Discuss EM lights M and NM in the Electrical Forum area at ElectriciansForums.net

C

crabapple

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my understanding

Emergency lights come in 2 general varieties, maintained and nm

their functions;
1 u have directional ones directing ppl (green running man)
2 anti panic ones to illuminate spaces
3 high risk task area one

at least 1 lux along directed routes

finally maintained ones on the final exit

questions

i wire the above 3 in TE with a key switch

but how are the final exit maintined ones to be wired - im using 3 core
 
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G

Guest55

  • Thread Starter Thread Starter
  • #2
swopping between maintained / non-m is usually by removing or adding a small wire link inside the light fitting.
 
C

crabapple

  • Thread Starter Thread Starter
  • #3
how are the maintained ones to work??
do they always be on??
are they switched
do they have to be on both sides of the exit?
 
C

crabapple

  • Thread Starter Thread Starter
  • #4
also the documentation that asks for records of weekly, monthly and six month checks needs filling
do i need any other documenttion for thee?
 
P

Ponty Massive

  • Thread Starter Thread Starter
  • #5
Maintained, non-maintained and switched non-maintained.

M and NM can be wired in 2 core, M will remain illuminated at all times regardless if powered or not (up to 3 hours) where as NM will only illuminate in cases of power failure.

You can buy a switched NM, this can be used as a normal light but will also illuminate in case of power failure. For this type you will need 3-core, L-N + Sw.

Hope this helps

Ponty !
 
P

Ponty Massive

  • Thread Starter Thread Starter
  • #6
also the documentation that asks for records of weekly, monthly and six month checks needs filling
do i need any other documenttion for thee?
I normally do monthly check, power off an a quick once round. 6 monthly check, power down for 3 hours, clean out lense, replace lamps etc.
 
F

Farmelectrics

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Arms
maintained are allways on were non miantained are usually off
 
Taylortwocities

Taylortwocities

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Esteemed
Arms
do they have to be on both sides of the exit?
"The safety of occupants must be protected until they are away from the influence of the building. If the area outside the building has hazards in darkness such as a river bank the risk assessment should determine if further emergency luminaires are needed till a place of safety can be reached.
If street lighting is available and adequate it may be used with the agreement of the fire authority."

Most fire authorities require an EM on the outside of a final exit door. You may be able to convert and existing outside lamp to provide this facility.

Are you sure that you are competent to do this work? Emergency lighting is not just about the exit door, there are a lot of other places where it may be necessary.

Take a good long look at these two documents
http://www.icel.co.uk//media//technical/5 -CEL 1006 Emergency Lighting Design Guide 3-3-09.pdf
http://www.icel.co.uk//media//technical/6 - ICEL 1008 Risk Assessment Guide 3-9-09.pdf
 
C

crabapple

  • Thread Starter Thread Starter
  • #9
Are you sure that you are competent to do this work? Emergency lighting is not just about the exit door, there are a lot of other places where it may be necessary.

Take a good long look at these two documents
http://www.icel.co.uk//media//technical/5%20-CEL%201006%20%20Emergency%20Lighting%20Design%20Guide%203-3-09.pdf
http://www.icel.co.uk//media//technical/6 - ICEL 1008 Risk Assessment Guide 3-9-09.pdf[/QUOTE]

job description;

flats on 2nd floor
each has a nm above the front door inside
outside flat there are directional ones and open area illumination ones interspersed.
the stairwell is perpendicular to corridor so above is a green nm pointing down
above stairs there is a cupboard of the flat that cuts into space above stairs but i have a clear one to illuminate all stairs nm
on reaching bottom(1stfloor) there is a directional one to direct into lobby
another directional one directs to 2nd stair
above stairs is a green directioal one pointing down
a half landing is reached where there is another directioal one
at bottom (ground floor) is final exit (m. em. l.)

1st floor is a hall

it has open area nm aprox every 5m radius(rsj cut ceiling into 4)
it has 2 exits both have directional

one of the exits is mentioned above, but will be primarily for flat occupants
the other on exiting comes to stairs (3 steps) above which is a directioal nm to illuminate stairs and direct. the landing does a 180 and stairs contue down to ground above which is a nm directioal emergency. on ground floor is a final M exit

ground floor is like the hall above exit is clear, have open area nm interpersed with normal lights

there is a kitchen that has em lights as it is a high risk task area and have nm and open area nm. it joins to the ground hall but has is own M exit

i have down the work and want my own certainty and peace of mnd before any or regulations

ive reffered to the EM Light OSG

but still unsure about final exits
 
C

crabapple

  • Thread Starter Thread Starter
  • #10
if a em light comes off a lighting cct it has a key switch in between
but if they are all wired together they have a key switch by the cu ( where i put it)


Q


where in the cu do u put this cct on a high integrity board??
 
N

needasparks

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Arms
The emergency lights should be conected to the circuit of general lighting of the area it covers or the lighting may go off and the emergency lights won't come on redering them useless.
 
T

TF28

  • Thread Starter Thread Starter
  • #12
Final exit signs or change of direction signs signs are generally to be illuminated at all times, a key switched feed , N and earth are all thats needed on a maintained fitting
 

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