I working with another thread I was reviewing the "tap rules" and something came to mind that I had not previously considered.
When the tap rule limits the ampacity of the tap such as the "1/3" rule of 240.21(B)(2), which ampacity are you allowed to use ?
In other words, if I had a 50 amp 20 ft tap on a 200 amp feeder could i use #6 with a 90? ampacity of 75 amps, greater than 1/3 of the OCP, or would I have to use a #4 with it's 75? rating ?
When the tap rule limits the ampacity of the tap such as the "1/3" rule of 240.21(B)(2), which ampacity are you allowed to use ?
In other words, if I had a 50 amp 20 ft tap on a 200 amp feeder could i use #6 with a 90? ampacity of 75 amps, greater than 1/3 of the OCP, or would I have to use a #4 with it's 75? rating ?