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The Ghost
Well when I did the 2395 I was armed to the teeth with the maths doing product over sum calculation for the RT above. However on the day I was zeugswanged and was asked to describe all the terminals on earth rod test, which I had not looked at too hard. And then you get a scenario of something like a factory and circuits described and a set of questions of various sorts on that. Things like what tests cannot be performed as the client does not want the sockets dis-connected, and it is not the first thing you would think of. The thing is all in the terminology. And strangely I had very little technical maths. Just simple things like resistors in parralell and series but only a couple not like the several above. I recommend Andrew Butlers - Basic Electrical Formulae for the maths. It's a little gem for revision. Bear in mind the Cmin factor has since been introduced with his worked examples.
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