Dual Supplies

[La Poste]

Greetings all.

I have taken ages erecting a rather nice looking conduit system for my neighbours very large garage/barn.
I am due to pull the wires through this weekend, all switches, sockets, lights etc are in place.

The thing is I want to put the outside lights and the inside lights on separate MCB's/ RCD's.
I have two gang switches on the outside and the inside of each door.
These two gang switches will control the inside and outside lights respectively.

The problem is that with this arrangement I will have one supply to the outside lights and one supply to the inside lights within the same switch.
Is this acceptable?
I cannot see why not, I understand it may add an element of danger in the that if the client isolates the inside lights and then opens the switch he may think the whole switch is dead when in fact half of it is still live.

The other query I have is I am fitting a PIR for the inside light on one of the drive in garages.
This drive in garage has no door and my neighbour will simply drive his car in and the light will switch on automatically.
I have bought a manual overide PIR but don't feel this is enough as the PIR will only switch on at dusk.
If my neighbour wants light in this area in the daytime to for instance check the oil in his car then he will have no light until dusk.

I was thinking of wiring up a light with two supplies.
One supply from an on/off switch on the wall and the other supply to the light would be from the PIR which as I say will only activate at dusk.
So would having two supplies to one light be acceptable?
I wonder if this would damage the PIR, the fact that the switched live cable of the PIR would be connected to a live feed from a light switch, there would be a live feed from a light switch and a live feed from a PIR in the same terminal supplying the light.

The other issue is I am thinking of using this job as my assessment and I wonder what the assessor will think of all this.

Your thoughts would be greatly appreciated.

Many thanks.

 

[morph]

more than one point of isolation sticker slapped on the light and the switch, but its a bit lazy of you really when you could just stick to conventional supply

 

[alarm man]

one question would be..why 2 feeds

 

[La Poste]

one question would be..why 2 feeds

For the PIR do you mean or the outside/inside lights?

 

[alarm man]

For the PIR do you mean or the outside/inside lights?

why not just one feed for both and use pir sensor for the drive in part like those you find in an office set up,no dusk setting just movement..

 

[La Poste]

why not just one feed for both and use pir sensor for the drive in part like those you find in an office set up,no dusk setting just movement..

That is indeed the best idea, there's nothing like common sense, thanks alarm man.
And then just wire up the PIR with the manual overide that is supplied with the unit.

That just leaves the inside and outside lights feeds.
There are five inside lights and four outside lights.
I was thinking it may be best to have them on separate RCD's because if the outside lights go then there will be lights inside but one switch will have two separate feeds.
So a two gang switch with one feed for one switch controlling the inside lights and one feed for the other switch controlling the outside lights all within the same enclosure.
It's a big garage with three individual separate units.