Bundling Low Voltage wires with 9VDC wires

Everything you have listed is low voltage and can be in close proximity. I would NOT bundle any other wires for any purpose with the fire alarm wiring. Actual fire alarm wire is red and very stiff and by code must only be paired up with identical wires of the same purpose.


Fire alarm wiring is not to be spliced either anywhere except in a metal Jbox clearly marked as fire alarm or fire detection. No other cables for any other purpose must be in the Jbox.

For NEC code considerations, I believe the cut-off for low-voltage is 48 or 50 volts (I honestly forget which). 48V and below you are OK to have bundled together. Anything above that needs to be separate from line voltage (~120V).


Best,


Carl

Thanks guys for the clarification. Am good to go now.



Quote:
could some tell me if 9VDC wire supplying current to a dome camera is considered HV?

Click to expand...

9V is not high voltage. It's also DC which can't induce any interference.

Why is it that telephone wires are all considered LV, if the ringing produces 90V AC current?

The ring voltage is 90VAC but at20 hz, it is not a continuous voltage and as soon as there is a load on the line from going off hook, that voltage drops to 5VDC and is highly current limited.

But while the phone is ringing, there is 90V AC, at 20 Hz, sinusoidal, passing through the 'LV' cable.


current = ~5 REN, enough to ring 5 phones, 40-45 mA - I guess there is some NEC spec about current as well as voltage.


Edit - found this interesting, undated description of 'Low Voltage Circuits'

http://www.electrician2.com/weltrain05/lpage103.html



Quote:
Originally Posted by Neurorad /forum/post/19472067


But while the phone is ringing, there is 90V AC, at 20 Hz, sinusoidal, passing through the 'LV' cable.


current = ~5 REN, enough to ring 5 phones, 40-45 mA - I guess there is some NEC spec about current as well as voltage.


Edit - found this interesting, undated description of 'Low Voltage Circuits'

http://www.electrician2.com/weltrain05/lpage103.html

Click to expand...

Kudos. Great little article.


Carl

9 volts is low voltage