Notice of Amendment of Power Quality Standards


This circular is to inform interested parties relevant amendments have been made to the standards related voltage sag. The amendments made in response to the amendments on the Electricity Supply Act (ESA) 1990 [Act 447] and Electricity Regulations 1994,  is to introduce Fourth Class (Class 4 test level) for compliance testing of voltage dips, voltage variation and short SEMI F47 that resembles the interruption. The fourth class is suitable for the semiconductor industry.

The standards are:

  1. MS 61000-4-11:2015 -Electromagnetic compatibility (EMC) – Part 4-11: Testing and measurement methods Voltage dips, short interruptions and voltage variations immunity tests (Second revision) (IEC 61000-4-11:2004, MOD); and
  2. MS 61000-4-34:2015 – Electromagnetic compatibility (EMC) – Part 4-34: Testing and measurement techniques – Voltage dips, short interruptions and voltage variations immunity tests for equipment with mains current more than 16 A per phase (First revision) (IEC 61000-4-34:2009, MOD).

These standards can be obtained at SIRIM.

The circular can be found in Energy Commission website as per link below:

For further enquiries, feel free to contact the Senior Assistant Manager, Mr Farhan at +603-79848636 or email:



MBAM Circular
Pekeliling Suruhanjaya Tenaga Bil. 01/2017

error: Content is protected !!
copyright protected