DC Conductors - box penetrations and fittings

[Windadct]

For AC - we can not run separate phase or Ph-N conductor s through separate ferrous openings and fittings. Does this rule apply to DC?

Granted - true DC would not have any eddy-current heating, but each occurrence does then encounter some inductance.

 

[Windadct]

such quiet?

 

[wwhitney]

The rule is NEC 300.20, and both subsections refer to "conductors carrying alternating current." So 300.20 places no requirements on DC conductors.

Cheers, Wayne