Continuity of CPC and Polarity of a 1 Way and a 2 Way and Intermediate Lighting Circuit (R1 + R2)

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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[wallbouncer]

Another well put together training aid from the guys at GSH Electrical. Thanks 👍

[LindaTheLearner]

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

[no_short_circuit]

Thanks for another great teaching video. Bring on Insulation Resistance!!

[volodimirdembitskyy]

Got much better understanding of testing CPC continuity, thank you 😅

[timothyroper]

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.

[imranrashid]

Great tips for inspection and testing!

[linksone]

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

[drunkinpiper]

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.

[laviniaficioru]

well done guys is there a J Robinson fan club

[ArchieUX]

in the am2s are you required to test r1+r2 from each lighting point and switch line? thanks

[green]

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.

[PCH]

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

[shilks]

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.

[jaydenplaysguitar]

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?

[mikecolwill]

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?

[republicofjupiter]

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 :)

[moath]

r1+r2 test results so what is maximum value acceptance of continuity of protective conductors?

[alexwilliams]

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!

[rclipssss]

Is this an acceptable method to use in the AM2?

[lloydmorris]

Does it matter where in the intermediate switch you carry out the test?