I need some help sizing 4160 volt parallel cables. I have a 6000 HP, 734 FLA motor load fed with 105 degree C cable. I want to feed it in an underground duct bank. Article 430.22 says that my conductor has to supply 1.25 times the FLA or 917.5 amps. Divided by two results in about 459 amps...
I have a question on what qualifies as a service disconnect. I have a 25kv service feeding a 15000 KVA transformer. The utility company is providing the primary underground, but the transformer (customer owned) has top bushings and I have to transition up a pole and feed it from overhead. The...
I have a 3 wire vs. a 4 wire question for you folks out there. My primary transformer has a 12470 volt, 3 phase delta primary - 4160Y2402 secondary. However, my loads on the secondary of the transformer are all 3 phase, 3 wire loads (large motors). Can I ground the XO terminal on the...
