That is interesting. That quoted reg is about the disconnecting of the neutral conductor and not about main switch.

The main switch bit in the book just states that it must isolate a supply.

If the symbol of the single pole CB states that it is suitable for isolation then I think a single pole is ok.

Interesting point and keen to get some clarity too.

I always have a double pole mains witch in my boards as I like to disconnect the neutral for testing of things and then I know it isolated proper.



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