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A 15 kW cooker, worked through34.57 amps on a 32 amp breaker?
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Same method, bigger appliance. 15,000 ÷ 230 = 65.22 A.
| Read correctly — Table A1 or A2 | Misread — 30% of the whole full load | |
|---|---|---|
| Load in excess of 10 A | 55.22 A | ignored |
| 30% of … | 55.22 × 0.3 = 16.57 | 65.22 × 0.3 = 19.57 |
| + 10 + 5 | 31.57 A | 34.57 A |
| Breaker | 32 A | 40 A — a size you did not need |
✋Both tables agree once they are read properly. Read correctly, 31.57 A sits under a 32 A device; misread, 34.57 A pushes you to 40 A for no reason.
Design high. A client who has a 5 kW cooker today will buy a 9 kW one in five years and will not mention it. Most installers fit a 32 A breaker on a domestic cooker circuit for exactly that reason, and the design allows for it.
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