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That is disputable. By the same token, hang-gliding is statistically much safer than power flying. (Power A/C prangs happen on a runway under the nose of an ATC... go figure.) While fires -however small- are always reported, I would suspect that the majority of doorcloser-related injuries go...

As in all these things I'd suggest following standard trade practice. Tradesmen do it that way for a reason. Reason: It works. Avoid the products of 'Bright-eyed and bushy-tailed inventors" and stick to standard practice.

PIRs normally use a closed pair to signal activation, so this can be connected in series with a magnetic contact. This is standard installer practice, where for example a PIR is fitted over a door with a contact. You need six cores (three pairs) to the PIR (power, signal, tamper) and four...