Live Incomer Tests at a 3 phase DB - AM2, AM2s, AM2e, 2391 Inspection and Testing Course

This video explains in detail, the requirements for carrying out live electrical testing at the incoming supply of a 3 phase distribution board. This is very useful for apprentice electricians about to take AM2, AM2s, AM2e end point assessments. Also for career CPD for electricians, and for electricians undertaking C&G 2391 Inspection & Testing Course.

[@philbayman9964]

Another awesome video. Love them. Thank you!

[@sports872]

Enjoyed the video. Would like to see more testing videos if possible.

[@headsup4sparkies]

More to come!

[@lewiswebb1843]

Thanks mate, got my am2s this Monday and this is spot on 👍🏻

[@pvegod1484]

Did you pass it mate? I’ve got mine in a couple week bricking it

[@lewiswebb1843]

Yea passed 1st time mate 👍🏻 I’ll be honest, if your here looking up videos to pass then you’ll probably be one of the guys that will pass either 1st time or on a return attempt 👍🏻 good luck 🤞🏻

[@detroutspinners9933]

Brilliant video, really appreciate the time taken to animate the test sequences as well. Helps to visualise what you’re doing so much better!

[@headsup4sparkies]

Thank you 🙏.., I’m glad you found this helpful 😀

[@user-cs9ch8ey9k]

Excellent video as always, thank you.

[@headsup4sparkies]

🙏 Thank you .. hope it has helped ..

[@monikacieminska5380]

Fantastic video. Thank you 👌😀

[@headsup4sparkies]

Glad you found this useful 😀

[@brianhewitt8618]

excellent 👍

[@headsup4sparkies]

Thank you! Cheers!

[@joeraby1370]

Hi very helpful video! I have my am2 coming up and just wanted to know at what stage do I carry out the phase rotation test at the main switch? The motor and commando are fine as they can be done with everything closed up and on but from what I've seen the test of the main supply seems to come after RCD and functional but by that stage you would have the board cover back on?

[@glenngray3351]

Hi I am having a few issues on identifying the types of wiring and reference method on the Generic schedule of circuit details. Can help or advise please?

[@headsup4sparkies]

This can be simple - or complex, depending on the variety of methods employed on the route. You can select the most used method on the route / the method with most detrimental effect .. or so on. The inspector should use engineering judgement to decide … this link to IET - Supporting BS7671 Appendix 4 .. might help electrical.theiet.org/media/1617/appendix-4-of-bs-7671.pdf

[@azadsmail8]

Hi nice vid but I noticed that the highest reading is PEFC 950.3 this one should be doubled and recorded not the PSCC am I right? THANKS

[@headsup4sparkies]

Hi … When testing between Line and Neutral (PSCC), the voltage potential is 230V .. we double this to allow for the PSCC between Line conductors as these would have a potential of 400V. The maximum potential to earth (PEFC) is 230 so therefore is not doubled. You only double the highest PSCC value.

[@Rossisearle]

helpful but surely that Zdb your say is Ze because the is the 3 phase dno supply? is zdb would be at 2nd or 3nd distribution circuit ? ASKING

[@headsup4sparkies]

Hi … If the board is at the origin of supply - then Zdb and Ze would be the same. Ze recorded on certificate and Zdb recorded on schedule of test results. If there is a sub main between the origin and the board under test .. then Zdb is measured at board with earth disconnected - and Ze from origin recorded on the certificate.

[@headsup4sparkies]

The distribution board at the origin supplying the sub main, would also record this supply’s Zs on on it’s own schedule of test results, taken in the same manner but with the earth connected.

[@headsup4sparkies]

The board in the video is assumed not to be at the origin of supply … Hope this helps 👍🏻

[@Rossisearle]

​@@headsup4sparkies right... So like a three phase distribution circuit?

[@headsup4sparkies]

Yes … we call them “Sub-Mains” when we distribute the supplies from DNO to distribution boards… and the circuits from there are “final sub-circuits” supplying current using equipment without further distribution.