conduit inductive heating

[RRonke]

I am installing a 240V system which will operate 4 small exhaust fans each pulling around 1 amp. One 14 AWG phase of the 240V will travel 60 ft. in 1/2" EMT to a mechanical thermostat and will return in the same conduit. A insulated bonding wire will also be in the conduit. Since the phase conductor runs in both directions there shouldn't be any magnetic conduit heating right?

 

[Dennis Alwon]

Sounds like you have a switch loop. This is not a problem and is compliant

 

[kwired]

correct. Think of it this way, if you were to clamp an ammeter around all the conductors in the raceway, if you have a situation that would give a reading on the meter then you have a situation that would induce a magnetic field on any metal enclosing those same conductors.