Multiple PIRs with Multiple Switches on Electrical Circuit

Question

I have a pathway through the garden to get to my gate which i want ot illuminate with 3 floodlights. Its not certain that PIR sensors alone will work so I want to be able to override them by switching on the lights EITHER at the gate OR at the front door, but otherwise have the PIR sensors work as usual. I have watched every youtube video and tutorial and I think this is correct however I'm not sure about whether there is a dangerous loopback in this circuit. Can I loopback the earth like this and can I wire multiple PIRs and switches together all in parallel like this (European colouring below)

EDIT: added the specsheet install details from sensors below

Answer 1

Yeah, that looks fine. You have to watch your cable routing to make sure you don't have imbalance current in any cable. I.e. currents must be equal/opposite in any given cable and a clamp ammeter around any cable must read 0 due to mutual cancel-out.

If I was making a wiring diagram it would look like this. Omitted for clarity: protective earth/ground.

Answer 2

I am assuming the PIR sensors are line voltage and not low voltage. The problem with your proposed wiring circuit is that the hot and neutral for a circuit must travel in the same cable. However your power coming from the switches is returning on a neutral on a different cable which is against code.

The only way I can think of to fix this is to add a relay switch which would isolate the two circuits and ensure balanced power in all cables. Also the grounds should also be in the same cables so I updated your diagram to add the relay switch and the proper placement of neutrals and grounds

Answer 3

In the USA you can't run a separate parallel path for live but not neutral. Presumably in other countries too.

More importantly you've designed a terrible user interface. With three way switches and two parallel PIRs a user cannot know whether and why the switches are on or off.

I suggest you do this differently. If you describe your actual needs in a new question, from the perspective of a user who did not design and install it, we can suggest appropriate switches to achieve it.