PURPOSE
The Guidelines For Electrical Wiring In Residential Buildings
been prepared as a wiring guide for all Wiremen and Electrical Contractors for undertaking electrical wiring in residential buildings to conform to the
Electricity Regulations 1994.
The Guidelines are prepared in a concise and compact manner to facilitate the electrical wiring of residential buildings to be done adequately and to ensure its safety of use while meeting basic wiring requirements.
The Guidelines will also be useful for owners of residential buildings or wiring installations to recognise the requirements of safe and adequate electrical wiring.
It is hoped that the Guidelines will ensure that electrical wiring will be based on correct safety procedures and regulations and to avoid possible electrical accidents. Safety requirements in electrical wiring works have to be met to eliminate accidents causing physical injuries and loss of life or
property. These requirements are as stated in Appendix 1.
ELECTRICAL WIRING
3.1 Legal Requirements
Regulation 11(1) of the Electricity Regulations 1994 states that all wiring or rewiring of an installation or extension to an existing installation, which shall be carried out by an Electrical Contractor or a Private Wiring Unit,
have to obtain the approval in writing from a licensee or supply authority.
3.2 Planning of Electrical Wiring Work
Prior to carrying out wiring work, the wireman/contractor should plan and
determine the tasks to be undertaken so that the work carried out is tidy, neat and safe to be used. The wireman/contractor shall: -
i. Undertake a site visit;
ii. Determine the consumer load requirements;
iii. Calculate the maximum load demand; and
iv. Submit the plans, drawings and specifications.
The planning flow chart for building wiring installations is as shown in
Figure 3.1.
3.2.1 Site Visit
The purpose of the site visit is to determine: -
i. Electrical equipment suitable for use;
ii. Maximum load demand;
iii. Single or three phase incoming supply;
iv. Type of wiring; and
v. Equipment arrangement.
3.2.2 Determining Consumer Load Requirements
With the aid of the building floor plans, the installation requirements such as the proposed load, placement of electrical equipment and
installation design plans can be determined.
3.2.2 Calculating Maximum Load Demand
The estimate of the maximum load demand is for determining the specifications of the wiring equipment such as the cables and accessories and subsequently to prepare the electrical installation plans.
According to clause 311 of MS IEC 60364 Part 1, to determine the maximum demand for each circuit while ensuring an economic and
reliable design within the permitted voltage drop limits. Diversity factors may be taken into account. The maximum current demand calculations for each circuit must be
prepared. These details will show the current requirements, in amperes, for each phase and also assist in determining the cable
sizes.
Refer to the Third Schedule (Table A and Table B) and Regulation 11(2) of the Electricity Regulations 1994 to estimate the maximum current demand and the diversity factors that may be used for domestic installations.
Download Timer
