Forum: Electrical Calculations / Engineering

Hi all, does anyone think there is any added benefit to having an Air Terminals to ground LPS system installed if there is also going to be a TVSS...

The Code requires parallel conductors to be the same length. My question is how much of a difference in length is realistically acceptable? A...

I have to change a burned out a c motor that is 9 lead, dual voltage ( currently wired low voltage ) wye wound. I was sent a motor that is delta...

NEC 220.12(B) requires 150VA/foot of track lighting, "in other than dwelling units" to be added to the feeder and service load. Does this apply to...

Is it required to pull a ground wire to feed DC panels? Branch circuits? I was under the impression it wasn't necessary but I can't find anything...

Where would the Code address clearances between exterior light poles and underground gas lines for a pole having an accessible opening near ground...

I'm wiring a generator and I'm using PVC pipe in the ground outside for the normal, emergency and line power. I have four 4 inch PVC pipes for the...

when we wire a furnace in a basement, we install a thermal cut off switch. my first question is: do we really need it? is it code requered? my second...

i have a customer who wants a transfer switch installed on his house fror his gas generators(5500 watts and 7500 watts)question is he wants both of...

Is there any nationwide or industry standard for the color of branch circuits? Different regions seem to use different color standards. I know NEC...

I and another electrician are tasked with wiring an enclosed trailer to be used as a mobile kitchen. I don't see a section in the NEC that I can...

can be used solid cooper wire for wiring or has to be stranded wire

Is there any way of obtaining 240 volt 3 phase (4) wire from 208 volt 3 phase (4) wire without having to buy a special made transformer? I have to...

I've installed a 200 Amp service in an out building. The service runs down the side of the building to a meter base, through 23 feet of 2" rigid...

I am trying to find some information about terminating oil insulated 15kV cable. In particular the time needed to make a termination. I will be...

is anyone familiar with Tom Henry's Voltage Drop formulas? Specifically the one thatyou use to find wire size needed, given the load, distance,...

I have tried to explain to my customer why it is not a good ideal to have a 3 phase high leg panel with 120v and 3 phase circuits in it. They are...

We have a customer who is starting to build self contained environmental remendiation trailers for use in Florida. These trailers are similar to the...

I forgot the formula for calulating the take up on 3" & 4" grc. So I thought I needed to get this back together before I start my new job next week

first at all i am using one of the systems at follow NFPA 20 code in the code, the control panel should have two circuit breaker, one for...