100-250VAC & 24VDC in one multi-conductor cable

[bafco]

Hello all,
Keeping AC and DC separated has always been a rule I've followed. I've got a space-limited application now though that would easily be cured by having a multi-conductor cable between two cabinets, using three conductors for my AC and the remaining two or three for my DC. The distance is short; 10' or less. I know functionally it will work, but I'm curious about agency approvals i.e. UL, CSA, CE, etc.

Any insight?

~Mark

 

[dpc]

If you are in the US, there are no Code issues, as long as all conductors are insulated for the maximum voltage involved. That should not be an issue at 240 V ac.



David Castor

http://www.cvoes.com

 

[resqcapt19]

There may very well be code issues if the installation is under the rules found in the NEC. If the 24vdc is an Article 725 Class II or III circuit, the conductors can't be in the same cable or raceway no matter what the voltage rating of the conductors. In general 300.3(C)(1) says you can mix system conductors as long as all of the conductors have insulation for the highest voltage of the mixed systems, but the Fine Print Note tells you to look at 725.136(A). The rules in Article 725 modify those in Article 300. Code sections are from the 2008 code, the rules have been in the code for many code cycles, but the sections have changed over the years.

 

[dpc]

Yes, I agree with resqcapt19. I wasn't thinking about the Class II and Class III circuits when I wrote my response. Sorry for any confusion.



David Castor

http://www.cvoes.com

 

[bafco]

Thanks for the info guys,

~Mark