Recently I hired an electrician to install a new 60 Amp service into a workshop about 30 ft away from my house. He used 6-3 AGW UF from the house panel all the way out through the foundation to the new sub panel. My question is the following. When he went through the wall from the basement of...

Hi all: I just received two Yaskawa P1000 configured VFDs, with input rating of 460V, 207A, 3ph. The drives came with 400A disconnects and 500A fuses installed. My question is this, if the NEC requires conductors to be sized not less than 125% of rated input current, why does this have...

Hello all, 10 year grunt electrician in commercial and industrial, little residential experiance. Bought a new home in Minneapolis and need to upgrade. I'd like to to bring a 200 amp service to detached garage and then feed the house underground. Will i be able to put a 200a panel in house...

Help please, here's a question on: NEC, Annex D, example D2(a) (Optional calculation for one-family dwelling, Heating Larger than Air Conditioning). My question concerns determination of the 'Feeder Neutral Load' for that example D2(a) in Annex D. And my question is... why is the 9000 watts...

In NEC Article 220, Part III (Feeder and Service Load Calculations) what provision is there for an air conditioner load ? W-H-E-R-E in Part III does air conditioner load fit into the scheme of things? Ranges, clothes dryers, etc, are addressed. But what about an air conditioner load ...

Hi, I have situation, where service panel (2x200amp) got moved to the side of the house, where already had 2 x SER AL 4/0 4/0 4/0 2/0 wire at meter main going so 2 subpanels, now I have 2 x 2'' conduit from service entrance to the house (about 40'). Planing put 18x18 jbox to splice SER and feed...

Please help me with this question? I have a four (4) three phase motors 15 Amperes each one, they must be protected each one by a circuit breaker, also i have a three phase transformer 150kVA also protected by a circuit breaker. These circuit breakers are connected to a 480V - 3PH bar inside a...