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I wouldn't make any assumptions that a consumer has a reliable voltage tester and is testing it properly before they test for dead or is locking the means to re-energise the circuit.
Agree. There are people who can't change a lightbulb or wire a plug.
I do think that technical, able people (like Rogan) who 'get' systems and know they need to train themselves before doing something 'technical' in nature will do enough due diligence and buy the tooling (and test it!) required to minimise the risk of zapping themselves and / or setting themselves a trap for later though :)
Could be wrong. I'm not dead yet, have done many light fittings in our gaff. But then I grew up doing electrical shit / nerdery.
In my experience most consumers up to untrained professionals have no idea about the rules and recommendations surrounding even the most basic test meter. There's quite a lot of specific basic process that even the trained professionals are being doubly encouraged and reminded to follow.
I wouldn't make any assumptions that a consumer has a reliable voltage tester and is testing it properly before they test for dead or is locking the means to re-energise the circuit.