Ensuring Electrical Safety at Work
Take a look at our comprehensive range of Safe Isolation products and accessories.
View catalogueSafe Isolation saves lives
Check out our products and resources to enable safe working procedures when working with electrical systems. The comprehensive range includes lock-off devices, proving units and voltage indicators, helping you comply with the Electricity at Work Regulations.
Learn moreThink safety, think proving dead, think Martindale
Safe electrical working requires the use of a voltage indicator that has been proven with a proving device. The widest range of proving units available on the market, for use with 230V, 440V and 690V voltage indicators. Check out the full range.
Learn moreFAQs
- Do I need to get my voltage indicator and proving unit calibrated?
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As a manufacturer, we recommend a yearly calibration of voltage indicators and proving units from a traceable calibration lab. The items can be calibrated individually or both calibrated as a system.
- Do your VIs come with a certificate of conformity?
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Not as Standard. But we can provide one for free if requested at the point of order.
- Will the 50v LED will light up on the VI13800, if it detects a source of 12 volts?
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No, the VI13800 will start to illuminate around 42V but will not illuminate at such a small voltage of 12V.
- Can I use your proving unit with other manufacturers voltage indicators?
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Yes, Martindale proving units can be used with other manufacturer’s voltage indicators. Always remember to match the output of the proving unit to prove the full range of the voltage indicator you are trying to prove.
- Can I use a proving unit with my multifunction tester?
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Yes, a proving unit can be used with a multifunction tester to check the voltage measurement function. Most testers have a maximum input voltage of 500V to 600V so should not be over proved at a higher voltage.
The Martindale PD440SRDX 440V proving device is ideal and also features CALCHECK for verifying low resistance ranges.
Technical support
If you have questions related to Martindale products, please check our FAQ sections on our product pages, where the most common enquiries are answered.
Should you require further help please do not hesitate to contact the Martindale support team using the telephone number or email address below or complete the online form.
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