High Voltage

We are experts in high voltage testing

We've been designing and manufacturing high voltage test equipment for over 37 years and continue to innovate and bring the best instruments to the market. Choose from phasing sticks, safe discharge rods, voltage indicators and more. Whatever your high voltage test requirements are, we have a solution for you.

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Proving Units


Phasing Sticks


Voltage Indicators

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Also available...

Voltage Detectors

Current Measurement

Safe Discharge Rods

About High Voltage

What is High Voltage testing?
Circuits and equipment are generally classified as ‘high voltage’ when they have a nominal voltage exceeding 1000 volts AC or 1500 volts DC. High voltages are generally found in the electrical distribution network where it is common to see systems operating at 11,000 VAC, 33,000 VAC, 132,000 VAC and even 400,000 VAC.

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How to carry out High Voltage Testing?
There are many standards and procedures which related to high voltage testing, often these have been created by the generation company or distribution network operator and form the basis for their staff safety training. Earlier we mentioned the process of safe isolation and this basic practice forms the starting point for most high voltage training courses around the world.

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Why carry out High Voltage Testing?
There are many forms of testing that can be carried out on high voltage systems, but by far the most common is voltage detection or voltage indication, this is the process of checking that a voltage is present or not in a particular part of a high voltage system.

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Case Studies

AGL-5 enhances safety for airfield ground-lighting AGL-5 enhances safety for airfield ground-lighting
AGL-5 enhances safety for airfield ground-lighting

The new AGL-5 two-pole voltage detector is specially designed for use on Airfield Ground Lighting (AGL) systems. It enables service engineers, maintenance personnel and airport te...

Dedicated New HV Training Centre Equipped with Specialist Seaward Test Equipment Dedicated New HV Training Centre Equipped with Specialist Seaward Test Equipment
Dedicated New HV Training Centre Equipped with Specialist Seaward Test Equipment

A new high voltage (HV) electrical training facility has been equipped with specialist test equipment from Seaward to ensure the highest standards of technical tuition and learnin...

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