Basic Testing Procedures

[electromonkey]

Cheers Sintra. That's a handy additional piece of info for determining ages of installations.

 

[Fender]

Is there any reason why a multimeter cant b used to test safe isolation? ie:voltage?

 

[Sintra]

A multi meter should not be used for safe isolation as it may be set in various positions.
For example you start of with it on the ac voltage setting but in the middle of the procedure you inadvertently move the selector to a different range which could prove fatal.

The reason the proper test equipment to GS38 should be used is to remove the possibility of human error.

 

[Fender]

Thanks m8, that was a recent exam question. My answer was that it wasnt an "approved" voltage indicator.

 

[1ManRiot]

Great thread. I've only recently begun my journey into the world of electrics (on a Network Rail apprenticeship) but I overheard some of the questions asked my by an interviewer to an interviewee, some of which are answered by this opening post, so I've printed this off for some bedtime reading!

 

[almac]

Can these procedures be carried out by non electricians... I have my city and guilds pat testing and an HNC in electronics wondering if that makes me competent?

 

[leascliffe]

The actual supply is not switched off, the installation past the main breaker is switched off granted but not the supply. Anyone just about to take the 2391 practical may be confused as books including GN3 and OSG use the CRIPLER method and this is the way i've been taught to test within my 2391 course;

Dead tests:

Continuity of circuit protective conductors
Ring final circuit conductor continuity
Insulation resistance testing
Polarity

Live Tests:

Loop impedance test external (Ze)
Earth fault loop impedances (Zs)
RCD testing

Hi,

Thanks to Sintra for the original post! I agree with SafetyFirst, we were taught the CRIPLER method when I did the C&G2392 a few months back.

 

[ROY2612]

Thanks for the great info. Cheers

 

[brav]

Except that you don't have to follow any particular order in the 2391, as it's a PIR that you are completing, not an Initial Verification.

You can basically test in the order that suits you best.

yeah u can do polarity at the same time as continuity using Method 1.

Cracking posts tho lads

 

[WhiskeyDog]

Can these procedures be carried out by non electricians... I have my city and guilds pat testing and an HNC in electronics wondering if that makes me competent?

Hi Almac, Ive read elswhere that you need the 2391 to prove you are competent to carry out these tests, unlike PAT testing where it was argued you did not the C&G to carry out PAT.