2391-51 Online Exam

[Raymond Cordiner]

Hello everyone,

I'm looking for any advice at all on passing this online exam.

I have completed everything else without any problems including the 2391-50 but have failed this one three times now and twice only one question away.

I am not an electrician so probably found it harder than most (I was an electrician's mate for about 6 years) and my job involves security electronics. I put myself through this course to take on RCD testing alongside my own job.
The college course requirements was basic electrical knowledge but this is far from it, and the course wasn't really taught as it was assumed you would already know or get from GN3.

I have just failed on "understand the requirements for testing electrical installations during periodic inspection and test, and scraped through understand the requirements for the periodic inspection of an electrical installation.

The one question that pops up is "what would the expected resistance be of 10mm CPC at a length of 20 metres at 20c the answer I get is nowhere near any of the multiple choice answers so any explanation of how to do this would be much appreciated. This was part of the course work that was not delivered to us.

I have found some of the questions are tricky as the answers could possibly be one or the other!

Any advice at all would be appreciated guys!

Thanks,

Raymond

 

[Raymond Cordiner]

No worries mate.
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When you have a question just ask yourself what am I being given and from this what do I need. You needed one thing, the resistance of the conductor because the answer is a resistance and knowing this the 10mm is not relevant in the calculation.

That's a great tip westward. I think that's how I'm finding some of the questions can be either one or two answers, I just need to take a minute and break it down like you say.

I can't thank you enough for your help!

Cheers mate!