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I had looked through OSHA to see if there were rules on the amount of distance from a load center to the equipment (such as a portable tool) it is supplying. In essence, the temporary power I need is power for equipment like concrete vibrators and the like. The width of my building is about 170...

I see your point. I figured I could start with a "gross" model of the 3 impedances and then add complexity from there. The other part of my question is what of further concern- that is, when I switch the power system off and attempt to run on standby power, is there any form of residual...

I have a situation where an engineer has placed a 3 phase automatic tuned capacitor bank rated for 150kVAR. It is intended for power factor correction. The service itself is 480V, 3 phase, 3 wire, 1600A. The 1600A switchboard feeds (3) 480V MCCs, (2) of which have VFDs on them. Here are my...

I have an application using a 10kVA UPS in 208/120V in an electrical room. The batteries specified are VRLA batteries. The UPS is being placed in an electrical room along with (3) MCC's, VFDs, and panel boards and transformers. The equipment is all low voltage (480V) and below and there is a air...

I forgot to mention that this is a NEW installation.

In this case, to clarify: 1) The cable used is unshielded cable 2) The cable is routed in conduit 3) The cable is partially run underground and that it transitions to above ground. The values given were measured in phase to phase. I thank you in advance for your responses.

Have you considered chemical treatment of the soil as part of your installation. Companies like Lightning Eliminators and Consultants have chemical ground rods that change soil resistance which will help give you a low impedance path. Please note that one of the most important principles of...

I have been testing 480V cable and I obtained some of the following results: - 22 giga-ohms I wanted to know if this seems like a "realistic" value to obtain. Note that these values were obtained at about 80 degrees F and a distance of 150 feet and #2 AWG conductors. As an example, I believe...

Hello, I am looking to confirm what is a good insulation value (in mega-ohms) for 480V power cable.In my situation, I have remote sites that each have its own 480V power distribution system and our specifications require megger testing of the cable. Here are my questions: 1) Since this is...