SECTION 10:EMERGENCY AND STAND-BY SYSTEMS
SECTION 10
EMERGENCY AND STAND-BY SYSTEMS
1000 EMERGENCY SYSTEMS
1000-1 Emergency systems shall generally be provided in places of assembly where artificial illumination is required like buildings subject to occupancy by large number of people, hotels, theatres, multi-storey buildings, sports arenas, hospitals and similar premises and in such premises adequate illumination shall be provided from the emergency system to safely evacuate personnel. All stair ways, landings, exits and similar locations shall be provided with emergency lighting. This system shall also be capable of providing power to essential services and equipment in hospitals, refrigeration plants, in bulk cold stores, air conditioning systems in operating theatres, lifts, fire alarm systems, fire pumps, industrial processes equipment where an interruption of the normal supply would produce serious hazards, and for all other similar functions.
1000-2 The emergency system shall have adequate capacity and rating for the emergency operation of all equipment connected to the system.
1000-3 The emergency system shall be so designed and constructed that in the event of failure of the normal supply to or within the building, emergency lighting and emergency power where such is required, will be immediately available.
1000-4 The type of emergency system adopted shall depend upon the nature of the occupancy and the load and one of the following systems may be provided
- Storage Battery
A storage battery of suitable rating and capacity along with inverters etc. to supply and maintain at not less than 90 percent of the system voltage the total load of the circuits supplying emergency lighting and emergency power for a minimum period of 1.5 hours. The system shall be complete with automatic battery charging means.
- Generator Set
A generator set driven by a prime mover of suitable rating and capacity to supply and maintain at system voltage the total load of the circuits supplying emergency lighting and emergency power. Means shall be provided for automatically starting the prime mover on failure of the normal supply. Automatic means shall also be provided for transferring from the normal supply to the emergency supply those loads necessary during emergency. For hospitals, the transition time from the instant of failure of the normal supply to the emergency supply shall not exceed 10 seconds.
NOTE: EDD's approval shall be obtained for the type of automatic transfer from normal emergency supply.
- Built-in Equipment
Individual unit equipment for emergency illumination shall comprise of a rechargeable battery, a battery charging means, lighting fixture and a relaying device arranged to energise the lamps automatically upon failure of normal supply. The batteries shall be of suitable rating and capacity to supply and maintain at not less than 90 percent of the normal battery voltage, the total lamp load for a period of at least 1.5 hours.
1000-5 Prime movers associated with generator sets shall be provided with an on-site fuel supply sufficient to operate the prime mover for at least 3 hours.
1000-6 All circuit wiring for emergency system shall be kept entirely independent of all other wiring and equipment and shall not enter the same trunking or tray as normal wiring except in transfer switches, exit or emergency light fixtures, or where the wiring is common for both systems.
1005 STAND-BY SYSTEMS
1005-1 In addition to the emergency system due consideration shall also be given in the selection and rating of such systems to afford standby power also to non-emergency system during a failure of normal supply.
1005-2 For stand-by systems a manual or automatic change over from normal supply to standby supply shall be provided.
NOTE:
- Under no circumstances shall there be any possibility to back feed the generator set to the main network.
- E.D.D's approval shall be obtained for the type of change over system adopted from normal supply to emergency or stand-by supply.
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