Mortuary Body Store
(32 body racks)
34°F.
Pathology Cold Room
40°F.
Pathology Deep Freezer
4°F.
Kitchen Cold Store
34°F.
Pharmacy Sterile Store Blood Bank
40°F.
X-Ray Film Store
40°F. 55°F.
The rooms are all refrigerated by electrically operated plants which except for kitchen cold store. incor- porate duplicate or standby condens- ing units.
Radiology
In order to economise on the space required, by airconditioning cabinets. three large floors, including a light well are served by a single central station. and space is reserved for special charcoal filters to be installed later. if required, in the return air passage to eliminate smells which may arise from the personal examina- tion of many patients for certain
treatments.
Special chilled water supplies have been arranged both for film pro- cessing units and the plants which serve the Betatron and two Linen Accelerator Deep Therapy Installa- tions.
In the Pathology Department a special ceiling fan heater is being fitted to give temperature controls of :: 1°F.
As a result of policy changes oc- curring during construction, the ad- ditional air conditioning for offices has been provided by means of small individually controlled fan coil units which are fed with chilled or hot water from the central system.
Self-contained window type room coolers of one and a half h.p. capacity were installed in the Neurosurgical Ward and also for a few first class wards for use with skin or other special medical treat-
ments.
Where special electrical equip ment is stored in areas where the airconditioning is normally turned off after working hours, and for a few other special stores, small de- humidifiers are installed to keep the humidity down to below 50%.
100
ELECTRICAL SERVICES
(1) General
This electrical sub-contract. which includes over 100 miles of conduits. 325 miles of wiring cables and five miles of underground cables, over 10.000 lighting points and 4.500 socket outlets. is thought to be the biggest single electrical installation in hospital buildings ever carried out in the Commonwealth.
Most of the electrical installation equipment such as the main switchboard and bus bar
bar rising mains were manufactured in the United Kingdom to the special de- signs of the electrical engineers. The electrical installation was planned, supervised and commissioned by the electrical engineers who had main- tained close liaison with the architect. structural engineers, airconditioning and mechanical engineers. specialist sub-contractors or suppliers and medical department.
a
In order to achieve economy considerable amount of equipment has been designed and manufactured locally using imported components and accessories.
(2) Supplies
to
the
The electrical supply Hospital is obtained from a supply company sub-station which has been incorporated into the main Hospital building and includes two 1.500 K.V.A. transformers which are fed from two different high tension sources in order to avoid any pos. sible interruption to any electrical services.
In addition a third 500 K.V.A. transformer has been installed for the supplies to various X-Ray diagnostic machines and all the special deep therapy equipment such as the tatron and linear accelera- tors which must be operated under stable supply voltage conditions.
In the event of mains failure a 680 kilowatt standby diesel electric generator would be started up manually in order to maintain the essential electrical services through- out the Hospital such as for all operating theatre suites, lifts, boiler plants and lighting for passages and stairs etc.
In addition non-maintained type battery cubicles together with charg- ing facilities are provided in all operating theatre suites, the boiler plant, main switchroom and genera- for house for maintaining adequate illumination before the supply is available from the standby generator.
(3) Main Switchboard and Distribution System
The medium voltage main switch- board comprises fused switches and aircircuit breakers and is mounted in cubicles and divided into three sec- tions. one per transformer. The m.v. boards have bus couplers between setions with necessary interlocking features and it is possible, depend- ing on the load, to feed all three sections from two transformers. should the third transformer fail or be required for maintenance. The essential supply switchboard is incor- porated with one of the above section on-load switchboards through an isolator which is normally closed and interlocked with the standby genera. tor incoming switch (off load isola- tor) by a castel key. Both main sections of the board have an inde pendent incoming supply through separate 3000 amp. isolators which are fed to 3.500 amp. busbars. The remaining section is fed by one 1000 armp. isolator from the 500 KVA transformer.
Medium voltage distribution from the main switchboard to six sub-main switchboards situated at various locations in the basement of the building is principally in plastic main cables. PVC insulated and sheathed and steel wire armoured except that paper-insulated lead covered and armoured cables are Plastic used for the plant room. main cables are also used for out. going sub-mains cable from each sub-main switchboard to the foot of various rising main ducts and also to the adjacent buildings such as sisters & nurses' quarters. house officers quarters, menial staff quar- ters and specialist clinic etc.
In view of the large number of service pipes being installed in the basement. all distribution cables are fixed to the ceiling at appropriate levels by means of bracket and special cable support equipment of British manufacture.
THE HONG KONG & FAR EAST BUILDER VOLUME 18, NUMBER 5
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