Landscaping - running sprinkler timer wire in same conduit as electrical wire

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Lane S
06-30-09, 11:35 PM
I am running sprinkler timer wire in the same 1" conduit as some outdoor electrical wire for some outdoor plugs. Since the timer wire is low voltage, will the electrical wire for 110 v or 220 v interfere with the timer wire working properly if they are in the same conduit? Is it like Cat 5 with electrical wire interference?

Michael Thomas
07-01-09, 04:48 AM
Prohibited by NEC 725.136,:

(A) General. Cables and conductors of Class 2 and Class 3 circuits shall not be placed in any cable, cable tray, compartment, enclosure, manhole, outlet box, device box, raceway, or similar fitting with conductors of electric light, power, Class 1, non–power-limited fire alarm circuits, and medium-power network-powered broadband communications circuits unless permitted by 725.136(B) through (I)...
TheCaptain
07-01-09, 02:57 PM
It will not interfere with the sprinkler system working, but if anything bad happens to the wires, they could fuse together and send high voltage through low voltage wire. That is why as Michael Posted, you cannot run them in the same chunk of conduit.

If you go even an inch away, that is sufficient for the sprinklers. Just stick it in its own conduit for looks.