So an old colleague of mine stipulates that ring main should be protected by 20 amp breakers. Why you ask?
Well he said because a piece of 2.5mm2 can only take circa 26 amps and if the ring main broke at any point it would effectively make it two radials, and it would be protected by a 32 amp breaker if done the traditional way.
I can sort of understand his reasoning but if it was such a problem surely it would be common for everyone to wire ring main with 20 amp breakers.
Any thoughts?
Well he said because a piece of 2.5mm2 can only take circa 26 amps and if the ring main broke at any point it would effectively make it two radials, and it would be protected by a 32 amp breaker if done the traditional way.
I can sort of understand his reasoning but if it was such a problem surely it would be common for everyone to wire ring main with 20 amp breakers.
Any thoughts?