FOR POWER OUTAGE OR BREAKDOWN, PLEASE CALL 15454
FOR POWER OUTAGE OR BREAKDOWN,
PLEASE CALL 15454

TNB Electricity System

Learn more about TNB Electricity System
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Voltages

The transmission voltage networks are 500kV, 275kV and 132kV, whilst the distribution voltages are 33kV, 11kV and 400/230 volts. However, in the case of certain parts of Johor & Perak, the distribution voltages may also include 22kV and 6.6kV.

Supply­ Frequency

The supply frequency is 50Hz ± 1%.

Earthing­ System

High­ Voltage­ and­ Extra ­High­ Voltage

     
  • 3 phase configuration
  •  
  • Solidly earthed or impedance-earthed
  •  
  • Overhead lines and underground cable are used extensively for high and extra high voltage distribution

Low­ Voltage­ 400/230V

     
  • 3 phase 4 wire system
  •  
  • Neutral point solidly earthed mixture of overhead lines, underground cables and aerial insulated cables
  •  
  • Mixture of overhead lines, underground cables and aerial insulated cables

Short­ Circuit­ Ratings

As a guide, the maximum fault levels for the various voltage systems are as follows. All equipment proposed to be installed and connected to TNB supply must comply with the stated short circuit ratings:

                                                                                                                                                                                                                                                                                           
SystemShort 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
400/230 V 31.5 kA

Act,­ Regulation ­and­ Code

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

     
  • Electricity Supply Act 1990 - Act 447
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  • Licensee Supply Regulations 1990
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  • Electricity Regulations, 1994
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  • Occupational, Safety & Health Act 1994
  •  
  • Malaysian Standard MS IEC 60364 Electrical Installation of Buildings

Supply­ 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. * certain parts of Johor and Perak only Generally, 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 the individual applicant’s load requirements: Low­ Voltage

     
  • Single-phase, two-wire, 240 V, up to 12 kVA maximum demand
  •  
  • Three-phase, four-wire, 415 V, up to 45 kVA maximum demand
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  • Three-phase, four-wire, C.T. metered, 400/230 V, up to 1000 kVA maximum demand

Medium­ Voltage ­&­ High­ Voltage

     
  • Three-phase, three-wire and 11 kV for load of 1,000 kVA maximum demand and above
  •  
  • Three-phase, three-wire, 22 kV or 33 kV for load of 5,000 kVA maximum demand and above
  •  
  • Three-phase, three-wire, 66 kV, 132 kV and 275 kV for exceptionally large load of above 25 MVA maximum demand

It should be noted that voltages other than the above classifcations cannot be provided by TNB. However, consumers can make their own transformation arrangements where necessary.

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SLA Between TNB and Housing Developers

All housing developers are encouraged to sign the SLA (Service Level Agreement). The objective of the SLA is to ensure electricity supply is connected to housing projects within the stipulated time to avoid delays in handing over houses to the purchaser.
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All housing developers are encouraged to sign the SLA (Service Level Agreement). The objective of the SLA is to ensure electricity supply is connected to housing projects within the stipulated time to avoid delays in handing over houses to the purchaser. The SLA is open to all housing developers applying for electricity supply for housing developments as prescribed under the Housing Development (Control & Licensing) Act 1966. Commercial and industrial development projects are not covered by the SLA. Timeframe allocated to complete the works is not more than 18 months from the date of signing the Agreement, or shorter if mutually agreed by both parties.

Typical timeframe for connection of supply within 18 months:

Description: la timeline

Roles and Responsibilities

What the Developer should do
     
  1. Submit application form with the relevant documents required by TNB
  2.  
  3. Sign SLA with TNB (provided all documents are in order)
  4.  
  5. Pay connection charges upon notification from TNB within agreed timeframe
  6.  
  7. Substation to be built and completed 4 months prior to electricity supply ready for connection
What TNB should do
     
  1. Sign SLA with developer
  2.  
  3. Issue Notice of Connection Charges within 2 months after SLA Agreement is signed
  4.  
  5. Commence works no later than 4 months prior to electricity supply ready for connection

Cost

The cost incurred is only the stamp duty. The Agreement should be stamped after execution by both parties and each party should bear its own stamp duty, currently at RM10 per copy.

Penalty Clause

Compensation will be paid by both parties if they fail to fulfill their respective obligations under the SLA.

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How to Register as a TNB Electrical Contractor

Learn more on How to Register as a TNB Electrical Contractor
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Step 1:

You need to register as an electrical contractor approved and certified by the Energy Commission

Step 2:

Submit the registration form together with a valid Contractors License from the Energy Commission at our Customer Service Centre (Customer Service Centre is subject to the area where the company chooses to perform the work e.g. if you are operating in Klang, go to our Klang branch to register)

Step 3:

The Customer Service Centre will update your company information into the system

Note: To register as a TNB e-Contractor, go to our E-Application now!

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Electricity Supply Application Handbook (ESAH)

Click here to learn more about the Electricity Supply Application and download the handbook.
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To download the Electricity Supply Application Handbook (ESAH), click here Also available:

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