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Discuss Interesting video on testing type "A"'s RCBO and issues with MFT 's in the Electrical Forum area at ElectriciansForums.net

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loz2754

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Watched it yesterday.
The main thing they were plugging was that BS7671 tables for testing RCDs only apply to type AC RCDs. Therefore, the ECA chap was recommending that we test all RCDs on the type AC setting on our test equipment, regardless of the type of RCD under test.

Then the Lewden technical chap added that, for a type A, we should test first on the AC setting, then test again on the A setting. The results we record would be the results from the type AC, as this is what BS7671 is asking for on the schedule of year results.

Interesting discussion indeed.

They also touched on where in the circuit we should be testing RCDs....
 

GBDamo

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I've watched this twice now and it is a bit of a WTF moment.

It looks like everyone is looking at each other to figure out how the hell we ended up in this mess.

Manufacturer is getting massive returns as the devices are "failing" their answer is they're not failing by the specs that we use but don't publish.

MFT maker just looking blank.

The ECA chap made most sense with his "just test AC type as its the only test we have published targets to test against"

More comedy from the electrical industry.
 

Mikegh

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I've watched this twice now and it is a bit of a WTF moment.

It looks like everyone is looking at each other to figure out how the hell we ended up in this mess.

Manufacturer is getting massive returns as the devices are "failing" their answer is they're not failing by the specs that we use but don't publish.

MFT maker just looking blank.

The ECA chap made most sense with his "just test AC type as its the only test we have published targets to test against"

More comedy from the electrical industry.
Well I'm not surprised to hear this

I reckon there's definitely a knowledge gap to be filled in regard to testing of A and B type

Thankfully we don't series the RCDs over here which complicates matters a little further


Now maybe everyone is fully up to speed but I could see where I was mistaken a few minutes into the video
 

SparkySy

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What gets me is that megger are basically selling a lie and their tester can't properly test the type A B or F properly as it doesn't meet the manufacturer standard for testing them but does meet their standard for testing them wtf!
And that the manufacturer doesn't want to give up their standard information as they have probably paid a fortune to acquire it so they can make things to those standards.
That has really made my brain hurt!
 

buzzlightyear

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What gets me is that megger are basically selling a lie and their tester can't properly test the type A B or F properly as it doesn't meet the manufacturer standard for testing them but does meet their standard for testing them wtf!
Megger are supposed to be top brand, me if I worked there I would start throwing the testers out the window and starting again.
 

GBDamo

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What gets me is that megger are basically selling a lie and their tester can't properly test the type A B or F properly as it doesn't meet the manufacturer standard for testing them but does meet their standard for testing them wtf!
And that the manufacturer doesn't want to give up their standard information as they have probably paid a fortune to acquire it so they can make things to those standards.
That has really made my brain hurt!
I think the tester works it's just that there is nothing to relate the results to as that I the manufacturer's proprietary information and, for all we know they may well al be different.
 

SparkySy

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The megger guy states that they don't test to the same standard as the manufacturer and have a different standard that it complies to, he also says that their margin for a range is huge and they try and shrink the range to make testing more accurate.
As stated above its about time we all got on the same team and started communicating properly after all we are all supposed to be after the same outcome!
We as sparks don't want to be returning goods, the manufacturer doesn't want loads of returns, and our tester should be able to test to the same standard as the manufacturer and all the test data should be widely available surely?!



I'll wait for the optimistic GIF!
 

ElectroChem

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I quite liked the ECA guy's point - we're not out here popping fuses or even tripping breakers 'just to check they work' - we trust that reputable manufactures have made a product that will work as specified when it needs to.
If we can't be sure an RCD will work properly unless it's tested every 3/6/12/whatever months, are we really sure it will ever work?
 

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