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Hello All, Does anyone know where I can find information on this topic. Particularly helpful would be a study that provides ground fault current vs structural concrete strength and/or life expectancy.

Hello All, I created a ground grid for a multi-peaker unit site with soil resistivity in the neibhborhood of 10.7 ohm*m. There is approximately 7000 meters of 4/0 copper with some 500 kcmil in the heavy fault (60kA) area. The grid area is in the neighborhood of 300km^2. My calculated GPR is...

Can DC conductors be used in the same cable with AC conductors?

Hello All, Does anybody know where I can find standard Rt and Kt values for sizing an industrial Lead-Calcium battery? I've made the entire iterative spreadsheet recommended by IEEE-485, but it does me no good without those values. Also, does anyone know the design factor used for sizing the...

I have a question concerning the motor system for a crane bridge drive. I'm writing a spec. for a 15 ton upgraded to 25 ton (by mechanical means with reconditioned motors) overhead electric crane. Presently the bridge has a duplex drive (for 2 DC mill type 800 series motors), series wound...