Not sure if you guys will see this but just wanted to say a massive thank you, passed my AM2 first time and your videos absolutely carried me through, thank you!!!
@GSHElectrical2 жыл бұрын
Fantastic news 👍🏻 congratulations from team GSH
@skabbymuff1112 жыл бұрын
Yes, thanks guys, about to undertake this myself and your videos are invaluable 👊
@MotherRussiaisforever Жыл бұрын
@@GSHElectrical He should have done Zs at DB as well...
@pvegod14846 ай бұрын
@@MotherRussiaisforever isnt that only relevant if this is a sub main ?
@callumsimpson74832 жыл бұрын
My level 3 teacher is currently drilling me with three phase testing and fault finding as Iv handed my design project in well early. I’m so glad because once you start doing the three phase it’s so much different. I can honestly say I feel confident to do my 2391 and am2 and watching these videos now make a lot more sense than when I watched it without doing three phase.
@GSHElectrical2 жыл бұрын
All the best and thanks for commenting 👍🏻
@GSHElectrical3 жыл бұрын
== 🕐 Time Stamps - Cut to the action 🕕 == 00:00 - Ze and PFC tests 00:54 - Isolating the 3 phase distribution board 01:58 - Disconnecting the earthing conductor to remove parallel earth paths created by the bonding 02:55 - External earth fault loop impedance test Ze test on a 3 phase dis-board 05:11 - Reconnect the earthing conductor 05:19 - Prospective earth fault current PEFC test (PFC) 06:34 - Prospective short circuit current PSCC test (PFC) 08:00 - Rule of thumb double your highest reading from PSCC test for a 3 phase supply 09:48 - Testing PSCC between the 3 line conductors of a 3 phase supply
@jonathanrose4562 жыл бұрын
Great video! Lots of real world training missing online. H&S… I wear VDE gloves when working/testing live. Just mitigates the risk. Easy enough to fall forward on to the live terminals, especially so on older 3ph boards & working off a ladder, etc..
@marcusleung75154 ай бұрын
the best demostration i found on YT so far , Cheers
@GSHElectrical4 ай бұрын
Massive thanks to
@EricTheHiking3 жыл бұрын
Thank you guys for all test. Some of them I wasn't sure 👍👍👍
@GSHElectrical3 жыл бұрын
Thanks for the support and watching
@JohnCanty933 жыл бұрын
Thanks guys make it so much easier to understand seeing it 👍🏼
@AdamTheAd-vanc3dАй бұрын
100% agree.
@AdamTheAd-vanc3dАй бұрын
100% agree.
@peterjesus8162 жыл бұрын
It was more than helpful, God bless u
@GSHElectrical2 жыл бұрын
Thanks 👍🏻
@Big-T-2 жыл бұрын
Thanks very much, been looking for a good ze, pfc vid in a 3p DB. Getting ready for my fica at the end of this year👍🏾.
@GSHElectrical2 жыл бұрын
Thanks
@Bari_Khan_CEng_CMarEng11 ай бұрын
Another great video and demonstration, much appreciated
@GSHElectrical11 ай бұрын
Thanks 👍🏻
@jonerasmus9399 Жыл бұрын
Plz do many more videos. Great job chaps
@GSHElectrical Жыл бұрын
Thanks! Will do!👍🏻
@Mok-l5i2 жыл бұрын
Thanks ,you make it easy to understand
@GSHElectrical2 жыл бұрын
Thanks for commenting and watching 👍🏻
@kilowatt79605 ай бұрын
Excellent Video! Very well explained. I have just one question please to clear my mind. In theory, line to line fault is 3phase fault multiply by 0.866, therefore can I just use the fault current measured in L-L (4.11 kA) divided by 0.866 to get the 3phase fault instead of doubling the max fault measured in L-N?
@dominicboyle86522 жыл бұрын
Great Video Guys, very well explained
@ollieb73942 жыл бұрын
Great video guys! Not sure how strict and to the book the assessors will be in the am2 but GN3 does recommend dividing the line to line value by 0.87 if measuring Ipf between phases. Edit: After some research online I believe this figure is a guide to working out a simultaneous fault between all phase conductors with a fault of negligible impedance.
