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Puny Bird
Join Date: Nov 2002
Location: Port Hope (near Toronto) On, Canada
Posts: 4,566
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Electrical question, can I double up 12awg t90 to make 10awg?
I'd like this to be answered by a real electrician 
My idiot ex-buddy (who is suppose to be an electrician, ex-buddy mostly because he became a miserable drunk) wired up my 5hp compressor 230v with 12 gauge 20amp breaker. It ran fine for years but has started to trip the breaker.
The motor is 5hp, 1740rpm, single phase, 208/230v and 24.5 amp. Fresh rebuilt, new bearings, run cap and switch. My research says it should be 30amp using 10awg wire. It's about a 50' total run
The exact same motor is in the vid below, showing the spec plate at 1:54
https://youtu.be/4RRB7tvm-eU
Now, I have all kinds of 12awg T-90 wire and conduit running almost all the way to the compressor and then I have a long enough piece of 10awg BX to get me the rest of the way. I know how to twist a proper joint.
Is it OK/legal to double up the 12awg T-90 to make 10awg?
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'74 Porsche 914, 3.0/6
'72 Porsche 914, 1.7, wife's summer DD
'67 Bug, 2600cc T4,'67 Bus, 2.0 T1
Not putting miles on your car is like not having sex with your girlfriend, so she'll be more desirable to her next boyfriend.
Last edited by Mark Henry; 10-04-2015 at 07:43 PM..
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