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Home > Residential > Get Electricity > TNB Electricity System

DEFINITION

“Domestic Consumer” means a consumer occupying a private dwelling, which is not used as a hotel, boarding house or used for the purpose of carrying out any form of business, trade, professional activities or services.

Get Electricity

Get all the information you need to provide electricity for your house.

Start & Stop Electricity Change of Tenancy Upgrade / Downgrade Electricity Change of Tariff Connection Charge Security Deposit TNB Electricity System SLA Between TNB and Housing Developers Self Meter Reading

TNB ELECTRICITY SYSTEM

Learn more about TNB electricity system.

Voltages

TRANSMISSION

500kV, 275kV & 132kV

DISTRIBUTION

33kV, 11kV & 400/230 volts
22kV & 6.6kV (certain parts of Johor)

SUPPLY FREQUENCY

50Hz ± 1%

Earthing System

High Voltage & Extra High voltage Medium Voltage Low voltage 400/230V
3 phase configuration 3 phase configuration 3 phase 4 wire system
Solidly earthed or impedance earthed Solidly earthed or impedance earthed Neutral point solidly earthed.
Overhead lines and underground cable are used extensively for high and extra high voltage distribution Overhead lines and underground cable are used extensively for medium voltage distribution Mixture of overhead lines and underground cables and aerial insulated cables.

SHORT CIRCUIT RATINGS

Here are the maximum fault levels for various voltage systems:

System Short circuit rating
500kV 50kA, 1s
275kV 40kA, 3s (50kA, 1s for substation adjacent to Power Station, or within 500kV substation)
132kV 31.5kA, 3s (40kA, 3s for substation adjacent to Power Station, or within 500kV/275kV substation)
33kV 25kA, 3s
22kV 20kA, 3s
11kV 20kA, 3s
6.6kV 20kA, 3s
400/230V 31.5kA, 3s

Act, Regulation and Code

The electricity supply and installation practices in Peninsular Malaysia are governed by:

Electricity Supply Act 1990 - Act 447

Licensee Supply Regulations 1990

Electricity Regulations, 1994

Occupational, Safety & Health Act 1994

Malaysian Standard MS IEC 60364 Electrical Installation of Buildings

Electricity Supply (Amendment) Act 2015 [Act A1501]

Electricity (Amendment) Regulations 2013 P.U.(A)151

Electricity (Amendment) Regulations 2014 P.U.(A)73

Electricity (Amendment) (No.2) Regulations 2014 P.U.(A)136

SUPPLY VOLTAGE OPTIONS

Supplies to domestic premises are given at single phase 2-wire or three phase 4-wire. However, the actual supply voltage provided depends on the magnitude of your load requirements.

Low Voltage Medium voltage & high voltage
Single-phase, two-wire, 230V, up to 12kVA maximum demand Three-phase, four-wire, 400V, up to 72kVA (100A) maximum demand Three-phase, four-wire, C.T. metered, 400V, up to 1000kVA maximum demand Three-phase, three-wire, C.T. metered

Voltages other than the above classifications cannot be provided by TNB. However, you may opt to make your own transformation arrangements where necessary.

ADDENDUM ON ELECTRICITY SUPPLY APPLICATION HANDBOOK (ESAH)


To download the Electricity Supply Application Handbook (ESAH), Click Here. 

Also Available:

  • Substation Design Booklet
  • CSU Plinth Design
  • PIAT Civil Checklist for 11kV Substation
  • Anti Climb Fence 2019
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