Different Voltages in Underground "Christie" Box

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pgwelectric

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Can 220 volt and 24 volt conductors occupy the same underground junction box?
This junction box is 14" x 20" and is concrete. Low voltage landscape lighting and 110 volt and 220 volt circuits are planned to be pulled through this same box. Is this code compliant? NEC code? Thank you.
 

Dennis Alwon

Moderator
Staff member
Location
Chapel Hill, NC
Occupation
Retired Electrical Contractor
If the insulation on the low voltage cable is equal to the at least the maximum circuit voltage applied to any of the conductors in the enclosure-art. 303(C). I suspect the low voltage cable is rated 300v so it would be okay if art 725.136(A) doesn't affect you.
 

cadpoint

Senior Member
Location
Durham, NC
I had to go read the Code Article for myself.

If you are going to preceed with this installation make note of the low voltage wire,
that it has markings on the wire. If it's not marked (like some - are not) keep the
box, or get a cut sheet from the manufacture, and slip it into the job file at the office.
 
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