Linear Heat Detection Cables in raceways

[Electrobe]

Hello,

I am trying to determine if fire safety linear Heat detection cable can be installed in raceways and MCC gutters with 480V wires and cables. The fire safety company is saying it can but I cannot find a code section that permits it. Normally the cable would need to be rated for at least 600V but maybe there is an exception somewhere? From the cable specifications it looks like this cable is only rated for 42V but maybe there is a higher voltage rated cable available but I could not find any.

Can someone point me in the correct direction?

Thanks in advance!

 

[GoldDigger]

I would worry about the safey of the system input(s) that the cable is connected to. Unless they have opto-isolators or other input buffers which can withstand 480V (both capacitive and fault related) I would not be comfortable with it in those gutters.
It might work within specifications (although with a potential response delay?) if you enclose the detection cable within a sheath or small raceway.

The only Code allowance for it, as Class 1 or 2 low power wiring mixed with power wiring, that I can see would be engineering supervision, and that would be a stretch, IMHO.

 

[gadfly56]

LHD cable is not laid in with or directly on top of the cable tray contents. It is installed above, supported by clips. From that perspective, it isn't installed "in" the raceway.

 

[Electrobe]

LHD cable is not laid in with or directly on top of the cable tray contents. It is installed above, supported by clips. From that perspective, it isn't installed "in" the raceway.

Yes agree with above but we are planning to install this cable in the motor control center in the cable gutters along with 460V cables. Maybe a non-conductive fiber version of this cable could be used instead?

 

[gadfly56]

Yes agree with above but we are planning to install this cable in the motor control center in the cable gutters along with 460V cables. Maybe a non-conductive fiber version of this cable could be used instead?

I'm not aware of any fiber optic versions of LHD's, inasmuch as their operation depends on the jacket melting and causing the internal cable pair to short circuit. Again, you wouldn't install the cable in the gutter but suspended above it.