What Do You Think of This Circuit?

[securespark]

 

[bernardgreen]

If the PIR has a relay switching the Live to the lamps then it looks to be OK.

If the PIR uses a solid state switch then connecting a Live directly to the Switched Live of the PIR's solid state switch may have an adverse effect.

 

[securespark]

Thanks, Bernard. Can you elaborate, please?

 

[SUNRAY]

If the PIR has a relay switching the Live to the lamps then it looks to be OK.

If the PIR uses a solid state switch then connecting a Live directly to the Switched Live of the PIR's solid state switch may have an adverse effect.

Been there replaced, PIR with one that can take it.

Also and this is a bit crafty... if the LED can run on 1/2 wave rectified DC fit a couple of diodes.

 

[EFLImpudence]

Would they make a PIR which could be damaged in such a way when wiring similar to that is common-place?

 

[securespark]

Just been looking at manufacturer specs and whether they are relay or SSS is not listed. Rang BG and they didn't know....

Does anyone know of a suitable relay-operated PIR min 180° (got to be able to switch 35W of LED load)?

 

[bernardgreen]

Thanks, Bernard. Can you elaborate, please?

Briefly putting Live on the Switched Live when the SS device is OFF ( non conducting ) can "reverse bias" the semiconductor junctions in the SS device, they should resist this but not all do.

Steinel 180 is a good PIR

 

[SUNRAY]

Thanks, Bernard. Can you elaborate, please?

Usually the instructions will give the permissable connexions and if they don't show any form of bypass switch I'd suggest not trying it.

 

[aptsys]

Looks fine to me. There's no issue with the bypass switch so crack on.

 

[AndyPRK]

Basically he means it will blow up and not work again

 

[aptsys]

No conceivable reason why it would blow up. All configurations for making an SSR are safe to bypass.

 

[ericmark]

Been there replaced, PIR with one that can take it.

Also and this is a bit crafty... if the LED can run on 1/2 wave rectified DC fit a couple of diodes.

That may stop the RCD from working, have you tried it? and did the RCD still work? and what type of RCD was fitted? I have read conflicting reports on type AC RCD's and DC current. The test rig I saw used had pure DC, and clearly that is different to half wave rectified DC, they also used a three phase RCD and fed the DC through the unused phase connection, so not sure if they really stop working or if the test rig was designed to worry those who watched the video.

I have wired a farm house with DC lighting as it was on a generator, and did use a diode matrix so any bedroom light worked hall light so one knew if bedroom light left on, but no real need in the UK.

As yes have found PIR units which did not work correctly if live fed to both sides, it did not harm them, just stopped them working, the main thing is where there is no neutral to switch and it needs a slight volt drop across the unit to power it. Same applies to all electronic light switches.

 

[aptsys]

As yes have found PIR units which did not work correctly if live fed to both sides, it did not harm them, just stopped them working, the main thing is where there is no neutral to switch and it needs a slight volt drop across the unit to power it. Same applies to all electronic light switches.

That shouldn't matter as you don't need it to work if you have the override on. As soon as you release the override the switch will work normally as it would do after a power outage.

 

[ericmark]

To set the PIR one switches it off/on so many times, this needs doing after a power outage, once in a blue moon with power outage not a problem, every time other switch is used, rather a pain.

 

[flameport]

Does anyone know of a suitable relay-operated PIR min 180° (got to be able to switch 35W of LED load)?

This Eterna one: https://cpc.farnell.com/eterna/pir180bk/pir-stand-alone-180-deg-blk/dp/SR07007
Also available in white, and from other suppliers.