Continuity of CPC (R1 + R2) and Polarity of our 2 Way Lighting Circuit and Insulation Resistance

Students training aid for testing continuity of the CPC and polarity of a 2 way lighting circuit. Full demonstration using a MFT Megger tester set on the ohms scale.

Demonstration shows how to set up your Megger MFT tester and carry out an insulation resistance test for a 2 way lighting circuit. Test voltage is 500V DC and the minimum acceptable value according to BS 7671 1 megaohms with further investigation when the reading falls below 2 megohms. Also shows and explains the need to switch both 2 way switches into the other on position and repeat the insulation resistance test.

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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[danielsmith]

Absolute legend - Some trainers enjoy complicating this process, you make it as simple as it should be. Thank you.

[ChernoBueno]

Always clear your channel has taught me loads

[dawber]

Your videos are really helping me with my 2391 prep. thankyou!

[kakhead]

Ive been at college 9 weeks doing evenings. weve lost 3 tutors so far with the help of your vieos i will pass thank you

[afshin]

Thanks Gaz, it looks you didn’t take the lamp off while doing the insulation resistance test, would it be ok?

[Minkywhispers]

Another cracking video Gaz. These are gold dust! Thank you!

[georgedumitrescu]

Brilliant training videoclip. Just as it should be in any respectable training session. Well done.

[andywoods]

Hi Gaz, in an installation wired in the loop in method with say the lives wired to the switches. If the end of line neutral and earth is in a different room than the end of line switch feed. Do you have to run a wander led between the two to obtain the highest possible r1 r2 reading. Or does the max resistance reading from a switch line to only the lights its controlling suffice? Thanks

[alfiemason]

Would this testing be the same for two phase two way ? Because this is three phase ?

[ammarbasrah]

It is possible to show the method of examination by drawing

[willmeadows]

thanks for making this video it really helped me understand it

[CptSmegpot]

Hey, When you get the first reading for continuity, are both switches in the on position? Cheers

[piotrf]

What about 0.38 reading, that is the highest reading, is that going in cert?

[michaelcostello]

is there a max value for R1+Rn ?? why do we just look at Zs for earth fault. Surely a live to neutral fault must also trip the circuit breaker fast ??

[charliehenry]

How do you test a two way lighting circuit briefly