How many #14 wires can you run in 1/2 inch thinwall conduit. I seem to remember seven but want to make sure. There are five currently and I have to pull one more to interconnect my fire alarms.
Wayne
How many #14 wires can you run in 1/2 inch thinwall conduit. I seem to remember seven but want to make sure. There are five currently and I have to pull one more to interconnect my fire alarms.
Wayne
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Replies
THHN ?
12 wires max....
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., wer ist jetzt der Idiot ?
Edited 7/9/2007 12:24 am by maddog3
Thanks maddog3 it's good to know I had a lot of room to spare.
Wayne
you're welcome but even though you have room don't forget the wire in that pipe has to be de-rated ..to only 80% now.....
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., wer ist jetzt der Idiot ?
The rules in the soon-to-be defunct NEC are, by definition, needless Byzantine. Ultimately, the end result is 9 current carrying wires.
There are two seperate operations: wire fill and de-rating.
For wire fill, you total up the area of all the wires and check if this is less than 40% of the internal cross section of your pipe. Check Chapter 9.
For de-rating, you start with the 90* column but use the 60* column. The 60* column says your #14 wires are good for 15 amperes and you use a 15 amp breaker. For 9 wires you derate 70% from the 90* column and you end up with something a little over 15 amps. But the dagger says you must use a 15 amp breaker.
10 wires and over, you derate 50% and end up with something less so you would have to use a 10 amp breaker which is hard to find.
Then sometimes, you can go to the next larger common breaker [up to 800 amps] but, in this case, the dagger rules.
~Peter
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