The_Trician
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Some PIRs need a permanent live to work the timer.
I would imagine that you should have L, L/SW & N.
Depending upon the Class of PIR, you should also include a cpc, even if you just park it in a connector. That way, the 'line conductor must always be accompanied by a cpc' rule is also observed.
Personally, I'd treat the PIRs as 2 way switches and connect them together that way.
My guess is that the terminal marked 'A' stands for 'Activate' and is thus the switched live output to the lamp.
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