@GSHElectrical2 жыл бұрын
Great feedback 👍🏻
@dimitrisblane6368 Жыл бұрын
Thank you so much for these videos. Really helpful information! One question. Why we take the PFC measurement with the main switch off and on the source side? When using the system all breakers etc are on. Why take the rest of the system out of the equation? the PFC surely would be different when the whole system is connected and turned on? Thank you
@redroutemaster7 ай бұрын
Good video, informative. After 29 years of data cabling/engineering a flooded market of poor quality engineers the last few years reducing rates I started an electrical training course a month ago and enjoying it (should of started years back). Would the incomer earth be better with a ring crimped connector?
@shiamjad2 жыл бұрын
Thank you for the explanation
@GSHElectrical2 жыл бұрын
Thanks for watching 👍🏻
@krazylad842 жыл бұрын
massive thanks !
@GSHElectrical2 жыл бұрын
👍🏻
@willd41022 жыл бұрын
I didn’t double the figure and I failed on the PFC test so I had to resit the full inspection and testing segment
@GSHElectrical2 жыл бұрын
Thanks for your feedback 👍🏻
@dooz1002 жыл бұрын
Great video, possible to do video on 3 phase rcd 300mA
@krishtheobald42272 жыл бұрын
I do believe the highest L-L reading has to be divided by 0.87 to get a simultaneous 3 phase fault PSCC. Someone else also mentioned this. Was there a reason you didn’t mention it in this video?
@EdwardBretherton8 ай бұрын
great video , big thumbs up and i want that red car , where is this filmed
@GSHElectrical8 ай бұрын
Thanks for the support 👍🏻
@detroutspinners9933 Жыл бұрын
I’m assuming as it’s a live test you’d need the tails to have voltage to actually get a reading on the Ze and PFC tests? For example on the AM2 rig if they’ve isolated it remotely, I’d need to lock off the main switch on the board, then energise the isolator?
@rowles132 жыл бұрын
Brilliant guys
@GSHElectrical2 жыл бұрын
Thanks
@naqshAli7862 күн бұрын
Hi, would I have to carry out the PSCC between phases on a 3ph db. Or just each phase to neutral and double it?
@Dibbo19793 жыл бұрын
Great video, once again. Could you tell me how too test a 3phase rcbo please?
@earthrelated Жыл бұрын
Thank you!
@kingofthetrowel17252 жыл бұрын
Sorry if this is silly question as I’m still a beginner adult learner etc but why do we have to use a,,3lead high or 3lead low? what’s difference and why do it etc 👍👍
@johnwaby43212 жыл бұрын
Brilliant
@OllyDunne242 жыл бұрын
Hi thanks for this I didn’t realise you have to double the PFC, is this just on a three faze board?
@GSHElectrical2 жыл бұрын
Yes 👍🏻
@OllyDunne242 жыл бұрын
@@GSHElectrical thank you! is the PFC is the only one you write down on the schedule of tests?
@callumsimpson74832 жыл бұрын
@@OllyDunne24 you write down the highest reading you get out the two I believe
@jackninnu9719 Жыл бұрын
2 kings ❤
@bernardcharlesworth98602 жыл бұрын
Thanks
@michaelcostello69912 жыл бұрын
Does that earth wire go back to supply transformer or is it just linked to the neutral at the cut out. Is 3 phase the same as single phase domestic in this regard. Thanks
@TheMattSturgeon2 жыл бұрын
On a TN-S the earth goes all the way to the transformer separately from the neutral,. They're then connected together at the transformer. On a TN-C-S (shown in the video) the earth and neutral are joined at the cutout, and continue as a "PEN" conductor to the transformer (protective earth/neutral). On a TT the earth doesn't go to the transformer at all. Instead it connects to the consumer's earth electrode.
@giubaca6 ай бұрын
Theoretically the value is x1.73. However is much easier to double it
@GSHElectrical6 ай бұрын
👍🏻
@SantoshYadav-k8g7 ай бұрын
Ma'am bahut accha padte hai m
@munyentwarithomas18845 ай бұрын
Show how to measure insulation and RCD.
