Two Different Power Sources In One J-Box?

[Loffgren]

Can someone reference me to the code book section relating, to two circuits from two different sources in one junction box...Thanks

 

[Rewire]

210.5 (c) comes to mind

 

[Loffgren]

re

re

good one thanks

 

[augie47]

220.6(D) might be applicable, and 300.(3) (c)