Continuity of CPC and Polarity of a 1 Way and a 2 Way and Intermediate Lighting Circuit (R1 + R2)
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- Опубліковано 5 сер 2024
- Students training aid for how to test for continuity of the CPC and polarity of a 1 way and a 2 way and intermediate lighting circuit. Full demonstration using a MFT Megger tester set on the ohms scale. We also demonstrate how to prove polarity by operating the switches and we also record the highest continuity reading in ohms as R1 + R2 in our testing paperwork.
🕕 Time Stamps - Cut to the action 🕕
00:00 - Continuity of the CPC and polarity test
00:40 - Result recorded as R1 + R2
01:04 - Setting up our Megger MFT tester
02:14 - Adding the link inside the consumer unit
03:40 - Testing at the one way switch
04:43 - Testing at our metal light fitting
06:57 - Operate the switch
08:45 - Testing at our second lighting point
09:11 - Operate the two way and intermediate switches
10:18 - Test at the two way and intermediate switches
10:55 - Learning summary
Videos are training aids for City and Guilds (C and G) and EAL courses Level 1, 2, 3 plus AM2, AM2S and AM2E.
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Got much better understanding of testing CPC continuity, thank you 😅
Thanks 👍🏻
The Gaz-n-Joe Q&A style is a winner !! I used to have to pause your videos to get my head around concepts, but the Q & A style really works, and it sinks in first time 💡 . As always, BIG thanks
Your very welcome 👍 Gaz
Another well put together training aid from the guys at GSH Electrical. Thanks 👍
Thanks for another great teaching video. Bring on Insulation Resistance!!
Amazing Gaz and his Pal 👍
nice vidio your proabley fed up people telling you both how helpfull / informitive and extremley brilliant you are....i would just like to say thankyou and keep on going.
Massive thanks for the kind words and taking the time to message 🦾 Gaz
Great videos
Thanks
Great tips for inspection and testing!
Brilliant stuff!👍
Nice job
Perfect Duo❤
Thanks 👍🏻
Amazing Gaz and his pal
This video is very useful.
Great video guys thanks.👍
Thanks for the support 👍
thanks for the explanation
great video guys thanks.
Thanks for the positive feedback
well done guys is there a J Robinson fan club
ua-cam.com/channels/kTkG9PHEycUd-Ps4oPW-vw.html
😁👍
Good vid
Well explained. Cheers for your continued effort gents. As a result; does the switching line has to be higher than the permanent live no matter what?
Links
I am slightly confused and not for the first time! why would you have to disconnect the cpc when conduit is being used for earthing purposes? I thought that the conduit would be directly connected to the metal casing which in turn would create an equipotential situation.
Hi. Steel conduit creates a parallel earth path and testing needs to prove the cpc (conductor) is continuous. ua-cam.com/video/r94dJ7ASRTY/v-deo.html
Thanks GSH
⭐️
Could you connect your link lead to the buzz bar with the breakers on other circuits switched off to save removing the conductors or would the breaker skew the reading?
in the am2s are you required to test r1+r2 from each lighting point and switch line? thanks
Yep 100%
@@GSHElectrical thank you
Whilst nulling the leads; what does it mean if the display on a Megger MFT is showing 0.00 and it is ‘flashing’? I think it means it is registering a MINUS value. Simply null again.
So you test between CPC-COM at both of the two ways and is this the same depending on the different ways of wiring two ways?
I was thinking what's the difference between a prospective fault current test ( ipf ) and a R1 + R2 test. not much by the look of it just that your testing a circuit with an R1 + R2 test and an ipf test is done at the DC with line and earth. - i just needed to say this
Hi great video! If the reading from the exposed conductive part was higher than from at the terminal would you record this result? Or do only direct readings from the cpc count for R1 +R2? Cheers!
The highest reading Alex 👍🏻
r1+r2 test results so what is maximum value acceptance of continuity of protective conductors?
In a real life situation where there "may" be hidden earthed metal conduit - there is a possibility that the electrician carrying out the testing would never know about this - so would it not be best practice to remove the CPC from the common earth bar in the CU and then clip onto the individual CPC to carry out the testing. This would guarantee that there is no interference from any parallel earthing route to skew the results.
Hi. Totally agree 👍 thanks for taking the time comment Gaz
Is this an acceptable method to use in the AM2?
Yep 👍. But always talk to your assessor. Gaz
Cheers gaz!
Does it matter where in the intermediate switch you carry out the test?
AM2 or AM2s Insulation Resistance Testing of 2 Way and Intermediate Switching Using Guidance Notes 3 ua-cam.com/video/9AjyWl_2bds/v-deo.html
The above link should also be helpful 👍. Thanks Gaz
Does the CPC always connect to Earth then? Sorry I just want to be sure I'm right before I memorise it for good. Thanks for these videos :)
The CPC is connected to the earth bar in a consumer unit which is connected to the earthing conductor.... which is connected to the greater mass of Earth. Thanks for commenting and watching. Gaz 👍
Is the link wire rated for 230 volts or is it not important here
Remember it’s a dead test Michael 👍🏻
Sir cpc full form?
9:14 well fed
Both guidance notes 3 & 643.1 of the regs say that you should compare your data to the relevant criteria. You have not even mentioned that, so you only get half the marks in any exam questions about this test method in my class.
SMH.