Pre site inspection 2391-52 scenario | Page 2 | on ElectriciansForums

Discuss Pre site inspection 2391-52 scenario in the Electrical Course Trainees Only area at ElectriciansForums.net

The best tutors are like this. I had one in recent times that was perfect with his fluid maths and knowledge of theory, really knowledgeable guy. He wouldn't pretend to know anything or get stuck in his ways though. If he didn't know an answer he would say " I don't know, but I'll look it up and get back to you next session" Next session would come and he would say " Right, I've done some research, I've also chatted with my mates at the IET and NICEIC and the answer seems to be....."
Every day's a school day, even for the teachers.

Your checking of Ze where others would not is you interpreting and understanding the requirements of 132.16 better than your peers I would say.

Yes that is what he is like too. He admits if he doesn't know anything and I think he enjoys hearing from those who are on the tools as he hasn't for the last 20 years (although I'd say he is only mid 40's)

I think he was generally just intrigued that I was saying I'd test Ze and the others said they wouldn't. Although I'm pretty sure he said he wouldn't (which I guess is concerning)
 
Yes that is what he is like too. He admits if he doesn't know anything and I think he enjoys hearing from those who are on the tools as he hasn't for the last 20 years (although I'd say he is only mid 40's)

I think he was generally just intrigued that I was saying I'd test Ze and the others said they wouldn't. Although I'm pretty sure he said he wouldn't (which I guess is concerning)

As a retort to support your position I would read through the wording of 132.16.
To me "ascertain" in that reg would involve both inspection and testing of relevant equipment to ensure compliance.
 
I think you were correct. Ignoring the regs and requirements,for a minute,the tests to check the supply characteristics,are not onerous or particularly time consuming.

They can,on occasion,flag up issues,and lead us in other directions,sometimes directly concerned with safety,which is a primary reason for most of our governance.

I would hazard a guess,that the others on your course,giving you a hard time,were probably older,maybe considering themselves to have so much more experience,these tasks were unnecessary. They are wrong.

We can all shoe,a dead horse. It is probably easier.
But sooner or later,when we stick our hand out for payment,someone is going to ask if we checked...
 
Had almost this situation in real life. Went to do an addition. Checked EFLI before starting and they’d lost their earth due to corrosion of conductors on the pole outside. DNO came straight out and fixed it.
 
Earth fault loop impedance revision of ENA Engineering Recommendation P23 - https://electrical.------.org/wiring-matters/issues/72/earth-fault-loop-impedance-revision-of-ena-engineering-recommendation-p23/ This is an interesting read for max Ze values probably one of the few places you will find it recorded, Engineers Recommendation P23/2:2018.
 
Well done firstly

How and in what way was it difficult?

Understanding what the question is truly asking if the biggest challenge. Once you break the questions down it's usually simple but the questions are really tricky.

For example I had one that said something along the lines of "a 30ma RCD was tested at 150ma and found to trip at 500ma. What would this indicate"

Possible answers were,

A. The rcd provides efficient fault current protection

B. The rcd will be subject to noisance tripping

C. The rcd test button has been regularly checked

D. (Something along the lines of) the rcd is working perfectly.

It had me guessing because it's not obvious.

Some of the questions were difficult to find or work out. For example, if a earth electrode has a resistance of 27ohms, what would be the maximum rated rcd allowable on the installation....

Just a few examples. I can remember quitr a few but I'd be here all night.
 

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