Emergency Light

[bobby62]

What is the correct definition for an emergency light fitting which is an emergency version of a standard fitting, it needs to come on and go off with the rest but also come on or stay on in the event of a fire.

Am I correct in saying this is a 'maintained' emergency light ?

 

[holmslaw]

..

 

[bobby62]

No, what you describe is 'non maintained', 'maintained' emergency lights are never turned off eg EXIT signs.

Thanks, I thought 'non-maintained' were lights which were 'off' all the time and only came on during a fire alarm situation, i.e. EXIT signs over doors

 

[RF Lighting]

It is a maintained fitting which you want.

They have a permanant supply to them for charging of the batteries and mains fail detection, and a switched live for them to operate like normal lights in normal circumstances.

Holmslaw doesn't have em lighting in his mud hut.

 

[Adam_151]

It is a maintained fitting, whether or not it is on 24/7, on when the lights are on, or controlled by a secret key with when there is function on, etc, its still a maintained fitting.

Though some of the cheaper exit signs can't take a separate switchfeed, they just have a link to drop out to choose from maintained in the 24/7 varient or non-maintained, and while you could fit a switch in the place of a link, you are limited to one fitting per switch as to do otherwise would end up with the input fuse in the fittings being paralleled up.

But both fittings would be called maintained

 

[ricicle]

You both beat me to it. Certain maintained fittings have to remain lit at all times when the building is occupied and some can operate as normal fittings as well. Either way they will operate from emergency source when there is a power failure.

Non-maintained will only operate under power failure.

Holmy, if you want to disagree read BS5266

 

[holmslaw]

..

 

[Taylortwocities]

So, Bobby's light is what is known as a switched maintained light.

That is if the same light is illuminated from the (switched) light feed or from the battery in the event of power fail.

A sustained fitting has two lamps. One used for normal switched operation, the other for emergency / power fail situations.

I hate to say this, but Coldslaw is right on the absolute definition of maintained. It is defined as being on all the time during normal and emergency situations (eg building exit lights).

 

[RF Lighting]

What is the correct definition for an emergency light fitting which is an emergency version of a standard fitting, it needs to come on and go off with the rest but also come on or stay on in the event of a fire.

Am I correct in saying this is a 'maintained' emergency light ?

No, what you describe is 'non maintained'

2.19
non-maintained emergency lighting
a lighting system in which all emergency lighting
lamps are in operation only when the supply to the
normal lighting fails"

Consistent if nothing else

 

[ricicle]

Holmy, if you want to disagree read BS5266

From BS5266

"2.15
maintained emergency lighting
a lighting system in which all emergency lighting
lamps are in operation at all material times
2.16
material times
times during which the emergency lighting is
required to be illuminated, e.g. at all times that
persons are on the premises, or at the times the
main lighting is not available, according to the
regulations, conditions of certificate or licence as
appropriate

2.19
non-maintained emergency lighting
a lighting system in which all emergency lighting
lamps are in operation only when the supply to the
normal lighting fails"

Which is exactly what I said and is not what you said

 

[thomo27]

there is also sustained emergency lighting which would be for an example a recessed fitting 600x600 with two or more lamps, at least one of which is energised from the emergency supply and the remainder from the normal supply

 

[surreal]

What is the correct definition for an emergency light fitting which is an emergency version of a standard fitting

If it's an emergency pack in a general luminaire it's classed as non-maintained. This means that the battery pack will only be used if the additional permanent supply to that particular luminaire fails

it needs to come on and go off with the rest but also come on or stay on in the event of a fire.

Why does it need to come on in the event of a fire? Before you answer, please read all parts of BS 5266 and part B of the building regs.

Am I correct in saying this is a 'maintained' emergency light ?

I'm afraid not. A maintained luminaire is one which is illuminated all of the time and should the normal supply be lost a battery will take over and keep it illuminated for an additional 3hours

 

[surreal]

there is also sustained emergency lighting which would be for an example a recessed fitting 600x600 with two or more lamps, at least one of which is energised from the emergency supply and the remainder from the normal supply

If the emergency lamp is only illuminated in a mains failure condition this luminaire is regarded as non-maintained.

I've never seen a central system feeding one lamp in a luminaire, but I'm sure they exist.

 

[Taylortwocities]

Why does it need to come on in the event of a fire? Before you answer, please read all parts of BS 5266 and part B of the building regs.

Call me Mr Stupid, if you like, but there is no fire detection circuitry in these lights. The emergency part (ie the battery/inverter) operates when the mains supply is switched off.
Something else will have caused the supply to fail. That something may be a fire, maybe not.

there is also sustained emergency lighting which would be for an example a recessed fitting 600x600 with two or more lamps, at least one of which is energised from the emergency supply and the remainder from the normal supply

I wish I had mentioned sustained emergency lighting....

oh, but I did

A sustained fitting has two lamps. One used for normal switched operation, the other for emergency / power fail situations.

 

[thomo27]

Why does it need to come on in the event of a fire? Before you answer, please read all parts of BS 5266 and part B of the building regs.

Call me Mr Stupid, if you like, but there is no fire detection circuitry in these lights. The emergency part (ie the battery/inverter) operates when the mains supply is switched off.
Something else will have caused the supply to fail. That something may be a fire, maybe not.

there is also sustained emergency lighting which would be for an example a recessed fitting 600x600 with two or more lamps, at least one of which is energised from the emergency supply and the remainder from the normal supply

I wish I had mentioned sustained emergency lighting....

oh, but I did

A sustained fitting has two lamps. One used for normal switched operation, the other for emergency / power fail situations.

So you did I must have missed your comment..

you stroppy barsteward