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Old 01-05-08, 11:36 PM
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code question

Does anyone know how many 12 wire conductors are permitted in a 3/4" ENT flex (smurf) conduit?
 
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Old 01-06-08, 08:17 AM
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It depends on the type of wire. THHN is 13.

You may be limited by de-rating the conductor ampacity before you reach this limit.

For example. One of your wires will need to be a ground. So you could have 12 Current Carrying Conductors. The starting point for calculations on no 12 thhn is 30 amps. With 10 conductors you are in the 50 percent de-rating columb. So your number 12 wires would have to be on a 15 amp breaker.

You have a bigger problem if you are using no 14 wire. The starting point for calculation is 25 amps. At 50 percent you are down to 12.5 amps capacity. It is harder to find a 10 amp breaker.
 
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Old 01-06-08, 09:53 AM
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How many conductors would I have to drop down to for a 20 amp circut?
 
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Old 01-06-08, 10:26 AM
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9 or less current carrying conductors in the conduit.

That means you can have 10 including the green ground wire.
 
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Old 01-06-08, 10:46 AM
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Thank you very much.....Time to get working
 
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