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Thanks for your replies. If I have done my sums right, I get Rf's formula to CSA = K2/K1 x actual SWA section 51/115 x 70 = 31.043 If this is right, the answer is less than the 35mm that ricicle suggests. The cable used is BS6343, so Spark123's table...

Does BS 7671 require a 70mm 4 core SWA have to have a separate earth conductor, or is it legal to just use the armouring within the cable?