28-06-2013, 02:35 PM
DESIGN ASPECTS OF EMERGENCY LIGHTING
DESIGN ASPECTS 1.ppt (Size: 367.5 KB / Downloads: 85)
The Need for Emergency Lighting
If artificial lighting is installed in any public access building Emergency Lighting is a mandatory requirement
Provides light when the ordinary lighting fails due to a power cut and it is essential in safeguarding the occupants of a building in conjunction with other safety equipment
Strict legal regulations governing Emergency Lighting - must be regularly tested which is the responsbility of the owner/occupier
Legal Requirement Installation - Emergency Lighting Certificate
All premises when handed over to the client must be certified to IS3217:1989 which consists of a certificate signed by the consulting engineer , the installer and commissioner .
This standard primarily dictates types and positions of Emergency Fittings .
Certification
Recognised independent test house approves construction to the relevant European standard.
Certified products ensures that products conform to all relevant EMC and LV Directives (CE).
Certified inverters (to EN60924) conform to relevant safety and operating standards.
Fitting Types
Emergency lighting can be one of two system types:
Self-Contained - each fitting has a board and battery
Centrally supplied - each has a slave board, no battery Slave fittings are powered by CBS.
Product types are available as slaves or self-contained
Converted product-mains fitting converted to illuminate escape route
Bulkhead - illuminates escape route
Exit Sign-Illuminated directional sign
Twinspot - illuminates high bay/open areas.
Categories
Non-Maintained
lamp only lights when mains fail.
Maintained
Lamp can light when mains is present and will light when mains fail.
Sustained (Combined)
There are two lamps, one only works when mains fail and the other only works when mains is present.
Impact of low mercury fluorescent lamps
Why is this important ?
It has implications for emergency (DC) operation .
A variety of existing control gear are not designed to strike lamps with reduced mercury content .
Problem manifests itself as mercury migration to one end of the lamp i.e. insufficient mercury is released and ‘pinking’ occurs followed by lamp failure .
A solution to this is to ensure emergency control gear can run all new low mercury / amalgam lamps