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
READ MORE

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:                                                                                                                                                                                                                                                                              

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
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
  • Licensee Supply Regulations 1990
  • Electricity Regulations, 1994
  • 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 72kVA (100A) maximum demand
  • Three-phase, four-wire, C.T. metered, 400/230 V, up to 1000 kVA maximum demand

Medium­ Voltage ­&­ High­ Voltage

  • Three-phase, three-wire, 11kV for load of maximum demand 1,000 kVA to 5,000kVA
  • Three-phase, three-wire, 22kV for load of  maximum demand 1,000kVA to 10,000kVA
  • Three-phase, three-wire, 33kV for load of maximum demand 5,000kVA to 25,000kVA
  • Three-phase, three-wire, 132kV and 275kV for exceptional high load maximum demand above 25,000kVA

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.

Year:

View All

Description Date
View All
X

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.
READ MORE

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.

Year:

View All

Description Date
View All
X

How to Register as a TNB Electrical Contractor

Learn more on How to Register as a TNB Electrical Contractor
READ MORE

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 myTNB Self Service Portal.

Year:

View All

Description Date
View All
X

Electricity Supply Application Handbook (ESAH)

Click here to learn more about the Electricity Supply Application and download the handbook.
READ MORE

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

Addendum on ESAH V3:

Item Section Addendum Page in ESAH Effective Date
1.0 Tenaga Nasional Berhad Electricity System 1.4.5  Short Circuit Ratings

Type of short circuit rating for system voltage of 275kV

7 26/08/2015

1.5.1  Supply Application Based on Load

Type of supply elaborated more on type of connection 8 4/03/2016
1.5.6  Multi Tenanted Premises

Options for multi tenanted commercial premises to take bulk supply or individual landlord / tenant connection scheme and drawings as reference for individual landlord / tenant connection scheme.

10 25/03/2016
2.0 Electrical Supply Application For Load Up to 100 kVA

2.2  What The Applicant Should Do

Addendum is to suit the new individual supply application process 12 4/03/2016

2.3 What The Electrical Contractor Should Do

13 4/03/2016
3.0 Electricity Supply Application For Load Exceeding 100 kVA

3.3 Application Parts (Part B : TNB Application Process (Technical & Financial Approval))

14 4/03/2016

3.4 What The Applicant Should Do

17 4/03/2016
3.0 Supply Schemes 3.2.1  Substation Categories

Addendum to expand use of compact substation at new commercial development area, and to align requirement of substation type to Table 3-2 (Requirement of substation for single Development)

33 25/03/2016
3.2.2 Land or Building Size Requirements For Sub-Stations 11kV and belows Amendment on substation size where average building size does not include land setback requirement

Latest edition of “Buku Panduan Piawai Rekabentuk Pencawang Elektrik” is available to be downloaded from TNB Website

35  
3.2.3  Type of firefighting system for the Substations

Addendum to elaborate type of substations for firefighting system installation, and the requirement of firefighting system product certification by TNB.

36 25/03/2016
2.0 Single Phase Metering 2.3 Height of Meter Position

Height of the meter board in consumer’s premise at the wall reviewed

43 28/12/2015

4.0 Group Metering For Single Phase and Three Phase Whole Current Supply

4.1.2  Commercial Premises (excluding shop lots) Arrangement of meters for individual landlord and tenants supply scheme for multi tenanted commercial premises. 46 25/03/2016

Extra Low Voltage

  New voltage level definitions according to Electricity Supply Act 1990 & MS EC 60038 : 2006 59 21/11/2012

Low Voltage

Medium Voltage

High Voltage

Extra High Voltage

Electricity Supply Application Exceeding 100kVA Checklist For Consultant Engineer

  Consultant Checklist is amended to ensure clear understanding on supply application requirement Appendix 5  
Power Quality Declaration Form  

Power Quality Declaration Form is reviewed base on the latest requirement

Appendix 8  
Drawing No. A(i) : Shop Lots Meter Panel  

Amendment on Shop lots Meter Panel drawing where cable entry height  increased to 750mm

Appendix 18  

Makluman Am Untuk Electricity Supply Application Exceeding 100kVA

  This new appendix is to ensure consultant & developer understand civil & electrical requirement of substation 11kV and below New Additional Appendix  

Also Available:

Year:

View All

Description Date
View All
X