Intrusion Detection Switch on Transfer Switch

[AFriend2]

At a project I am working on we will be installing a 480V, 150A manual transfer switch and a generator tap box at a pump site. These NEMA 4X boxes will be pedestal mounted inside a fenced enclosure. Intrusion detection is required on the boxes. The magnetic contact switches I'm considering use 24V for SCADA pickup. Will these 24V contacts violate the NEC for mixed voltages?

 

[iwire]

You should be able to comply, check out 725.136 Separation from Electric Light, Power, class 1, Non?Power-Limited Fire Alarm Circuit Conductors, and Medium-Power Network-Powered Broadband Communications Cables.

 

[AFriend2]

RE: Intrusion Detection Switch on Transfer Switch

iwire - thank you.

I believe paragraph "(D) Associated Systems Within Enclosures" allows the contact siwtch to be mounted on the switch box providing there lead wire are in a non-conductive sleeve or barrier and located 6mm (0.25 in) from any other conductor.