PIR lights with independent override - Any issues with my circuit?

[RockySundae]

Hi all, I'd like to implement the below design but would like to check that it is a) safe, b) functional, c) in accordance with any related regs.

The idea is to have two independent lights that can be controlled via PIR or manually overridden, preferably without killing power to the PIR to avoid reboot sequence.

Sleeving will be used on the 7 core flex (Brown for both live and switched live)

Is there anything I might have overlooked?

 

[sparkymarka]

I wouldn’t ….I would rather do the below or a digi zone

 

[bernardgreen]

It would be better to have permanent Live to the PIR. This would avoid problems that can occur when a PIR sensor is switched on.

Using a colour other than Brown ( such as Red ) for the Switched Live wire would help with clarity when wiring ( and later fault finding )

 

[RockySundae]

I did consider permanent live but thought that if the PIR had a fault in future there would be no way to easily turn it off without pulling the switch out, though looking now having to do this would also mean not being able to use either lamp too.

Is there anything in the regs about colour codes for switched lives?

It would be better to have permanent Live to the PIR. This would avoid problems that can occur when a PIR sensor is switched on.

View attachment 300086

Using a colour other than Brown ( such as Red ) for the Switched Live wire would help with clarity when wiring ( and later fault finding )

 

[SUNRAY]

I take it your original cable run wasn't as straight forward as you implied?

 

[SUNRAY]

I assume you realise you are proposing virtually the same thing from a few days ago.

Then you seemed to indicate the existing wiring was already at or near the switch position,

 

[RockySundae]

Indeed the same thing just a more fleshed out diagram with proposed cable types/sleeving etc to see if anyone highlights any issues - wasn't sure whether to put it in the old thread.

The existing wiring is currently a 2 gang plate with 3 core + PE out to the external junction box off of a RCCB protected lighting circuit - planning to swap this wiring for a 7 core flex.

View attachment 300135
I assume you realise you are proposing virtually the same thing from a few days ago.

Then you seemed to indicate the existing wiring was already at or near the switch position,

 

[flameport]

two independent lights

Is this 300 watt piece for illuminating a football stadium?

 

[SUNRAY]

Indeed the same thing just a more fleshed out diagram with proposed cable types/sleeving etc to see if anyone highlights any issues - wasn't sure whether to put it in the old thread.

The existing wiring is currently a 2 gang plate with 3 core + PE out to the external junction box off of a RCCB protected lighting circuit - planning to swap this wiring for a 7 core flex.

Fromm your previous thread (yes it would be better to have continued it there) I got the impression the light cables were already connected at the switch or very easy to get them to there. If you can make all of the joints at the switch it will simplify things:

 

[RockySundae]

Is this 300 watt piece for illuminating a football stadium?
View attachment 300196

It's a long narrow garden

Fromm your previous thread (yes it would be better to have continued it there) I got the impression the light cables were already connected at the switch or very easy to get them to there. If you can make all of the joints at the switch it will simplify things:
View attachment 300201

Ah thanks, wasn't sure on the forum etiquette here and whether thread commenters were notified of new replies - I'll keep that in mind for next time

There is currently a 2G switch on the wall as a spur supplied from the lighting circuit which is protected with 6A mcb and 30ma RCCB, and a 3 core cable from there to the exterior. I considered running the 2x3c and 1x4c cables all to the switch but thought it might get a little cramped with only a 25mm deep back box

 

[EFLImpudence]

Is there anything in the regs about colour codes for switched lives?

No distinction is made between switched or not.

From the Regulations: Table 51:

 

[RockySundae]

No distinction is made between switched or not.

From the Regulations: Table 51:

View attachment 300203

Huh, TIL - only ever seen brown/red lives in domestic applications really, thank you

 

[SUNRAY]

No distinction is made between switched or not.

From the Regulations: Table 51:

View attachment 300203

Isn't that list related to things like ELV / control etc?

EDIT: just noticed it's even in the post.

 

[EFLImpudence]

Yes, 'etc.' being "other applications".

It was the answer to Rocky's question following Bernard's suggestion.

Using a colour other than Brown ( such as Red ) for the Switched Live wire would help with clarity when wiring ( and later fault finding )

Is there anything in the regs about colour codes for switched lives?

 

[SUNRAY]

Yes, 'etc.' being "other applications".

It was the answer to Rocky's question following Bernard's suggestion.

OK.
I must be honest I think our requirements for brown or blue sleeves on everything is way over the top. Going back a few years using 3C&E for 3 lives was automatic and never a thought of oversleeving as they were/are phase colours. The only time I have concerns is when a colour is used for an opposing voltage use such as blacks and blues as SL. Of course currently they are reversed to previous colour code and greater care is required in mixed schemes .

Opening and reinstating a 4gang intermediate plate with 8 off. 3C&E cables containing 16 5mm sleeves (or even 24 sleeves when someone has been over zealous with brown sleeves on r, y, b cables) becomes a job and a half.