With reference to 433.1.204 and cable as installed has min capacity of 20A if protected by a 30A or 32A. If the protective device is reduced to 20A how is the new minimum as installed capacity calculated or arrived at ? I've been looking in the Electrical Installation Design Guide, but the answer is avoiding my eyes.
I suppose that the overloading could occur in say a commercial kitchen in a restaurant or pub.
The Regulation is not referring to the total load but for typical poor design where the CU is in the kitchen or utility room and the route of the cable calls in first to heavy loading and then wanders off round the house (or rest of room) before returning to CU.
Hopefully I don't have to explain current and path of least resistance.........
I suppose that the overloading could occur in say a commercial kitchen in a restaurant or pub.
The Regulation is not referring to the total load but for typical poor design where the CU is in the kitchen or utility room and the route of the cable calls in first to heavy loading and then wanders off round the house (or rest of room) before returning to CU.
Hopefully I don't have to explain current and path of least resistance.........
