How do I establish whether emergency lighting should be provided, & what are the requirements that have to be met ?

Consultation between the owner and/or occupier of the premises, the architect, the installation contractor and any other concerned should be arranged at an initial stage. It is also important the requirements of any national and/or local legislation which may apply to the premises in question are fully recognized and discussed at this time.

What are non-maintained, maintained and sustained emergency lighting system ?
• A non-maintained emergency lighting is a system in which all emergency lighting lamps are in operation only when the supply to the normal lighting or local and sub circuit fails.
• A maintained emergency lighting is a system in which all emergency lighting lamps are in operation at all times but can be turned on and off.
• Sustained emergency lighting is a system in which two lamps operate at all time and when there is a mains failure one of the lamps works on emergency.

What are the categories of emergency lighting?
Any emergency lighting system may be designed to supply the required light levels for any desired time. However, for most application, it is considered that at duration of between 1 and 3 hours should meet all normal requirements, code of practice for emergency lighting systems are categorized by the prefix NM' for Non-Maintained systems, 'M' for Maintained and 'S' for Sustained systems.

Which Category of system should be adopted ?
The type and category of emergency lighting systems to be used is dependent on the size and function of the premises. For different types of premises, there are statutory requirements relating to emergency lighting, and it is important that the appropriate authority is consulted. However, for most application it is considered that a duration of between 1 hour and 3 hours should meet all normal requirements.

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