zanydroid
Solar Wizard
What about
300.20 Induced Currents in Ferrous Metal Enclosures or Ferrous Metal Raceways
(Though it doesn’t explicitly say the current needs to be balanced). If you run the conductors in ferrous conduit, then it needs to be either L-L-N , or if L-L the conductors need to come back on the same return path. In this latter case there are 4 current carrying conductors so derating would be needed.
If you run the conductors in non-ferrous conduit you are fine from conduit angle, but when the imbalanced current enters a ferrous box considerations need to be made. For instance if you have a ferrous pull point or splice point. Or if you originate and return to the same ferrous box. In the latter case you would need to either make them come back in the same hole (maybe by using a non ferrous JB or conduit body to regroup them) or make appropriate cuts in the ferrous box between the holes to block the eddy currents
For 300.3, switched legs are allowed to exclude neutral (those have balanced current) but are required to have lines in same path even if non ferrous.
300.20 Induced Currents in Ferrous Metal Enclosures or Ferrous Metal Raceways
(Though it doesn’t explicitly say the current needs to be balanced). If you run the conductors in ferrous conduit, then it needs to be either L-L-N , or if L-L the conductors need to come back on the same return path. In this latter case there are 4 current carrying conductors so derating would be needed.
If you run the conductors in non-ferrous conduit you are fine from conduit angle, but when the imbalanced current enters a ferrous box considerations need to be made. For instance if you have a ferrous pull point or splice point. Or if you originate and return to the same ferrous box. In the latter case you would need to either make them come back in the same hole (maybe by using a non ferrous JB or conduit body to regroup them) or make appropriate cuts in the ferrous box between the holes to block the eddy currents
For 300.3, switched legs are allowed to exclude neutral (those have balanced current) but are required to have lines in same path even if non ferrous.