I never terminated emergency lights back at the DB but i put them up.I wanna know do you use a contactor for them and what kinda batteries would you use for a central battery system(do you install an individual cabinet).If anyone could give me a link or something even i would appreciate it
Emergency lights
- Thread starter johnnyjb
- Start date
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unless there is a specific reason not to it is advisable to use self contained emergency light fittings, theese should be connected to the local lighting such that power to both the regular lights and the emergency lights fails at the same time in the event of a fire damaging/destroying cables.
central battery systems are pretty specialist, I don't know the details but I do know that they have to be wired in fire resistant cable (usually pyro). They are normally only used where self contained fittings are unsuitable (such as walk in freezers, you can't have batteries in a freezer).
central battery systems are pretty specialist, I don't know the details but I do know that they have to be wired in fire resistant cable (usually pyro). They are normally only used where self contained fittings are unsuitable (such as walk in freezers, you can't have batteries in a freezer).
As Plugwash says, unless there is a specific reason then the norm nowadays is to install self contained emergency luminaires which have their own battery pack in each fitting.
In a large installation however, instead of using fittings with a battery in each one, for maintenance purposes it may be preferable to have a distributed system with a central bank of cells (i.e. a battery). The ones I have dealt with were generally wet cells which needed topped up with water every so often, however they are tending to move onto different types of cells which do not require as much maintenance.
The size of the battery bank will depend on the load and how long you need it to last for, wether it is just for escape lighting or also to allow people work in the premises in a power cut etc.
In a large installation however, instead of using fittings with a battery in each one, for maintenance purposes it may be preferable to have a distributed system with a central bank of cells (i.e. a battery). The ones I have dealt with were generally wet cells which needed topped up with water every so often, however they are tending to move onto different types of cells which do not require as much maintenance.
The size of the battery bank will depend on the load and how long you need it to last for, wether it is just for escape lighting or also to allow people work in the premises in a power cut etc.
If you were usin the non maintained fittings and the light only came on when the power went off ,surely you wouldnt pull much of a load during normal operation,would it be just topping up the battery due to the battery discharging over time
Are you talking self contained or a distributed system?
The battery bank at the local theatre which I maintain has a trickle charge set to 20mA (distributed system). It is one which when the building is in use, the system is switched onto transformer supply so the lights are on all the time (maintained), in the event of a power failure a contactor drops out and puts it onto battery supply. When the building isn't in use the lamp output from the charger is isolated.
Normal self contained non maintained units won't take much current at all I would have thought.
The battery bank at the local theatre which I maintain has a trickle charge set to 20mA (distributed system). It is one which when the building is in use, the system is switched onto transformer supply so the lights are on all the time (maintained), in the event of a power failure a contactor drops out and puts it onto battery supply. When the building isn't in use the lamp output from the charger is isolated.
Normal self contained non maintained units won't take much current at all I would have thought.
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