How Leaky is your Earth Wire..?
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- čas přidán 1. 11. 2022
- Exploring intentional earth leakage current and how it can affect the design and operation of your electrical installation.
What are the recommendations in BS7671?
How does it impact your choice of consumer unit and circuit protection?
What is the easiest and most accurate way to measure earth leakage current?
👉 EARTH LEAKAGE CURRENT - WHERE it comes from and HOW to measure it. - MEGGER DCM305E VIDEO LINK • EARTH LEAKAGE CURRENT ...
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📹 Presented by
Joe Robinson - Technical Editor -eFIXX
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#efixx #megger #electricians - Věda a technologie
EARTH LEAKAGE CURRENT - WHERE it comes from and HOW to measure it. - MEGGER DCM305E
czcams.com/video/IGXto9zWmMc/video.html
Wouldn't current leakage to earth be measured by an ammeter over the earth conductor?
I've now watched your very informative video. Thank you for you technical thoroughness.
I have spoken to the plumber about the leak and he saya you can fix it using some CT1 (other brands are available). As always some real thought provoking stuff Joe
thank you for posting this
That's why standard RCDs are 30ma😉
Earth Leakage is to be expected with modern electronic powersupplies. They have plenty of input filtering and protection incorporating the earth conductor thus a few mA are lost on the earth...
Had a weird one this week earth leakage comming from the water bonding remove the jumper between the water meter and the current dissappears the fault was comming in externally note the supply is TNS too
Why can't you link the video in the short clip? Making things difficult.
they want you to search and get lost in the other videos i just watched 3 unrelated and cant find it....i will un subscribe lol
czcams.com/video/IGXto9zWmMc/video.html
here is the video hes talking about.. czcams.com/video/IGXto9zWmMc/video.html
related video... also check out my repair videos ! thanks
Visiting my parents a couple of years ago I found a 2.5A earth leakage.
That was fun.
Nail between the neutral and CPC on a kitchen circuit and no RCDs.
It should have been picked up at the time of installation in the early 90s, or at the time the kitchen circuit was split from another circuit, or at any of two periodic inspections that happened since. Kind of makes you wonder really...
Odd it caused such a low current if it was a dead short. A poor connection would have surely heated up enough to make itself obvious?
One in a million shot surely, wouldn't be fun if the earth ever got disconnected and everything becomes live!
@@kal9001 neutral and earth are combined up until they're split at the meter position, so they're at nominally the same voltage.
The neutral will be loaded more than the CPC (you'd hope) so the neutral will have a slight voltage referenced to CPC but nothing major, hence the low current.
@@tceng9449 In your original comment I somehow read it as a nail between live and earth!
Between Neutral and earth I'd expect it would split the return current down both. Ideally splitting 50/50 (But highly dependant on the relative impedance of the two paths with respect to each load)
@@kal9001 ah, yes, that would have been a more exciting fault!
Yeah been doing this for decades.
Static might best be better to leak or a silo will explode the rlectrucian is in excess from jnstaltuons say tobthecgamoly swucth off all itens andcstarg there theyvas a famiky hacevtime to play
What is the black attachment on the line conductor? I’ve seen them before but no idea what they are & what purpose they serve?
CT clamp for measuring the current usage of the property
@@byardelectrical thank you 👍🏻
I am just curious to know why should we care? As long as it doesn't give a.shovk when we touch it it can kwak 10000 amps if it wants to. And no, 10000 Amos will not haem you at no voltage.
If there's no voltage, what's causing 10kA to flow I wonder?
There HAS to be a voltage to cause current to flow. If 10kA is flowing through a wire, and the wire has just 1Ohm of resistance (150 meters of 2.5mm^2 copper), then that requires 10kV at the input end of that wire, and the wire will have to dissipate 100 megawatts over it's length (660kW per meter!)... I do suspect that would harm you quite a lot as the copper reaches sun surface temperatures and vaporises in your hand.
@@kal9001 well in my 53 years of being alive it hasn't yet given me a shock of any kind. I am guessing the the 2 thick plastic sheaths covering the wires helps a bit.😋
@@yogibear2k220 My point was you seem to display a fundamental lack of understanding of the relationship between current and voltage. Current cannot flow without a voltage, and depending where in the circuit you're measuring does impact if voltage is measurable or not.
The fact you don't think anyone should care about earth leakage says it all really... Excessive earth leakage is a sign of a fault that can lead to a fire or a shock from whatever is causing the fault, and wastes power.
Leakage current could mean the earth has an unsafe voltage closer to the faulty device, and shocks from things plugged in near the fault are possible, this is why earth resistance is important.
@@kal9001 Ok, I believe you. But, as a consumer and someone who just plugs things in and as long as they light up and don't go bang it's fine. So should I get one of those thingies to save my life? And being in a rental property tell my landlord if I find anything? I am still confused.
@@yogibear2k220 It shouldn't be needed no, if your home is protected by an RCD then the leakage will be capped, but it's one of the reasons people get nonsense RCD trips, if you're teetering on the edge already at say 25 mA, a tickle more can push it enough to trip.
If your bills are high for no apparent reason, you can check for earth leakage by testing both L and N, and power consumption by testing L only as you connect and disconnect different appliances to discover what is causing the excess usage.
If it can't be tracked down it could even be the wiring itself, especially on an older home with dodgy junction boxes and old wiring in god only knows what state under every floor - A layer of thick gloss paint may be the only thing stopping a short.
That's why leccy is expensive, we're fucking wasting it
7ma? That’s nothing
It's 1.68 watts, which will use 1kWh in just under 25 days. About 15kWh a year, which will cost about a fiver a year.
It's also not likely constant, and bringing on more appliances could raise that higher. It's possible as they have a spark sniffing around they have stuff turned off at the plugs that could raise that a lot.
Granted it's not much per house, but when you consider 25 million homes in the UK, even if they were all that low, it's still a huge waste if it can be avoided.