The test lamp or voltage detector should be proved
to be working on a known live source, proprietary
proving unit or in-built test feature before and after
use. All line, neutral and protective conductors of the
circuit should be tested and proved to be dead.
Electricians who regularly work on installations that
have been energised should be equipped with
devices for proving that conductors are dead.
Electricians who may occasionally work on
installations that have been energised should have
ready access to devices for proving conductors dead.