Volume 8 – Mechanical and Electrical Services - Malaysia Geoportal

Chapter 7 ELECTRICAL SERVICES
7 ELECTRICAL SERVICES
7.1 INTRODUCTION
Electrical installation work is generally governed by The Electricity Supply Act 1990, and Electricity
Supply Regulation 1994.In addition, The IEE Wiring Regulations 16 th Edition (BS7671:1992)
establishes the standard of wiring design and installation works.
7.2 ELECTRICAL DRAWING DESIGN
Electrical design, cost estimation, and drawings are the major workload of electrical service. As such
this paper is aimed at giving the procedures generally involved in these aspects of the works which
covers design, cost estimation, and drawings of electrical installations for buildings, plants, and
machineries etc.
7.2.1 Design Procedure and Criteria
A good and functional design is one that is safe, workable, and economical, complies with the
relevant regulations and is convenient to the user.
All design must comply with:
a) The Electricity Supply Act 1990.
b) Electricity Supply Regulation 1994.
c) The IEE Wiring Regulations 16 th Edition (BS7671:1992).
d) Department of Health and Safety Requirement.
e) Illumination Engineering Society (IES) (UK) Code of Practice.
7.2.2 Coordination with Other Consulting Engineers and Authorities
It is necessary for Electrical Engineer to maintain closer liaison with the Architect, and Civil &
Structural Engineer for the building layout. The mechanical services proposed location, and their
respective power requirement must be obtained from the Mechanical Engineer. It is also essential to
consult the client for his requirement regarding the usage of the layout and equipments details if
they are separately purchased by the client directly. Finally, the amount of finance available for the
work shall be established.
A preliminary design is then effected to determine the loading requirement of the installation. The
estimated electrical loading will provide fundamental data to establish type of power tariff to apply
for power supply from TNB. The power tariff will decide the type of substation, or switching station
required by TNB. Similarly the owner’s plant room requirement will vary with different power tariff
approved. Once the load details and location intake have been tentatively proposed, the Architect, or
the C & S Engineer shall agree with the overall site plan layout.
Once the site layout has been finalized, the initial load data has to be prepared and submitted to the
Supply Authority that is TNB. All submission to TNB shall comply to TNB’s Guide book. All TNB’s
requirement such as substation, switching station etc., must be clearly indicated to the Architect and
the C & S Engineer. The client shall be advised with proper Electricity Tariff for application of power
supply to TNB.
When all parties have agreed with the requirement of loading obtained, detailed design and drawings
can commence.
March 2009 7-1