Testing and Fault Finding - Low Insulation Resistance Fault - Testing at 250 and 500 Volts DC

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It isn't often that you can carryout the insulation resistance test will all circuit connected because of RCD protection in a consumer unit. In this video Marcus has no RCCB's or RCBO's in the consumer unit (fuse box) so he can test between all line conductor to the neutral bar, all line conductor the the earth bar and between all neutral and earth connections. Marcus shows how using 250 volts DC from his Megger MFT tester can prove all loads have been removed when testing between line and neutral (live conductors). After achieving a low insulation result between the neutral and earth bar Marcus show how to track down the circuit that has the fault.
🕕 Time Stamps - Cut to the action 🕕
00:00 - Low insulation resistance
00:41 - Setting up our Megger MFT tester
01:23 - 2M ohms
02:10 - Pre tests before changing the board
02:47 - Earthing conductor and bonding are connected
03:34 - Testing between the neutral bar and the earth bar
04:06 - Fault finding
04:48 - Removing circuit number one's neutral
05:40 - Old looking outside light
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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Опубликовано:

24 июл 2024

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Комментарии : 43

@mb-electricalservices 2 года назад

Love these "on site" videos as opposed to the staged videos. Brilliant. 👍

@mb-electricalservices 2 года назад

Are you guys going to do a follow up video to show where the fault was? Betting it will be the external lighting/joint box.

@GSHElectrical 2 года назад

It was the outside light 👍🏻

@GSHElectrical 2 года назад

I am a training channel so the classroom videos will always be my go to however I do have about 10 on-site videos ready for release 👍🏻

@Ibrahim-vt2tz Месяц назад

Thank you ❤❤❤❤❤

@curtisdeery9647 2 года назад

Great video guys

@GSHElectrical 2 года назад

Massive thanks 👍🏻

@markr452 2 года назад

I really enjoyed this

@GSHElectrical 2 года назад

Thanks

@Tryingtimes007 2 года назад

Yet another great “tutorial” simplistic and precise, I would take the knot out of the test lead tho, just to be pedantic 👍

@GSHElectrical 2 года назад

🤦🏻‍♂️

@muzikman2008 Год назад

It's a current limiting knot 🤭

@andrewyeo2353 2 года назад

Been too long since I've heard.... I hope this video has been some help, great work chaps

@GSHElectrical 2 года назад

Thanks Andrew for returning 👍🏻

@salamsaloom2477 Год назад

Very helpful informations

@GSHElectrical Год назад

Thanks 👍🏻

@ianellis9914 Год назад

Have you got a video on the 014 assessment would be great to see one on that

@kojak2169 2 года назад

In an instal that old would the incomers be live because I couldn't tell if there was an isolator. Or did the main fuse fall out of its own accord when you weren't looking.

@islandhopperstuart 2 года назад

Excellent video with Gaz in his best role as questioning tutor. Marcus is clearly first rate: presumably a former student?

@Skelton1996 Год назад

Do you have to disconnect the loads when you are only testing between the live conductors and cps?

@seandempsey7351 2 года назад

I have deleted my earlier comments as being a grumpy old spark who’s opinion means nothing. I feel I may off offended some people witch mean’s my research was pointless. Never mind the fact I was right. Fantastic video as always Gaz 👍👍👍❤️

@markr452 2 года назад

I'm hoping to do my 2391 this year

@wayneh150 Год назад

Did you take the lamp out the outside light before testing?

@GSHElectrical Год назад

It didn’t have one 👍🏻. All loads removed

@MizunoIronMan 2 года назад

New On-Site Guide (Amendment 2) now states that "where the insulation resistance measured is less than 20MΩ the possibility of a latent defect exists". This was in the previous GN3 but not the On-Site Guide.

@GSHElectrical 2 года назад

It’s said that for along time 👍🏻

@MizunoIronMan 2 года назад

@@GSHElectrical Old (Blue) On-Site Guide says 2MΩ (page 109), new (Brown) says 20MΩ (page119).

@seandempsey7351 2 года назад

@@MizunoIronMan it also say the an IR test at 250 v DC shall be carried out between line conductors and the protective conductor be for equipment is installed? This is to avoid damage to sensitive electronic equipment. This implies that we test line and neutral combined to earth earth, this is a test we have always done at 500vDC And as there is no pertenchal difference it’s highly unlikely that such a would damage any electronic equipment.

@seandempsey7351 2 года назад

@@MizunoIronMan what does BS7671 the big brown book say don’t just rely on the onsite guide.

@MizunoIronMan 2 года назад

@@seandempsey7351 I know what the correct values are thanks. I was just highlighting the fact that there was a frustrating inconsistency between the OSG and GN3 before the new Amendment 2. Maybe it’s the punctuation that threw you a bit .

@Oufg103f 7 месяцев назад

👍

@mre3820 2 года назад

The board looks so simple compared to the elaborate offerings nowadays K.I.S.S 😅

@stupot_64 2 года назад

Unfortunately having many circuits on a rewireable fuse causes issues when a fuse blows. Separating circuits on to separate RCBOs means that any fault on one circuit will have less of an impact for the customer. Also flipping a switch is a lot quicker than having to replace the blown fuse wire.

@seandempsey7351 2 года назад

Why did he have to change the CU? Don’t anyone bother with the onsite guide ie page 99 consumer units in dwellings , and the health and safety executive’s note page 4 of BS7671 . With out an explanation as to why he has to change the CU tells me it is another CU change for no real reason. Other than adding the cost of the new one to the bill.

@seandempsey7351 2 года назад

I feel I am wasting my time.

@GSHElectrical 2 года назад

@seandempsey7351 2 года назад

@@GSHElectrical because I seem to one in 10.000 who takes the time to read the health and safety executive’s note, and the guidance in the onsite guide yes there was a fault on the outside light but it doesn’t warrant a cu change .

@mb-electricalservices 2 года назад

@@seandempsey7351 Look up the reasons you require "additional protection" in a dwelling and there's your answer/s for a consumer unit change. 👌

@seandempsey7351 2 года назад

@@mb-electricalservices amendment 2 health and safety executive’s note page 2or4 BS7671, and page 99 in the onsite guide consumer units in dwellings, Also the regulations can only be applied from the time they come in , they are not and cannot be back dated, if a new regulation came in to day then it applies for from today onwards. Hence why we have a six month grace period before implementing AM2 and the previous edition is with drawn to allow current new installations to be completed. Witch will not nessoserely comply with amendment 2 Also additional protection applies to new installations not existing installations, ie full rewire and installation of a new circuit/ circuits. The fault was on the outside light probably water ingress all that was required was to replace the outside light fitting , problem solved.