Depends on your level of responsibility. Megger adverts state the test RDC. The regulations and COP are a minimum requirement. Some engineers work to a minimum.

Unknown said:

Depends on your level of responsibility.

Unknown said:

The regulations and COP are a minimum requirement. Some engineers work to a minimum.

The CoP doesn't say "don't". I do concur that BS 7671 is the "minimum standard", and the CoP itself has recommendations that exceed BS 7671 requirements.

The CoP actually says "There might be some good reasons to test RDC-DD, but check your instruments are suitable first." - and again, you can go further if you wish.

Unknown said:

Megger adverts state the test RDC.

Agreed ... but even then, it's important with some models (of this and other manufacturers) to check you have the correct firmware to do the test, as discussed here.

We agree  I have liked talking to you. You have made the effort to learn. Type B is required for mode four. High frequency harmonics will create thermal damage to a type A plus RDC.

have a good evening mate, I am off for beer.

kind regards

Mark

I have a Megger 1741 and I could pay Megger to upgrade it to being a Megger 1741+ presumably with the latest version of the software to give a reasonably accurate test RDC-DD ramp test result, but I still would not know how long it took, only the tripping current at the end of the test period, not the tripping current that actually activated the RDC-DD and started the tripping process.

If I have that right, I’m not sure exactly what I would prove, other than it does trip eventually, not the actual tripping current and not the tripping time.

Megger may state test the RDC-DD, but they are trying to sell you the new all singing, all dancing black tester with red buttons and a colour screen for £1600, if the EVSE manufacturer is telling you to test the RDC-DD then it seems appropriate to do so, even though the Code of Practice is telling you don’t need to, but doing so because you are being told to do so by a tester manufacturer trying to sell you a new expensive tester may not be the best of ideas.

Not that I have anything against Megger, I have five of their testers and one of their EVSE testing adapters, I used my MFT1741 with the Megger testing adapter when I took the C&G exam, but I will never tell anyone they have to buy a new tester when they don’t need to.

Sparkingchip said:

even though the Code of Practice is telling you don’t need to,

Just to be pedantic, the CoP says that BS 7671 doesn't require the test but the manufacturer may specify it. It's a subtle but slight difference, and really aligns with what you are saying yourself - if the manufacturer says do it, definitely consider doing it.

Thank you

I slipped another post in that I was typing whilst you posted that last comment.

Enjoy your evening. GKenyon seems to  seems to know his stuff. Personally I would test the life out of a publicly accessible product that conducts. You can do the minimum if you like. Legally you will be sound. I need to sleep without worry.

I should hope so, I have the Fifth Edition of the IET EVSE COP of Practice in front of me, have a look at the top of page six.

Also, we were told that on the EVSE installers course I did that legally the Code of Practice has higher legal status than BS7671, so we should always refer to the COP and follow its recommendations rather trying to decide how to do it ourselves based on our own interpretation of the requirements in BS7671.