120V 400hz & 120V 60hz in the same raceway

I'm wondering what are the regulations and disadvantages besides noise?
Can somebody help me out?

[This message has been edited by Eclavea (edited 12-09-2000).]

[This message has been edited by Eclavea (edited 12-09-2000).]

NEC Article 300.3(c)(1) seems to permit such an installation. (Frank) cinkerf

it is perfectly legal to run different voltages in the same conduit according to the NEC. Keep in mind that the NEC sets the minium standards.I will run 120 240 volts in same conduit but WILL NOT run 120 /240 with 277/440 you may know you did it but a lot of the unsuspecting do not know it and can be hurt or burn up equipment so if at all possible keep them apart

Make sure that you label the Neutrals somehow so that they will not be confused. [Linked Image]

Thanks for your input guys.