Emergency key switch wiring

[dave19]

Hi Guys,

Can you help ? I just wanted to know how you wire a key switch and normal switch together. Is this how it should be :-

Feed from board to common on key switch
power to emergency lights comes off the load side of key switch
loop feed comes off the common side of key switch to common side of normal switch then
power to normal lights comes off load side to normal switch.


Is this it and if not is there a different way of doing it. Please explain in as simple terms as you can. Diagrams would also help ? Thanks guys.

Dave.

 

[capitolltd]

Shouldn't the lights be tested at a time of low risk to allow time for the batteries to be recharge in accordance with BS5266? Why would you need the lights to then remain on?. Generally unless an indicator is wired into the circuit to indicate emergency testing, switching off all the lights is the preferred method as this reduces the risk of the lights not being re-energised after test. However, the designer will identify the risks and design accordingly.
Those electricians that undertook the old AM2, would remember the wiring of such a neon at the switch position during the exam.

 

[Adam W]

theres no talking to you Adam , every debate ends in a --- for tat childish strop where you have to have the last word.

All I said was it would be easier to test the lux level of the emergency lights if only the emergency lights were on.
Maybe I sometimes embellish my hypothetical scenarios a little, but on the whole the ideas are perfectly feasible and I don't know why you can't get your head around them.
Take this one - "light diffusers might get dirty". What is so bizarre about that? It happens all the time.

 

[Guest55]

well if you clean and lamp change the emerg lights on a regular basis you dont need to turn the lights off for the whole building just to see if light output has dropped.

its called preventative maintenance - fix the problem before the problem occurs.
its a very simple concept.
ffs.

 

[Landril]

Em lighting needs to be planned well, if u mess up the wiring it can cost u a lot of time(=money) to fix wiring issues.
It is all client based with regards to preference of how it is tested, u need to wire it with the client and regs in mind.
General rule of positions is change in level or direction too remember.Clients sometimes don't know we're em lights need to be positioned.

 

[Adam W]

well if you clean and lamp change the emerg lights on a regular basis you dont need to turn the lights off for the whole building just to see if light output has dropped.

its called preventative maintenance - fix the problem before the problem occurs.
its a very simple concept.
ffs.

I know what preventative maintenance is thank you, but no amount of cleaning the diffuser and changing the lamp every year is going to stop a luminaire becoming less efficient over time. It seems it would be far simpler just to only have the emergency lights on and walk around with a lux meter so you have an actual number to work with; when it falls below a certain level that's the time to change the fitting.

 

[electric will]

I also think the em switches should only knock the power off to the em lights, this leaving normal lights on. You can always manually turn these off to measure the lux levels.
other side of the coin, em lights in areas with windows letting daylight in, how can you wire the em switch to knock the sun out?

 

[Adam W]

Do the test when it's dark?

 

[Guest55]

I know what preventative maintenance is thank you, but no amount of cleaning the diffuser and changing the lamp every year is going to stop a luminaire becoming less efficient over time. It seems it would be far simpler just to only have the emergency lights on and walk around with a lux meter so you have an actual number to work with; when it falls below a certain level that's the time to change the fitting.

that just sounded like a load of white noise to me.

 

[Landril]

other side of the coin, em lights in areas with windows letting daylight in, how can you wire the em switch to knock the sun out?

U build a big sun blocker like mr.burns did in the Simpsons if course :/

 

[Guest55]

Do the test when it's dark?

then why bother wiring the main lights to go off during emerg. tests in the first place ????
lol.

 

[Landril]

Out of interest adam what is the lux level required !!

 

[Guest55]

keep going adam , each post is getting more ridiculous and desperate.

 

[Adam W]

that just sounded like a load of white noise to me.

It was perfectly simple to understand.

 

[electric will]

Do the test when it's dark?

yes, so if your doing the same test and need the normal lights off, you switch them off and carry out the test as you've just suggested.

 

[Adam W]

then why bother wiring the main lights to go off during emerg. tests in the first place ????
lol.

I already explained that.