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.
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TNB ELECTRICITY SYSTEM
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Voltages
TRANSMISSION
500kV, 275kV & 132kV
DISTRIBUTION
33kV, 11kV & 400/230 volts22kV & 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.
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