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Apart from the following sentence, which discusses cords longer than 10 metres, it doesn't say anything more about minimum cord CSA for ring final circuits. Page 136, talking about radial circuits, says:Generally, 0.5 mm² cords should be the smallest size connected to plugs fed by 30 A or 32 A ring circuits.
Obvious question, why is is acceptable to plug a 0.5 mm² cord into a 32 A ring final circuit but not into a 20 A radial circuit?The minimum cross-sectional area for flexible cords should be:
0.5 mm² where the radial circuit is protected by a 16 A fuse or circuit breaker,
0.75 mm² for a 20 A fuse or circuit breaker,
or 1.0 mm² for a 30 A or 32 A fuse or circuit breaker.