Emergency Lighting Design

[telectrix]

Ledridge Lighting 8W LED Emergency Bulkhead Maintained Warm White | Energy Save Lighting Low Price LED Light Bulbs & Commercial Lighting


no brainer at this price.

 

[industryspark]

Cheers guys

The problem is that the fittings were aquired before i even knew about the job.....there's about 40 of them to wire in at various locations!! So its looking like it'l have to be these maintained fittings. The reason for wanting them to come on with normal lighting is so the exit points are clearly marked (thats in the remit for the job).

But it is desirable for the owner that they be turned off at night when the building is empty.

which is why the wiring for them is proving a little tricky!

Regards

 

[telectrix]

Varilight Z2DG201DKW 20A Double Pole Key Switch White | Screwfix.com

use 1 pole for the perm. L, and the other for the switched L. then when you operate the keyswitch, both feeds to the EM will be cut.

 

[telectrix]

E14 3W LED = 35W Halogen (Candle) - 210 Lumens, Small Edison Screw Cap LED Light Bulbs, E14 Lighting

like this but 5 or 6 watt would be more suitable

 

[dazza1981]

Telectrix im relatively new in the electrical game so im keen to learn everything my brain will cram in.
when you say use a 20 amp double pole key switch do you mean that that switched live and perm will come from the normal light switch next to it and as long as the key switch is closed it will work threw that,if that makes any sense mate.
Only reason i ask is because the op says he wanted to switch the em/lights with the normal lights at the switch

 

[telectrix]

using a 2 pole keyswitch, take L through key to L on em. then take sw.l from normal light switch and feed through other pole on k/s to L1 on em. that way the k/s will cut both live feeds to em.and the normal switch will cut the switched L when the lights are turned off.

 

[dazza1981]

Thats what i thought, i never would of thought of doing that...... easy when you know how.
Thanks alot tel

 

[industryspark]

Ahh, i see how you can do it now.

To clarify, a permanent live (lets say straight from lighting circuit mcb) runs through one pole of the keyswitch to supply the fitting permanent live.
Then the live from the normal light functional switch passes through the keyswitch other pole to the sl on the EL. If i feed this live off to the normal lights before it passes through key switch i can remove all power to the EL's whilst keeping the normal lights on.

Correct?

 

[telectrix]

egggsackkly.

 

[dazza1981]

And if you have a perm live and a neutral at your existing light switch it makes it even easier as you can just run a three core from there.
p/l s/l and neutral

 

[industryspark]

Appreciatte the input guys.

Ive been doing plenty of research the last few days regarding the requirments and its a far more indepth subject than one would first think.

The workshops i am installing the E-lights in are lit by discharge fittings (SON/MH) spread across 3 phases ( i.e workshop A has 12 lights, 4 on L1, 4 on L2 and 4 on L3 with a 3 gang gridswitch). I take it im ok supplying all the EL's (for a particular workshop) from just one phase so id then have a 4 gang gridswitch (1 gang for the keyswitch module) with all the EL's say from L3?

Couldnt find anything in BS5266 regarding this today although it seems like the only way it should be done?

Regards

 

[dazza1981]

Wheres telectrix??????? he will know straight away

 

[telectrix]

strictly speaking the em's should be tied to the individual light circuits.your way means that if the lights on L1 and L2 failed, the em's would not activate unless L3 circuit went down.

 

[Tiny Spark]

Appreciatte the input guys.

Ive been doing plenty of research the last few days regarding the requirments and its a far more indepth subject than one would first think.

The workshops i am installing the E-lights in are lit by discharge fittings (SON/MH) spread across 3 phases ( i.e workshop A has 12 lights, 4 on L1, 4 on L2 and 4 on L3 with a 3 gang gridswitch). I take it im ok supplying all the EL's (for a particular workshop) from just one phase so id then have a 4 gang gridswitch (1 gang for the keyswitch module) with all the EL's say from L3?

Couldnt find anything in BS5266 regarding this today although it seems like the only way it should be done?

Regards

If I am understanding you right then what you are suggesting would put a 415v potential in the light fittings if you are running your lights from L1 but have L3 for the Perm supply?

 

[industryspark]

mmm, see the argument telectrix but even if L1 and L2 was lost the EM's would still be on (they are exit sign bulkheads above doorways which is why the client wants them on the whole time the place is 'open' - hence the desire they come on with normal lighting).

So if L1 and L2 are lost the EM's are still on and there would be adequate lighting from the 4 normal fittings of L3 to be able to aid escape aswell.