How to Find Incorrect Supply Polarity Testing and Fault Finding Live Testing Single Phase 230 Volts

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Күн бұрын

How to find incorrect supply polarity with an approved voltage indicator. The first live test in BS 7671 is recheck supply polarity it is so important and in this video Marcus demonstrates how to prove supply polarity of a single phase 230 volt AC supply in a domestic dwelling. Using a proving unit and a voltage indicator we show step by step how to carry out proving polarity of the supply test.
🔵 First Live Test AM2 & AM2S - Check Polarity of 3 Phase Supply, Using an Approved Voltage Indicator • First Live Test - Chec...
== 🕐 Time Stamps - Cut to the action 🕕 ==
00:00 - Fault finding on the supply cable
00:18 - First live test re-check polarity of supply
00:37 - Issues at the socket?
01:22 - Supply is isolated
01:57 - Visual inspection
03:07 - Check your approved voltage indicator
03:36 - Starting the test L/E N/E L/N
05:16 - Recheck your approved voltage indicator
05:26 - Summary
Videos are training aids for City and Guilds (C and G) and EAL courses Level 1, 2, 3 plus AM2, AM2S and AM2E.
You can follow me day by day on Facebook, Instagram and Twitter lookout for "GSH Electrical.
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Пікірлер: 43

@elektrikeren5049 4 жыл бұрын

Even as an Old spark/electrical engineer (42 years Old 🙈) I still watch these videos. With love from Denmark.🇩🇰

@GSHElectrical 4 жыл бұрын

Thanks for the support. Gaz 👍

@Kebabicide 4 жыл бұрын

Don't say old, I'm just starting out and I am 48!!!🤪

@noskills9577 4 жыл бұрын

How many of us fail to do this on a new install until we notice the problem at a socket..... good reminder

@ek6868 4 жыл бұрын

Tanx for the upload always look forward to your fault finding videos👍

@richardwash6678 4 жыл бұрын

Nice one Gaz and Marcus 👍

@GSHElectrical 4 жыл бұрын

Thanks 👍🕺

@triplerjm2353 3 жыл бұрын

👍🏿👍🏿👍🏿👍🏿another stunning video thank you guys 👏🏿👏🏿👏🏿👏🏿👏🏿, spent 5 hrs yesterday solving a polarity issue but couldn't tried everything that I know in other to correct it but was unable to, last night I thought going some GSH tutorial video here we go I have just watch what was missing on my head, going back to the job in 2hrs with confidence and will keep you posted with my result. 👏🏿👏🏿👏🏿👏🏿👏🏿👏🏿👏🏿

@GSHElectrical 3 жыл бұрын

Thanks for the fantastic comment and glad my videos are helpful 🦾

@jamesm.9285 4 жыл бұрын

Soon to start my fault finding module - great timing! :) Thanks.

@benjibiker6053 4 жыл бұрын

Great Video! Keep them coming :)

@campo2309 3 жыл бұрын

It's definitely been so helpful. Cheers!

@michaelcostello6991 2 жыл бұрын

I would like a video showing a sketch of all possible issues with reverse polarity including the safety check issues you mention

@train4905 4 жыл бұрын

Superb video guys as always.well done.keep up the great work and videos.

@GSHElectrical 4 жыл бұрын

Stephen Allen thanks for the support. Gaz 👍

@andrewyeo2353 4 жыл бұрын

Yes thanks the video had been some help. Important point doing line and earth first instead of the safe isolation protocol of line neutral when dealing with polarity

@ianfraser2009 4 жыл бұрын

I have had problems with electrician with this subject before doing commercial installations. There answer back to me is there in no problem with live and neutral being mixed up everything will work fine, It just reversed. Good video

@cosme3345 4 жыл бұрын

Saludos de madrid España

@garethl665 4 жыл бұрын

Awesome video

@GSHElectrical 4 жыл бұрын

Gareth L thanks

@mskaroly6356 4 жыл бұрын

Boss, if the polarity was wrong from the suppliers side, how could they bond the neutral (actually live) and earth together at the main incoming side, assuming you are following TNCS system?

@Dog-whisperer7494 Жыл бұрын

Great video, guy’s clear and precise explanation. 👍👍👍👍❤️ One question though, if you did all the required dead test in the correct order then the supply polarity test would show this fault at the CU as we test between line and neutral and line and earth and neutral and earth.

@ahmedelectricianofiraq5550 4 жыл бұрын

It's amportaing to check a polarity of line and neutral in all installation in house becuse that what make light bulb have weak glow even the switch off .

