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Clause 5.2 - PRIMARY AND SECONDARY POWER SUPPLIES

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

E

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

E

Where electrical fire alarm system is required, its primary power supply as well as its type and capacity of battery shall comply with SS 645.

c. Exit light and emergency lighting systems

E

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

E

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

E

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

E

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

E

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

Effective Date: 01 Mar 2019

(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.

Effective Date: 01 Mar 2019

h. Air supply system for generator and fire pump

E

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

5.2.4 Emergency generator

E

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.

Effective Date: 01 Mar 2019

5.2.3 Electric motors and control equipment