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Voltage Indicator & Proving Unit Calibration

Penpoll 77
Should voltage indicators & proving units be calibrated annually yes or no? rationale for either answer would be appreciated thanks.
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    They generally test at 690 volts, that will light all the lamps in the voltage indicator, but I’d refrain from pushing the test leads of your installation testers into it.


    You are testing it everytime you use it, assuming you are using it correctly, why would it need calibration?


     Andy
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    They generally test at 690 volts, that will light all the lamps in the voltage indicator, but I’d refrain from pushing the test leads of your installation testers into it.


    You are testing it everytime you use it, assuming you are using it correctly, why would it need calibration?


     Andy
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