UKAS & BSI
UKAS & BSI
A proving unit does not actually measure anything, it is a device used as a known voltage source to verify that a voltage detector is accurately detecting voltage during the safe isolation process. Proving units are small battery powered devices with their own indicator system to ensure they themselves are working correctly before they are used to verify a voltage detector. There are a wide variety of devices available with AC and DC voltage options ranging from 12 to 700v
Like most devices used in the field, they can be susceptible to water, dirt and general heavy use, that’s why it’s important to maintain a testing schedule of all proving units and other voltage detection products. The conditions mentioned can have an adverse impact on accuracy and if they aren’t picked up by annual calibration it could put the safety of operatives at risk.
Calibrationhouse as part of the Seaward Group benefits from 40 years of experience in design, manufacturing, and calibration of proving units, particularly its PH3 and PH3-LLT models that are used exclusively with our live line testers and other high voltage detectors. We recommend a minimum period of 1 year between calibration of these devices.
Our proving unit calibration service is available onsite at customer premises or in our Durham based laboratory. Please note that certificates of conformance will be issued for these devices as there are no measurements to report on a calibration certificate.