The PIR will normally have 3 or 4 connections depending on if it is
itself earthed (if its not, you must still provide earth continuity
through to the lamp fitting)
Typically there will be a live and neutral in, and then a switched live
out. You need to connect the lamp between neutral and switched live. The
choice of cable will depend a bit on where the various bits of the setup
Here is a typical wiring layout for one or more PIRs switching one or
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