Get all the information you need to provide electricity for your business.
Learn more about TNB electricity system.
50Hz ± 1%
|High Voltage & Extra High voltage||Medium Voltage||Low voltage 400/230V|
|3 phase configuration||3 phase configuration||3 phase 4 wire system|
|Solidly earthed||Impedance-earthed (NER)||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||Overhead lines and underground cable are used extensively for low voltage distribution|
Here are the maximum fault levels for various voltage systems:
|System||Short circuit rating|
|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)|
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
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.
Voltages other than the above classifications cannot be provided by TNB. However, you may opt to make your own transformation arrangements where necessary.