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.
It used to be 0.67 x protective device rating giving minimum cable rating of 21.4 A but was "modified" to 20 A to coincidently satisfy the new Table 4D5 changes of CCC to suit newer building methods...............
Hmmmm. Last time there was a temporary relaxation in CCC was during WW2 due to copper shortages,
It used to be 0.67 x protective device rating giving minimum cable rating of 21.4 A but was "modified" to 20 A to coincidently satisfy the new Table 4D5 changes of CCC to suit newer building methods...............
Hmmmm. Last time there was a temporary relaxation in CCC was during WW2 due to copper shortages,
