Emergency lights ctu

[Ma12967]

Hello,

I have emergency lights that require a ctu. They are a mixture of non maintained and maintained. Do I need a contactor and a ctu? If so how do I go about wiring this?

Thanks

 

[James]

what is a ctu??

 

[mainline]

what is a ctu??

Basically a switch to disconnect the mains to test the batteries.

https://www.garo.co.uk/docs/2020/specs/DCTU%20SPCE.pdf

 

[Ma12967]

Basically a switch to disconnect the mains to test the batteries.

Any idea of the wiring of this? Do I need a contactor or can I just use a ctu? Thansk

 

[James]

ah, I would know that as an emergency lighting test switch or secret key switch.

 

[mainline]

Any idea of the wiring of this? Do I need a contactor or can I just use a ctu? Thansk

How many emergency lights are there.

 

[Ma12967]

How many emergency lights are there.

There’s only 6. I thought I might be able to just put a ctu there?

 

[mainline]

There’s only 6. I thought I might be able to just put a ctu there?

If they are all off one supply at the CU then a CTU would be the easiest.

 

[Ma12967]

If they are all off one supply at the CU then a CTU would be the easiest.

That’s what I was thinking? What do I do with the ctu? Take a feed from mcb to ctu then put cable going out to lights into ctu aswell? Never installed one before been stuck house bashing for too long!

 

[timhoward]

That’s what I was thinking? What do I do with the ctu? Take a feed from mcb to ctu then put cable going out to lights into ctu aswell? Never installed one before been stuck house bashing for too long!

That is certainly one option with a wago for the neutral.

 

[mainline]

That’s what I was thinking? What do I do with the ctu? Take a feed from mcb to ctu then put cable going out to lights into ctu aswell? Never installed one before been stuck house bashing for too long!

Feed from mcb/rcbo to ctu then to light feed.

 

[westward10]

Are these all connected to a dedicated circuit.

 

[Ma12967]

Are these all connected to a dedicated circuit.

Yeah they are

 

[westward10]

You can't do that with non maintained fittings they must operate upon failure of the local general lighting.

 

[Ma12967]

You can't do that with non maintained fittings they must operate upon failure of the local general lighting.

So I need to link them to the general lighting? How do I go about that?

 

[westward10]

Maintained are fine as they are permanently illuminated but imagine non maintained which is not. You put one in a room then you would want it to operate if the general lighting failed. I would recommend you find an electrician who is conversant with BS5266 you can't just throw some in and hope for the best.

 

[mainline]

So I need to link them to the general lighting? How do I go about that?

Is there one supply for the lights ? Or a dedicated contactor/s.

 

[Ma12967]

Is there one supply for the lights ? Or a dedicated contactor/s.

One supply for emergency’s and one supply for general lights

 

[mainline]

One supply for emergency’s and one supply for general lights

And what sort of lights are they ?

Maintained, Non-maintained or Sustained ?

 

[Risteard]

what is a ctu??

Central Test Unit. Common in the south of Ireland.