The whole of the Electrical Services throughout the Building have been installed
on the screwed welded conduit system with ironclad type switchgear. A three-phase
four-wire, 415/240 volt supply has been brought into the Building, terminating in
an Intake Chamber in the Basement allocated to the Supply Authorities, from which
electricity is supplied to the Main Switch-room, also situated in the Basement, through
duplicate main cables.
The Switch-room equipment comprises two incoming oil circuit breakers supplying power,
heating and lighting ,bus-bar chambers having metal-clad switch fuse-gear mounted
thereon, from which current is distributed to the various distribution centres. The
whole of the incoming supply is metered in the Switch-room on the outgoing power,
lighting and heating sections. From the Switch-room, main cables are run to the various
rising main switchgear enclosures which are situated in convenient positions in the
centre section of each half of the Building. These cable are run vertically through
all floors of the Building and feed the various services on each Floor.
In the switch gear enclosures the whole of the metal-clad sub-main switchgear, distribution
boards, etc., is mounted on angle iron framework supports.
The Offices and Works Sections of the Building are separately controlled, and lighting
and power circuits have been installed in a manner to suit exactly the requirements
of the Works and Offices layout, special attention being paid to the question of
accessibility both as regards. control and individual points. All lights are switched
on individual circuits or grouped in suck a manner to suit the Works requirements.
For an emergency or standby supply for lighting purposes, a storage battery is installed,
with rectifier and trickle charging equipment. The emergency lighting service is
controlled by an automatic contactor control unit which switches all emergency lighting
over to the battery in the event of a failure on the main supply. Corridor and staircase
lighting is incorporated in the emergency system, and also lights in various sections
of the Works and Offices.
Special arrangements have been made to allow the secondary lighting system to be
employed by the night watchman as a pilot service.
The Building is equipped with G.P.O. telephone, system, having a 100 line switchboard
situated in a central position in the Building.
For inter-communication within the Building, a very complete 100 line automatic inter-house
telephone system has been installed, representing the very latest development in
automatic telephony, and includes a number of instruments installed with loudspeakers
and special push button facilities for calling selected Departments, obviating the
necessity of dialling. The system also permits of priority calls, conference and
For fire protection, besides the installations mentioned under Mechanical Services,
a fire alarm system has been installed. When any fire alarm is put into operation,
indication is immediately given by visible and audible signals in the Watchman's
Office. The visible signals indicate from which point of the Building the fire alarm
emanated. The installation also includes a system of signalling throughout the Building,
operated from the Watchman's Office, which enables the whole of the Staff in the
Building to be warned that a fire has occurred, and that the Building is to be vacated.
Electric clocks are installed throughout, on the impulse system. The master clock
is situated in the Watchman's Office, operating the various out-station clocks in
A programme repeater installation is included in the clock system, to automatically
operate bell signals in various sections of the Building on a pre-selected programme,
to indicate to the occupants starting and stopping times of work. A special feature
is incorporated to automatically cut out this service during weekends and holidays.
For the convenience of calling principal Members of the Staff who may be in different
parts of the Building, a system of Staff Signals has been installed, in conjunction
with the clock dials. The clock numerals are illuminated, and each executive has
an allocated number on the clock dial. To call any particular person, instructions
are given to the telephone operator to put out that person's call. The telephone
operator switches on the selected circuit, and the particular numeral is then illuminated
on the clock faces.
The Secretary's Office with the Clock used in the Signalling System
In addition to this Staff Signal System, other systems are installed for special
inter-communicating signals between Departments.
The lighting system throughout has been designed to accommodate the detailed requirements
of the Company, the Main Showroom being lighted by a daylight and luminous balustrade
around the gallery. In certain internal rooms artificial. illuminated windows have
been incorporated. Throughout the various rooms direct and indirect lighting schemes
have been employed. The main facade of the Building is floodlit, while the main Ground
Floor show windows are equipped with a multiple of lighting points to permit of any
decorative feature required. Such circuits can be controlled either manually or by
The whole of the motive power for the Boiler House, air conditioning plant and Works
Sections of the Building, is supplied by electric motors arranged with automatic
push button control. In the Boiler House a central indicator panel is installed,
upon which indicators are given regarding the, operation of the various motor driven
For the Works requirements as regards electrical services, motor generators and transformers
have been installed, supplying various A.C. and D.C. voltages, to enable testing
of the Works products to be carried out under actual operating conditions prevailing
in the District or part of the country to which they are .to be dispatched
For the electro-plating, electro-typing, nickel-plating and cleaning processes necessary
for the Works, four rectifiers have been installed, having outputs of 100 to 500
amperes, at 3 to 6 volts.