Safe Isolation

[Pete999]

Just like to get your vies/opinions on modern day voltage testers.

https://www.google.co.uk/search?q=s...t=firefox-b&gfe_rd=cr&ei=WmyLV7yIJsSFaNL0tKAH

The likes of those shown in the link, I was brought up with the John Drumond type, where to be able to prove safe isolation had been achieved you needed a proving unit.

Personally I have never used anything but my old trust JD set up, I was chatting to a newly qualified Electrician, and the question of safe isolation came up, he proudly produced is Stienel tester and when I asked him what sort of proving unit he had, all I got was a blank stare, he said his tester doesn't need to be proved using a proving unit, it is self proving and proceeded to show me.

Now comes the question, and to be honest I'm not sure of the answer, in my opinion and I could be wrong, all the internal test prove is that the electronic circuitry is working OK. Would love to hear some of your thoughts. Should they be tested with the use of a proving unit, as I said I have always used a JD indicator so I have no experience of the Stienel type.

 

[Pete999]

My old mentor use to lick his fingers, and dap it on the connection, lol

 

[DuaneMHunt1976]

My old mentor use to lick his fingers, and dap it on the connection, lol

One company i was at the manager/designed of hearing aids was testing the circuit with his finger. Lot lower power tho (he dose know that's turned on dosnt he!? Yep!) well the guy did suave WW2 In Belgium

 

[PEG]

Regardless of the detail of the current test device standard,it is surely obvious,that a test of whether or not a potentially lethal voltage is present,is double checked,with a likewise voltage.

The internal checking facility,in the devices discussed,does not do this.

A Lion blood/alcohol test machine,is calibrated with guess what...

...or would a quick rub with a wine-gum,suffice? :dozey: