control circuit

[hhsting]

I have 480V to 24 vac transformer. The 24 vac conductors go to emergency push button. The conductors are sized #12 awg. What determines the size of the 24 vac control circuit? Also does the 24vac control circuit need overcurrent protection?

 

[petersonra]

I have 480V to 24 vac transformer. The 24 vac conductors go to emergency push button. The conductors are sized #12 awg. What determines the size of the 24 vac control circuit? Also does the 24vac control circuit need overcurrent protection?

The ocpd is sized the same as for 120v or 480 v.
All circuits need protection of some sort.

 

[BillyMac59]

The kVA rating of the xfmr will help you determine available ampacity on the secondary side. You can choke it down from there to use smaller sized conductors for your control wiring.

 

[don_resqcapt19]

That is a two-wire to two-wire transformer and you can use the primary protection to protect the secondary winding and secondary conductors.
What size is the transformer and what is the connected load?

 

[augie47]

Sounds to me like a Art 725 circuit which would be covered by 725.43 along with Art 450.