Number of 12/2 in 1.5" PVC

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Old 12-14-11, 01:32 PM
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Number of 12/2 in 1.5" PVC

I have three 220V baseboard heaters upstairs. Two 1500W, one 2000W, each powered individually by 12/2w/G Romex. Power comes from downstairs electrical panel. The 3 Romex are in a 1.5" Sch40 PVC which exits the back of the panel into the garage, up the garage wall approximately 10ft, where the Romex exits thru an elbow into the attic.

The PVC is there for protection. It's a 'busy' area of the garage. I prefer to use the word 'raceway' instead of 'conduit'. This PVC 'raceway' is already there. I'm not asking about why or what for.

Can I run another 12/2 thru this raceway?
Or, how many #12 conductors can be run thru this 1.5" PVC ?

Thanks, SteveS
 
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Old 12-14-11, 02:05 PM
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Short answer: yes, you may. But this is the last one you'll be able to run. After 9 current carrying conductors (you have 6 now, and will be adding 2 more), you'll need to upsize the conductors to compensate for derating.

Also, as far as I know, the NEC makes no distinction between raceway and conduit. Or at least, conduit is a type of raceway.
 
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Old 12-14-11, 05:50 PM
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It looks to me like the easiest thing to do would be to combine the two 1500 watt heaters onto one 12-2 circuit thus freeing up one 12-2 cable for your use without having to run a new one at all.
 
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Old 12-14-11, 07:13 PM
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You're not even allowed to put jacketed/sheathed in raceways .(Whatever the word is for multiple conductor cables).

So already you're breaking the code

But a 1 1/2" raceway can accommodate about 12 conductors of 12AWG (that's 6 circuits).

It's huge after all.
 
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Old 12-14-11, 07:40 PM
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Originally Posted by insthink View Post
You're not even allowed to put jacketed/sheathed in raceways .(Whatever the word is for multiple conductor cables).

So already you're breaking the code
This is a common misconception. This is allowed under the NEC and may be required if the cables are subject to physical damage.
 
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Old 12-14-11, 08:09 PM
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Not that he needs my concurrence but PC is absolutely correct that there is no code prohibition on using jacketed cables in raceway.
 
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Old 12-14-11, 08:31 PM
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Thanks for the feedback.

From Joes reply, however, arises another question.

The three baseboards are in separate rooms. I understood separate power supply is required for each appliance.
Or can the two 1500W heaters (in separate rooms) be powered from the same breaker?
 
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Old 12-15-11, 04:32 AM
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The voltage will make a difference. 3000/120 = 25 amps. 300w/240 = 12.5 amps. Heating circuits need to be sized for 125%.

25 * 1.25 = 31.25 amps.
 
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Old 12-15-11, 04:51 PM
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All three heaters are 240 volt.

The three baseboards are in separate rooms. I understood separate power supply is required for each appliance.
Or can the two 1500W heaters (in separate rooms) be powered from the same breaker?
A seperate power supply for each heater is not required. I would join the two cables that feed the two 1500 watt heaters in a junction box in the attic and feed them with one 12-2 feeder. That leaves one 12-2 feeder for the 2000 watt heater and one spare 12-2 feeder.
 
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