/Estimator/Project Manager/Superintendent
What he means is like an MC cable or a Romex. Basically a wiring method allowed in Chapter 3 of the NEC. The sleeve is really nothing but a hole in the wall.
- Location
- New Jersey
- Occupation
- Journeyman Electrician (retired)
Yes that's what I meant. No different than a NM cable and a CAT6 cable going through a bored hole in a wood stud.
Do you run into conductor derating doing that?
- Location
- New Jersey
- Occupation
- Journeyman Electrician (retired)
No. Derating is not required when cables pass through a hole in a stud unless it's filled with fire stop or draft stop material.
Oh yes that’s right. Which is only required where passing though fire wall? And still have conduit fill at 60% yeah?
Yeah that sounds like a good idea honestly
In Europe that is not allowed. Also installations seems not too good. Segregation noise levels are MANDATORY
We’re probably not too far behind you