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TNB Electricity System
VoltagesVoltages
The transmission voltage networks are 500kV, 275kV and 132kV, whilst the distribution voltages11kV and 400/230 volts. However, in the case of certain parts of Johor & Perak the distribution voalso include 22kV and 6.6kV.
Supply FrequencySupply Frequency
The supply frequency is 50Hz ± 1%.
Earthing SystemEarthing System
High Voltage and Extra High Voltage
3 phase configurationSolidly earthed or impedance earthedOverhead lines and underground cable are used extensively for high and extra high voltag
Low Voltage 400/230V
3 phase 4 wire systemNeutral point solidly earthed mixture of overhead lines, underground cables and aerial insuMixture of overhead lines, underground cables and aerial insulated cables
Short Circuit RatingsShort Circuit Ratings
As a guide, the maximum fault levels for the various voltage systems are as follows. All equipmebe installed and connected to TNB supply must comply with the stated short circuit ratings:
System Short circuit rating for 3s
500 kV 50 kA
275 kV 40 kA
132 kV 31.5 kA
66 kV 20 kA
33 kV 25 kA
22 kV 20 kA
11 kV 20 kA
6.6 kV 20 kA
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TNB Electricity System
SLA Between TNB and Housing
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How to Register as a TNB
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400/230 V 31.5 kA
Act, Regulation and CodeAct, Regulation and Code
The electricity supply and installation practice in Peninsular Malaysia are governed by the followin
Electricity Supply Act 1990 - Act 4471. Licensee Supply Regulations 19902. Electricity Regulations, 19943. Occupational, Safety & Health Act 19944. Malaysian Standard MS IEC 60364 Electrical Installation of Buildings5.
Supply Voltage OptionsSupply Voltage Options
Supply may be provided at any of the declared voltages:
275 kV, 132 kV, 33 kV, 22 kV*, 11 kV, 6.6 kV* and 400/ 230 V.
Generally, supplies to domestic premises are given at single phase 2-wire or three phase 4-wire. actual supply voltage provided depends on the magnitude of the individual applicant’s load requi
Low Voltage
Single-phase, two-wire, 240 V, up to 12 kVA maximum demand1. Three-phase, four-wire, 415 V, up to 45 kVA maximum demand2. Three-phase, four-wire, C.T. metered, 400/230 V, up to 1000 kVA maximum demand3.
Medium Voltage & High Voltage
Three-phase, three-wire and 11 kV for load of 1,000 kVA maximum demand and above1. Three-phase, three-wire, 22 kV or 33 kV for load of 5,000 kVA maximum demand and abo2. Three-phase, three-wire, 66 kV, 132 kV and 275 kV for exceptionally large load of above 2demand
3.
It should be noted that voltages other than the above classifcations couldn’t be provided by TNB.consumers can make their own transformation arrangements where necessary.
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