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In the motor control industry, the oveloads are usually located in the netral side of the main starter coil! Is that a violation of NEC 404.2.B for switching the neutral? If you can show me that is legal, can I connect an indicator light (push-to-test) between the line (110 Vac)and the...

Per NEC table 310.15B2a, you need to use a derating factor of 80% for 4-6 current carrying conductors in the same conduit. In that case, how do you deal with the voltage drop? In other words, is there any differnce in voltage drop when you use one big conductor or two smaller equivalent...

Like to know if anyone may have some comparisons (pros & Cons)for using Magna Drive (magnetic coupling) and VFD. Comparisons such as cost, efficiency, maintenance, ease of operation, technical support, typical problems, etc. I am considering an varibale mean to drive three 250 Hp motor for...

Dear Folks, We have three 3-MW, 4160 V, 3 phase geneators. I would like to know the proper grounding and protection scheme for parallelling those generators. We are experiencing high circulating current (appr. 300A) when two generators are running in parallel and the load is very small (appr...