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Legend: Explanations & Illustrations Rationale Note Revision history


5.2.1 Installations requiring primary and secondary power supplies

Where any of the following installations is required by this Code or other Codes/ Regulations, its primary and secondary source of power supply shall comply with the corresponding Code of Practice stated therein.

a. Electrical lifts


Where an electrical passenger or goods lift is required, its electrical installations, including batteries and other forms of secondary power supply, shall comply with SS 550. Where the provision of fire lift is required by this Code, installation of the primary and secondary supplies shall also comply with the above- mentioned Code of Practice.

b. Electrical fire alarm system


Where electrical fire alarm system is required, its primary power supply as well as its type and capacity of battery shall comply with SS CP 10.

c. Exit light and emergency lighting systems


Where exit or emergency lighting system is required, its electrical wiring, type and capacity of battery or other form of secondary power supply shall comply with SS 563.

d. Emergency voice communication system


Where an emergency voice communication system is required, its electrical wiring shall be fire-rated or otherwise fire-protected in accordance with SS 546. The appropriate type and capacity of secondary source of supply shall also be provided accordingly.

e. Wet rising main system


Where a wet rising main system is required, the relevant electrical supply shall be installed in accordance with SS 575. A secondary source of power supply with capacity stipulated in SS 575 shall be provided for the wet rising main pumps.

f. Fire sprinkler system


Installation of electrical supply for sprinkler systems shall comply with SS CP 52. The capacity of the secondary source of supply, where required, shall satisfy operational requirements under the respective hazard category.

g. Mechanical ventilation/pressurisation systems


The following systems shall be provided with secondary source of power supply:

(1) mechanical ventilation system for the following rooms or spaces:

(a) exit staircases;

(b) exit passageways;

(c) smoke-free/fire lift lobbies;

(d) area of refuge within the same building;

(e) basement car parks;

(f) fire command centres;

(g) emergency power generator rooms;

(h) engine driven fire pump rooms;

(i) rooms involving the use and/or storage of flammable liquid/gas and explosive substances;

(j) any other areas where such systems are installed for fire precautionary measures; and

(2) pressurisation systems for the following areas:

(a) smoke-free/fire lift lobbies;

(b) internal exit staircases;

(c) hotel corridors;

(d) hostel corridors;

(e) healthcare corridors; and

(f) any other areas where such systems are installed.

(3) all smoke control/purging systems, including associated equipment forming part of the systems.

h. Air supply system for generator and fire pump


A secondary source of power supply shall be provided for the mechanical ventilation system which is installed to
provide air for the operation of the following equipment:

(1) emergency generator; and

(2) engine driven fire pump.

5.2.2 Cable installation

Power supply cables for equipment that are required to operate during a fire emergency shall be of fire resistant type. The fire resistant cables shall comply with SS 299.

5.2.3 Electric motors and control equipment

All motors and their control equipment, as well as the associated wiring and accessories, shall be suitable for their particular application and for the environment they are exposed to. In addition, they shall comply with all of the following requirements:

a. High Rupturing Capacity Fuses (HRC) or Moulded Case Circuit Breakers (MCCB) with magnetic release shall be installed and be capable of protecting the cable connections to the motor, and of carrying the stalled current of the motor for a period not less than 75% of the period for which such a current would cause the motor windings to fail;

b. any no-volt release mechanism shall be of the automatic resetting type, such that on restoration of supply the motor can start automatically;

c. thermal overload trips shall not be permitted; and

d. magnetic (short circuit) trips are permitted for use in motor circuits of mechanical ventilation systems serving essential services.

5.2.4 Emergency generator


a. Where emergency generators are provided as a secondary source of supply, they shall comply with SS 535.

b. For outdoor emergency generator, all of the following requirements shall be complied with:

(1) Day tank incorporated within the body of the emergency generator shall be constructed of steel. The day tank shall
be of double skin construction. The emergency generator enclosure shall be able to contain any leakage of diesel.

(2) Alternatively, an internal bund wall shall be built within the outdoor emergency generator’s day tank large enough
to contain 100% of the diesel content within the day tank.

(3) The maximum quantity of diesel permitted in the day tank is 1000 litres.

Updated 1 March 2023