Emergency Lighting

Emergency lighting has to provide defined levels of light to enable safe exit from a building when the mains power has failed. It has to switch on automatically and operate from batteries for at least two hours. There are 3 types of emergency fitting:

	Standard fittings with emergency gear installed. e.g. a batten.
	Specialised emergency fittings that only operate when the power fails. e.g. 10 Watt Q.I.
	Exit luminaires. These are normally on all the time.

Operational Definitions

For Single Tube Fittings:

Maintained	Non-Maintained
One Ballast	No Ballast
Lamp Always On	Normally off. Comes on when mains fails.
Two Mains Inputs

For Twin Tube Fittings:

Maintained (2 ballasts & 2 mains inputs)	Sustained (one ballast & 1 mains input)
Both Lamps on when Power On	One Lamp on when Power On
One Lamp on when Power Fails	Other Lamp Comes on when Power Fails

Non maintained not normally used in twin fittings.

ndLIGHT can fit emergency equipment into most of their fluorescent luminaires.