Discuss Interesting video on testing type "A"'s RCBO and issues with MFT 's in the UK Electrical Forum area at ElectriciansForums.net
Well I'm not surprised to hear thisI'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.
Megger are supposed to be top brand, me if I worked there I would start throwing the testers out the window and starting again.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!
No one is talking to each other in the industry to ensure things are rolled out properlyMegger are supposed to be top brand, me if I worked there I would start throwing the testers out the window and starting again.
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.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 was told that when this happens, the RCD does disconnect in its usual time, but the capacitor fools the tester into thinking the circuit is still live until it has discharged.Now what happens in a real world fault where someone is relying on an RCD for fault protection but there is a large Cap load. Will they be able to get the disconnection time the need for safety?
Thanks! Thats good to know.I was told that when this happens, the RCD does disconnect in its usual time, but the capacitor fools the tester into thinking the circuit is still live until it has discharged.
Can someone more knowledgeable than me please confirm or deny that this is what happens?
To be fair that advice has been around for a while, e.g. with a Type B RCD to test as AC, A and B.Finally watched it, interesting!
I was wondering at first how the guy from Megger could possibly come out of this looking good, without losing the "You need one of our newest and shiniest machines to test type A RCD's" selling point in spite of the both test and acceptable results not matching the manufacturing standards.
To give him his due, I didn't see the "Test them twice" line coming. Pure genius. Once for BS7671. And once to justify the extra cash we've just spent for a test that isn't actually required.
Reply to Interesting video on testing type "A"'s RCBO and issues with MFT 's in the UK Electrical Forum area at ElectriciansForums.net
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