@adambrammeld9286 Жыл бұрын
Don’t you have to actually times by square root of three and not double it For three phase PFC? It’s not double to work out single to three phase?
@louisdibra21369 ай бұрын
Should the right hand side dial be set on zmax when doing pscc 2lead high?
@17italyman2 жыл бұрын
for the am2s would we need to test between line conductors for PSCC or is testing between line and earth and line and neutral and doubling it enough ? Also would the reading from line and earth ever be higher than line to neutral ?
@adambrammeld9286 Жыл бұрын
Should be times by square root of three I thought becuase of the different between Line and Phases?
@dawber1994 Жыл бұрын
do you have to test between L1-L2 and so on or can you just do the L’s -N and double it?
@GSHElectrical Жыл бұрын
If your tester can test between line conductors you take that as the heights reading if not it’s line neutral and double it 👍🏻
@reomangham20224 ай бұрын
l not have 2 phase l good vid Brilliant
@JoeMorsie2 жыл бұрын
In guidance note 3 the PEFC shows a 3 lead test. does it matter if you do a 2 or 3 lead test? i have my AM2 in 2 weeks. Thanks
@BenHardie-dm1ix8 ай бұрын
I’ve always done a 3 lead test, seeing this has thrown me and I have my AM2S in a week and a half. How did yours go?
@thetruth66932 жыл бұрын
Would you double it on a domestic install as well?
@GSHElectrical2 жыл бұрын
Only on 3 phase installation 👍🏻
@dezire84702 жыл бұрын
Only on 3 phase Because of the potential between 2 different phases
@dawber1994 Жыл бұрын
Hi, why do you bother testing the PEFC on 3 phase if it doesn’t get recorded?
@GSHElectrical Жыл бұрын
Great point 👍🏻
@harrygroves1723 жыл бұрын
What about if there is an rcd when taking the pscc, is there a way to test this on a 3 low setting?
@salamsaloom247711 ай бұрын
👍👍👍👍👍👍
@Death887588 ай бұрын
Just failed my 2391 because i got lost at the PEFC testing. Isnt there a 3 lead test with this megger or thats just for single phase
@pvegod14846 ай бұрын
pfc requires a 2 lead test
@MuratAydogdu982 жыл бұрын
Would you fail if you measure PSCC on the load side of the main switch?
@pvegod14846 ай бұрын
if its locked off you cant
@johndeer4545 Жыл бұрын
great video guys, and surprised me how fluentJean Reno in english
@jamieseymour8437 Жыл бұрын
On the am2 you don’t test for the zs you calculate it, this can fail you
@GSHElectrical Жыл бұрын
This test is external impedance Ze 👍🏻.
@clemfandango87772 жыл бұрын
Why double why not tripple...surely if the armoured was destroyed and 3 phase was shorted with the netural it would be higher than doubled?
@tezbtezb2 жыл бұрын
If I'm right you can only sort between 2 lines so line voltage is 400V giving highest fault current possible. E.g 400V ÷ 0.10ohm =4000A
@travoltasbiplane15512 жыл бұрын
I can hear you Clem. Technically if you measure line to line you should then divide by 0.87 to account for the bolted fault shorting all lines at the same time that you describe! Doubling the line neutral pscc accounts for this already. Hope that helps. 👍
@keirstitt82772 жыл бұрын
Even if you had a three way fault - which is a two fault situation so we don't usually consider these. But the three phases are like the corners of an equaliateral triangle - so each is 400V from each other. When you short all three you'd get approximately the same fault current on each line conductor as the additional current would be balanced across three instead of two conductors.
@travoltasbiplane15512 жыл бұрын
@@keirstitt8277 not according to the iet you wouldn't... It's in GN3 👍
@keirstitt82772 жыл бұрын
@@travoltasbiplane1551 you must have a different GN3 because it doesn't say any such thing in there. Appendix 14 of BS7671 maybe.
@InTheGrooove Жыл бұрын
What is AM2 ?
@GSHElectrical Жыл бұрын
An end point assessment for apprentice electricians 👍🏻