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Hi I am currently training to be an electrician and whilst wiring a factory the other day I was wondering what denotes the Size of bonding cables. we are working on a 3 phase system with a 300 A head. I was told to do the water, gas and structual bonding in 50mm, which I questioned saying it seemed a bit excessive. My boss told me you could get away with 35 mm but to do it in 50 any way. When I asked how you can find out what size to use he just said it was all to do with the incoming neutral and a certain ratio between the 2. I try to talk to my boss as little as possible so I didnt ask for an explanation. cheers
 
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