@mistermartin82 4 жыл бұрын

If this was a TN-C-S this would mean all exposed metalwork would be live too (through bonding). Presumably when you check polarity upstream you are only doing so where the connections aren't sealed by DNO ?

@simonaragon1992 4 жыл бұрын

Good videos, and respect for the effort you put in to delivering them. Do your students get much on control circuits and motor starters etc? Lots of it seems aimed at domestic, what if students end up working in more industrial settings where this sort of stuff is vital to have knowledge of. :)

@GSHElectrical 4 жыл бұрын

We are working a videos for these areas in February half term🤞. Thanks for the message. Gaz 👍

@simonaragon1992 4 жыл бұрын

@@GSHElectrical Great stuff. Look forward to watching. :)

@alexanderroland7197 4 жыл бұрын

GSH Electrical

@MrSeananners12345 Жыл бұрын

Could you do the MET instead of the earth bar ?

@Kebabicide 4 жыл бұрын

Is it necessary to prove your unit? I was led to believe it wasn't important when live testing, as you're always going to have a supply to energise your tester, if it's battery is flat.

@WILL-fu6jk 2 жыл бұрын

As the two wires, live and neutral had reversed polarity i assumed that some where along the circuit the wires had met an appliance or an object and weren’t wired properly ? Is this correct ? If so where along the circuit where the wires not fitted correctly?

@davidmarsden8868 4 жыл бұрын

If found to be the DNOs fault can you leave the power turned on till the reverse polarity is fixed.

@dexwhitmore 4 жыл бұрын

Gaz, do you have schematics for your fixed testing boards (1, 2, 3 etc)? I'd love to make something like it for our college workshop as currently we don't have anything fixed and dedicated for the purpose. Failing a schematic, a photo with sections indicated (ring, radial, lighting etc. It looks beautiful

@GSHElectrical 4 жыл бұрын

Direct message me on either Facebook, Twitter or Instagram look for GSH Electrical

@dexwhitmore 4 жыл бұрын

GSH Electrical dropped a message via Facebook messenger. Your twitter isn't set to accepts DMs, if you're not aware 👍

@markd5266 4 жыл бұрын

Fault finding video's 😍 If I've understood this correctly, you have reversed polarity, so the neutral is now the line and doesn't have protection from a rcd etc. So if you have a faulty appliance with a dead short circuit between line and neutral and have reversed polarity to the consumer unit, none of the safety protection circuit's would work. And the faulty appliance would just draw more current until the wires melt etc or something goes bang?

@JasperJanssen 2 жыл бұрын

RCDs still work, they look for imbalance between the two conductors and don’t really make a difference which is which. Technically, and practically, it is often possible to wire RCDs up in either LN or NL fashion depending on whether you need the live to come out the left side or the right. (Check your manufacturer’s instructions for whether they are tested that way, obvs, don’t take the word of a rando non-spark on the jnternet). It’s the overcurrent “fuses” that no longer work - so both the “slightly higher current than specified” and “dead short circuit” functions of MCBs do not trigger, unless the current goes back through the live conductor. So for fully rcd+MCB (or RCBO) protected circuits, those should still trigger on any of the 3 types of faults (albeit in a back-ass-wards way), but for MCB only circuits that are not RCD protected this would give you a situation where you could short out kilo-amps from “neutral” (actually line) to earth and not trigger any protection. Even the DNO main fuse won’t trigger, because that’s in the “line” conductor as well and that’s not part of this circuit! So the only protective device remaining is most likely going to be the transformer substation fusing, given that that will probably be before where the switch was made. So what is that, several kilo-amps? That’s a hell of a fire starter, twisted firestarter… I suppose that’s one reason RCDs are neat.

@martorelkeyita3581 3 жыл бұрын

As alternative current changes the direction so it not gonna be a problem once neutral and live and earth have been reverse because everything will work normally without any short circuit

@Chris-rs6nq 4 жыл бұрын

I'm currently finishing my level 3 and have my 18th edition but i am struggling to find any company willing to take me on (normally don't even get any reply's) so i can get any form of on-site training. Does anyone have any advice to get into the industry.

@GSHElectrical 4 жыл бұрын

Hi Chris, this may help kzfaq.info/get/bejne/b66AfNaYz7CRfXU.html Thanks for commenting and if you want a chat DM me on either Facebook or Instagram. All the best Gaz 👍

@Masteranddisaster13 4 жыл бұрын

Chris danson call some agencies You might be able to get a job as an improver or mate.