Power cable is usually 2.5mm which allow 30A in a ring and 20A radially. Now people rely on central heating, power cable rarely gets used to capacity.
The IEE regs are specific on it and you can read them in the library. However in practice the main problem is confusing future electricians. If you adopt non-standard wiring it could lead to confusion and extra labour charges when correcting faults or extending wiring.
don't think the problem is confusing future electricians - most of the good ones will not trust what they have until they've checked it - confusing future diyers is the most dangerous thing, because they don't know what to look for and don't have the knowledge to check properly
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