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Just looked at the TRADA tables Table 36 Permissible clear spans for joists for flat roofs with access for maintenance and repair only:- With a dead load (kN/m2) excluding self-weight of joist of not more than 0.50, A 170 x 47 C16 joist has a max clear span of 4.00 metres @ 400 c/c. A...

thanks

I think you misunderstand, the circuit is not switching the supply to the PIR, it's switching the output from the PIR

But PIR1 would have timed out by then (assuming both PIR's have the same time setting), the only time the lights would stay on is if PIR1 has been re-activated by someone walking past or until it timed out as set - which is what is wanted. With regards the lights flickering when PIR2 takes...

Why not apply a bit of Relay Logic and use just one relay - click diagram for full size image. If PIR1 turns on it controls the lights directly, If PIR2 turns on it disconnects PIR1 and controls the lights, eliminating any loopback problem. Just need a 2PDT relay. hth

Hi I'm building a dormer across the back of the house (first floor in extended roof space) and need some help with the edge details of EPDM single ply system. I was thinking of using 'Easyfit Roof Edge Trims' details here http://www.plytech.co.uk/installation.html but I'm not sure how to...