Ring final circuit test
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- Опубліковано 18 жов 2011
- www.routledge.com/u/electrical...
This test is further explained in Chris Kitcher's 'Practical Guide to Inspection, Testing and Certification of Electrical Installations', p43-52.
For more electrical installation books visit:
www.routledge.com/u/electrical/
Out of all the video bloggs I have watched this guy and his video team are the best. Sound is good and the geezer is clear.
love this clip. I didnt need it as you tought me for 2 years but its good to see you have moved with the times and brought your knowledge to the web. Congratulations with the books as well I remember you were writing the testing one in my last year. Adam
Another excellent video. I now use this in my class to further enhance understanding, thank you.
I'm a Level 2 student so let's discuss :P
Continuity of CPC verifies that the earth wire is connected securely so that fault current can flow to earth rather than through you under fault condition.
I think polarity is only confirmed when switching the furthest load on during the continuity test as THAT would be proof that the circuit is continuous all the way around and back to the CCU.
The other continuity tests are end to end (L1-L2 and N1-N2), L1--E2, L2--E1, L1--N2, L2--N1.
@Leigh Winspear,If your a student doing 2330 L2/L3 2357ect. the concept and theory behind the Ring final test is well covered, the purpose of Chris's videos are to show safe practical application of the required tests not a two hour mind melt :D
Hi Adam, really nice to hear from you mate hope you well.
Regards
Chris
testing between line and earth with fig 8 loop at db is a required test to confirm polarity at socket outlets
Exellent chriss ,,thanku
Hi, we don't use ring circuits for lighting in the uk, all ciruits are radial with the exception of 13A ring final circuits used for power . A standard domestic lighting circuit would be 6A with around 10 outlets as a rule of thumb
Just the video I needed. Thanks.
If you put the live conductor into the earth bar (separate screw terminal though), that will give you continuity and then polarity if you switch on the furthest load to prove it's correctly connected right the way through...
Yes video a great help, final level 3 exams on Thursday and Friday so has helped a great deal...
Yes it does do polarity also and I'm sure it would also cover continuity of CPC as it is basically the same test, only incorporating the whole ring as apposed to just the CPC alone.
I am not qualified just yet though so anyone feel free to correct me if i am wrong!
What he has basically done is the continuity if a Ring main circuit End to end is the quick way but anyone in college doing electrics will tell you that you need to do the so called figure of 8 test which he doe's where the phase (live) off one 2.5mm cable goe's into the neutral of the other 2.5mm cable and visa versa hence figure of 8 the results should only be read from the furthest away socket hence highest resistence reading then divide by 4 to get the resitance reading.
really good video
Hi, thanks for the vid. Really helping me prepare for my practical exam as a Level 2 electrical installations student.
However, I have to point something out about the testing probes you used for that three-phase 415V system; when you went to 'prove' it was dead and the lights hadn't failed during testing, the 415V light did not turn on when you inserted the probes in the proving unit. Check about 1:40 into the video.
Shouldn't that set of probes be replaced?
ok 3 phase 400V is the line voltage between any of the lines ie (L1 and L2 or L2 and L3) the 230V is between any of the Lines and the neutral which is like you home only 1 line comes in with the neutral and earth. Each of the 3 single Lines are 230V dont get confused people Line and phase are different. Line is the permanent supply phase is not. Phase is the live off each circuit created.
3:40
on your safe isolation test you only checked between earth and line 1 you should have tested all 3 phases surely?Could have a faulty main switch or circuits from another board could have gotten mixed up back feeding into your board
NOTE - Make sure you identify the L and N conductors as 1 and 2 BEFORE termination to save time on testing ;)
But in the proving unit, regardless of the reading on the three-phase board, all four lights should still light up to prove the instrument didn't fail. What if in the future there was a 400V delta connection he was testing? That would be a dangerous miscalculation.
Thanks for the first response though, I'm trying to learn through inquisition ;)