The latest edition of SANS 10142-1 The wiring of premises – Part 1: Low-voltage installations (Edition 3: 2020) has recently been published.

This vital standard is used in South Africa for all types of low voltage electrical installations.  The Occupational Health and Safety Act, 1993 (Act No. 85 of 1993) (OHS Act), which is administered by the Chief Inspector of Occupational Health and Safety of the Department of Labour, requires that electrical installations comply with the requirements of SANS 10142-1. It also requires that a registered person, as defined (master installation electrician, installation electrician or electrical tester for single phase), will issue a Certificate of Compliance for an electrical installation in line with the requirements set out in SANS 10142-1.

John Dlamini, Chair of the technical committee for this important standard, comments on the latest edition in following Q&A:

Q: Why was the standard revised?

SANS 10142-1 was revised due to the outdated requirements and to align better to the international norms. In South Africa we need to verify other technologies utilised by other countries and align local conditions with such technologies.

Q: What are the most important changes that have been made?

  • Reference to compulsory specifications (VCs) in table 4.1 has been removed. VCs should refer to standards not vice-versa.
  • Combine gas and electrical installation reequipments have been referred to SANS 10087-1
  • Introduction of arc fault detection devices in electrical installation.
  • Modification of earth continuity conductor requirements has been aligned with international norms and introducing a new table for earth continuity conductors and a new table for minimum size and maximum length of copper earth continuity conductors rated at 50% of phase conductor diameter, for general purpose circuit-breakers with instantaneous tripping current.
  • Introducing lightning protection requirements as well as informative annex which referrers to SANS 10313 and SANS 62305 series.
  • Reference to SANS 60439 has been replaced with SANS 61439 series. SANS 60439 series has been withdrawn by IEC 10 years ago. The rationale behind this is to be in line with the entire IEC National Committees which align with SANS 61439 series.
  • Medical location electrical installation requirements have been aligned with SANS 10142-1-1 and international norms.
  • Introduce an annex to provide information how to perform neutral earth resistance test.
  • Modify resistance of earth continuity conductor requirements.
  • Modify electrical installation test report and to introduce electrical installation test report for secondary distribution.
  • Modify electrical installation test report in hazardous location.

Q: Who will need to know of these changes?

Installation-electricians, single phase testers, master-electricians, electrical contractors, electrical inspection authorities, educational bodies responsible for electrical wiring curricula and examinations, consulting engineers, engineers, technologists and technicians, local supply authorities, and people working in the electrical industry at large including commerce and government departments, municipalities, medical location facilities, and installation component manufacturers.

Q: Other points of interest?

SANS 164-2 “effective from January 2018” configuration is now compulsory for electrical installation on newer buildings. However it is now compulsory for all new buildings to have a socket-outlet incorporating SANS 164-2 configuration. This has been modified in the current edition 3.

Some of the requirements for alternative supply have been kept in this edition 3.

To purchase the standard online:

For further information, please contact:

Standards Sales at the SABS

Telephone: 0861 277 227


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