RCD Nuisance tripping tips and tricks tools and meters 

Megger DCM305E EARTH LEAKAGE CLAMP METER
0.001 mA resolution
Up to 100 A range for standard AC current measurements
TRMS reading
Low pass filter to aid stability of readings
Auto, data and peak hold
40 mm jaw
Analogue bargraph display for trending
The DCM305E is perfect for identifying and measuring the earth leakage current in a circuit where the RCD keeps tripping out unexpectedly. The measured result will quickly identify whether the earth leakage current present is excessive, causing the RCD to trip, or if the RCD itself is over sensitive or faulty.

Specially designed to check earth leakage currents, the DCM305E is an efficient and highly versatile instrument. It has six ranges 6 mA, 60 mA, 600 mA, 6 A, 60 A, 100 A with a minimum resolution of 0.001 mA on the 6 mA range. Its upper range also enables TRMS AC current measurements up to 100 A.

Additionally, this clampmeter vastly improves measurements on circuits with harmonics/electric noise on the cables using a low pass filter of 50/60 Hz.

Safety is of the utmost importance and with that in mind, the DCM305E exceeds the latest safety design standards IEC1010-2-32 and EMC requirements through a series of safety features that provide you with a safer working environment.

Other key functions include the “Data Hold” feature which aids in measurements where there is a problem with accessibility or poor lighting, and the automatic power off feature that extends the battery life.

IN THIS VIDEOThe Megger MFT1741+ Multifunction Tester is suitable for conducting full single- and three-phase insulation testing. As indicated above it is able to conduct single- and three-phase RCD testing between 10mA and 1A.

The Megger MFT1741+ Multifunction Tester’s NEW non-trip loop impedance testing technology also enables loop impedance testing of 10mA type AC and A RCDs. Additionally, NEW non-trip loop impedance technology prevents RCDs influencing the total loop impedance value and increases the speed of testing: non-trip loop impedance tests can be performed in eight seconds.

Furthermore, loop impedance tests are accompanied by a Confidence Meter, a NEW feature present on the Megger MFT1741+ Multifunction Tester. The meter will indicate the degree of confidence in the accuracy of the loop impedance measurement. This feature is useful as loop impedance values are particularly susceptible to changes in circuit noise. The Confidence Meter is designed to improve reliability; the digital ARC indicates the analytical process, and the measurement is continually monitored and adjusted in reference to the circuit noise.

Another NEW function present on the Megger MFT1741+ Multifunction Tester is its ability to test electric vehicle charge point RCDs; it includes automatic test sequences and a 6mA DC test (requires OPTIONAL accessory) for this purpose.

Measurements are viewable via the Megger MFT1741+ Multifunction Tester’s large, clear backlit display with a digital/ analogue arc for indicating fluctuating readings and a dual digital readout that displays precise readings and test parameters in parallel. For instance, the dual digital readout will display the output voltage used for the insulation test as well as the resistance value in MΩ. It is also possible to save readings to the Megger MFT1741+ Multifunction Tester’s internal memory (capacity for 1000 measurements); these results can be downloaded via Bluetooth.

Accessing the required measurement function and range is easy using the Megger MFT1741+ Multifunction Tester’s colour coded function controls. In addition to improving the efficiency and ease of testing, these controls also reduce the possibility of selecting the incorrect function or range. This instrument does not include complicated and/or hidden measurement menus.

Furthermore, the Megger MFT1741+ Multifunction Tester features an ambidextrous design with dual TEST and LOCK buttons on either side of the unit, ensuring that it is easy to operate for both right- and left-handed users. Moreover, the Megger MFT1741+ Multifunction Tester offers an automatic test start, removing the need to press the TEST button altogether. This function is particularly useful when holding probes and/or when using the Megger MFT1741+ Multifunction Tester whilst on a ladder.

IN THIS VIDEO

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[KevinSmith-phjv]

That megger miliamp tester is one of my favourite test instruments! Completely agree with ya!

[peterreynolds]

I bought that megger tester for a particular fault finding job and it paid for itself after its first use.

[terrymeade]

I agree with a few of the comments that it would be nice if you slow just a little. No disrespect ment. I am a spark and always watch videos to improve myself and my knowledge but it was difficult to take in what you were explaining because it was to fast and jumbled. Appreciate the time you have taken to make this video though.

[beeautomation]

Will you’re 100% qualified to teach mate! You’ve taught me a thing or two 😉… keep up with the quality vids!

[mikivooght]

Class video William!! Class bitta kit!!

[matthewsaunt]

Hi . I do fault finding as my day to day job. I usually just use insulation resistance to fault find. Trying to see if buying one of the clamp meters would make it quicker and and make life easier

[Михаиллеви]

Another great vid. Would be good to see the megger in action though.

[paul_my_plumbs_uk]

👍👍👍 2 core flex and trailing socket for leakage testing??

[graemesmith]

Great tech tip, I'll buy the cheapy one 1st, and then probably buy the mega

[Jay-jrro]

Another cracking video Will and definitely worth a watch is the GSH video demonstrating a break out lead.

Keep em coming mate 👌

[thetruth]

So if a piece of equipment is tripping the circuit due to alot of earth leakage whats the best thing to do? Put it on the other rcd side if it's dual rcd? It doesn't mean the equipments faulty does it?

[tzm]

Why would two RCDs in series trip together, after around 24 hours powered? But when there was only one RCD it did not trip! I didn't find a large current imbalance nor any ground currents. Any tips?

[marcofranks]

We weren't born with the knowledge. If we don't share information as a trade or skill we are doomed

[UCCLdIkRECGtaGmoqO-TQ]

Looked at the Megger but seems damn pricey for what it is. Seemed like you could probably get an equivalent for a third of the price, but then I've not used any to know what the actual differences may be.

[jj-hnll]

Midfielder always love your video's but trailing lead with earth taken out I think i know what you mean, but it needs more clarification . Not that I could present any better but Will some info seems a bit woolly/Vague. Keep making the Vids please.

[dthwrdo]

Just buy fluke tester if you want to measures amps! It will fluctuate in any event ! Just do the insulation resistance test ! Eliminate the cable ! Then plug back in each appliance one by one to find what appliance is causing the rcd to trip ! If that fails pat test all appliances ! Me myself i would unplug each appliance one by one to find what appliance is tripping the rcd first !

[O.i]

If your worried about teaching diyers then use terms only an electrician knows and don’t break it down in simple form so other electricians such as myself can learn off eachother rather than keeping things close to heart

[hallga]

Actually, why do you use the word 'actually' so much??

[drpantastic]

I heard a load of baffle not explained clearly at all.

[zulu]

Can you please do this vid again... IN ENGLISH 😳