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I'm trying to run a feasability study into replacing a boiler and would like to calculate a new supply cable size. I've tried several online calculators and have varied results. The supply will be fused at 200A to supply a 115kw boiler on a 3 phase supply at 400v over a run of 27m. The isolator...

Thanks for the trench/lid suggestion. this seems like the best solution providing it doesn't contravene any regulations. Would there still need to be a minimum depth, or is it more about plate thickness of cover?

Hi there, I work as caretaker for a small college and am seeking advice about a supply cable to a new electric boiler. We need to run a 200A supply through the building which could go one of two ways. Between the ground floor ceiling and 1st floor would mean a lot of hassle and 10 extra metres...

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