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This is kind of a proffesional question but I need some advice and I dont know where to ask. I was wondering if anyone had any recommendations for the best calculator to use for the PE exam. The options are: Hewlett Packard – HP 33S Casio – FX 115MS or FX 115MSPlus Texas Instruments – TI 30X...

I took a course on it in college. The book I used was Protective Relaying Principles and Applications by Blackburn. It can get really technical but a good book to have or to at least look at.

Thanks for the response. The sewer line under the transformer will be concrete pipe....everyelse it will be pvc. There is nothing in NEC. I am just not sure if there is local jurisdiction. I am having trouble finding anything online and unfortunetly right now the engineer at the utility company...

I am doing a design in arkansas. Do to limited room we are looking at putting a transformer over a non pressurized storm sewer pipe. Is there and clearance requirments for that with respect to the pipe and electrical equipment including conductors in conduit. Unfortunetly this is not my design...

Thanks

I took a basic power course back in college and I work for a A/E consulting firm so we dont deal with it alot, but could someone simply tell me what each of the above mean and how this is involved in a 3 phase system.

With a residential 240/120v tranformer, assuming the load is balanced on the 2 phases, is there still neutral current because it is not a 3 phase system. Does anyone know where I can get calculations to support this? Thanks.