Are these suitable for domestic installations ? I keep having nuisance tripping and have had several people come test sockets/appliances with nothing found each time.
I am using a 63A (german made) RCD which was dripping all the time especially when rain comes (when humidity increases). After some days I could reset it without doing anything, It was going on like that, but finally I found that the trouble was from a switch near the toilet.
I've installed one on our main feed in our holiday home in Italy, which was getting nuisance trips everytime a lightning storm passes over. Works fine.
So many oversights on this video. 1 - No Lock off , 2 No supply voltage check with test lamps confirmed working with proving unit. 3 You disconnect main protective conductors to copper pipe work so has not to pick up false readings on R1 + R2 tests via parellel paths. 4 To get a correct R1 + R2 result on the ring main you divide the reading by 4. 5 When doing an R1+R2 test on lighting take a reading from all fittings + switches and record the highest !
Nothing like an instructor giving a demonstration with his back to you and you can't see what he is doing, maybe I could do a corce at his college and I could then a job and no one would be any the wiser weather or not I have done it properly
Don't forget the line conductor on the programmer between terminals 1 & 5. If you don't install it then the room stat won't work, it is shown on the diagram
Check the diagram for the DOL starter, they deliberately wired it L3-L2-L1 on the incoming side to the isolator and because the contactor is pre-wired, they swap it back to L1-L2-L3 between the bottom of the isolator to the top of the contactor
Good video. What is the preferred method for terminating SY cable in an enclosure? Should the 2 brass washers be inside the enclosure or external? The reason I ask is that clamping the braids inside an enclosure can be tricky. Also would you confirm that colour identification is not required on black SY conductors as per BS7671? Numbering is allowed instead of colour identification. Also are the legs of the RFC required to be labelled/identified? If yes would one label them? Are the main protective bonding conductors required to be labelled inside the DB? Is it OK to ask the accessor to carry out the phase rotation test at the isolator before putting the cover on to conduct the Zs test? This would save some time as I would have to remove it again adter completing the Zs tests. Thanks
Hi Dave, thanks for doing this. We're just at the point of researching what the art of the possible is for our training delivery and this has been very helpful.
Good video, good process. One (pedantic) possible improvement could be to reverse the test sequence, i.e. start with N-E an end with the Phase to Phase. We had an instrument blow up the resulted in serious injuries for the engineer. The otherwise undetectable fault in the meter would possible have failed with less fault current if it had blown on Phase to earth. Good to see you are testing for dead without testing on a 'known live source' though.
This video is a joke. Should've nulled his leads before he started, should've done a safe isolantion before doing anything. He is removing live and cpc conductors while MCB and main isolator is ON and LIVE. Didn't flick the light switch ON and OFF as he was doing his r1r2 at the light circuit. Used a bloody painters ladder. Didn't null the crock clips before doing end to end on ring. IR at 500V he tested between the Live and the entire Netral bar instead of removing the Neutral from the circuit in question, while still having a bulk head with a light still on above the dis board. Don't do what this guy is doing under exam condition. You're bound to fail.
Can you confirm the switching of the light switch(s) is required for safe isolation or was that for insulation resistance testing? I take it learners have to do both single a 3 phase isolation procedures and are you suggesting they make learners do the lighting circuit as the 230v circuit to be isolated? Thanks Gaz
It's required for both. I was referring to when performing safe isolation, it's important we test both sides of the circuit to ensure it's just not switched off. Similarly with insulation resistance we have to test both side to ensure we have tested all cables in that install. They have to do 3 phase safe isolation in part A, then before live testing they have to perform 230v safe isolation on a lighting circuit and DOL. Great question Gaz. Does that help?
Hi mate great video but could you please do one more in depth, demonstrating how youre setting up your megger for each test and explain the purpose of each test phase of cripper. Thanks again.
Would be great if you'd show the actual meter settings and the readings you get. What you appear to be doing here is just enacting the CRIPPER testing sequence without actually showing much. Sorry if I sound negative, but thanks for the vid. ;)
1st test is. continuity of protective conductor (disconnect cpc from met) 2nd test is. continuity of main and supplementary bonding conductors (disconnect cpc from met) 3rd test is. continuity of final rind circuits (no need to disconnect the cpc from the met)
Point 2) is wrong testing supplementary bonding , the conductors remain connected at the MET or earth bar .also he should of used a crock clip on one of the test leads and clipped onto the earth conductor to insure a good connection and a good reading