We are one of a limited number of companies able to offer this G59/3 Testing service. We have a team of highly qualified competent G59 Testing Engineers and as such we can offer you a nationwide G59 testing service. We provide you with a reliable and professional service by providing you with one of our test engineers who have carried out many Witness tests and worked with many of the DNO's.


We have been testing under the new G59/3 regulations since April 2014 so have a good experience with G59/3. We have never so far had a G59/3 witness test failed so you can rest assured you will be booking one of our highly competent electrical engineer's to carry out your G59/3 witness test.


We are able to carry out Witness tests on the mojority of the main G59 relays used including;

  • ComAp
  • Woodward
  • ABB
  • Megacon
  • Bender


We bring all the required specialist equipment and paperwork required to carry out the tests to enable the DNO to sign your project off to be connected to the grid. We will be required to perform the following tests to prove your system falls within the required G59 parameters;

  • Under Voltage Stage 1
  • Under Voltage Stage 2
  • Over Voltage Stage 1
  • Over Voltage Stage 2
  • Under Frequency Stage 1
  • Under Frequency Stage 2
  • Over Frequenct Stage 1
  • Over Frequency Stage 2
  • Stability Tests
  • VectorShift
  • ROCOF (Rate of Change of Frequency)
  • LOM (Loss of Mains)

For your reliable and professional testing service contact us today to see how we can help.


G59 Services Limited

Unit 5A

Thomas Street



CW12 1QU

Phone: 0161 8717478


Email: sales@g59services.co.uk


Or use our contact form

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