volt drop on low voltage circuits

[pwhite]

where can i find the limit on voltage loss for low voltage circuits. i looked in the nfpa 79 and 02 codebook under article 725, but didn't find it.
i may have overlooked it. i also read another post relating to volt drop, but they cited the canadian code.

i want to limit the loses to 2% and another engineer wants 5% as the max limit.

this is for plc inputs such as limit switches, photo cells. outputs will be beacons, buzzers, and valves.

thanks in advance.

 

[hbiss]

Re: volt drop on low voltage circuits

The Code doesn't cover this. Use whatever allows proper operation. I would think that your only concern would be the outputs since the inputs involve very little current.

-Hal

 

[bennie]

Re: volt drop on low voltage circuits

Hal is correct. Factor in the peak load and inrush current on solenoids, to determine size of the power supply and the conductors.

Low voltage devices have a low tolerance for voltage drop.