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I am on a 3 fase circuit at a kent hospital where they want 2 unipact drylon machines installed as a hybrid for the smaller ones should i use the 400 or 240?

Cheers M107, that's great. As for the rest of you a little humility goes a long way. If this was a school what you do would be called bullying.

I thought red was live and black neutral. Am I wrong? If I need a third where would I draw it from?

I have an Elro ES360M motion sensor switch. It has 3 Cable connections. LS (Switched Live), L (Phase) and N (Neutral). My existing light switch has just the 2 cables red and black. How can I wire this device?