can we install power 480 VAC and control 120 VAC cables,,, each one in different conduit but in parallel and adjacent ?also for two control cables ,,,, can they installed in one conduit ?
Yes. That shouldn't be a problem. if it were data or extra low voltage dc then there could be some mutual induction issues. generally speaking. low and extra low voltage can be installed in the same conduit as long as the extra low voltage cables are insulated to the higher voltage present. ie use all cables rated at the highest voltage.
it isn't the final thank you to do it. there may well be some capacitive or inductive coupling between the 480 and one hundred twenty circuits that would adversely influence the controls. An unintentional short between the 480 and one hundred twenty circuits may well be a disaster on your controls.
Yes, on both questions. To be extra safe, use steel conduit. It kills the EMF better
It is a standard practice...to run power and control cables in different conduit but the basic criteria is voltage gradings.All cables upto 500volts can be laid in one conduit whether power or conrol.In case of high voltage cables, because of elecromagnetic inducion effect, different conduit is adopted.
