You are really asking "How well do you trust the maker's instructions ?"

That depends rather on the maker ;-)

In this specific example we all know that nearly all RCDs only get tested during EICRs or when they trip due to faults and accidents, whatever interval the writing on the box actually recommends.

Mike.

Unfortunately Mike, a large number of these are manufacturers you've only just heard of so I suppose that's the risk. Also, would it be the manufacturer of the equipment that decides or just the manufacturer of the RCD itself used within the equipment which is always different. 

Mark,

I would have hoped that the manufacturers have provided some kind of handbook or document for the "Users" responsibilities? i.e general fault/healthy indication, cleaning etc etc so could be the testing of RCD's is in the user guide, that said it will be integral with the charger, so may not be best for a duty holder that isnt competent to get access to. Or its in the maintenance manual and then dowwn to maintenance regime provided by the manufacturer themselfes if engaged or Duty Holder to put into place.

As mapj1 says unlikley they will get tested as 7671 indicates, only when there is a problem.

Cheers GTB

Mark Fleming said:

contained within a piece of electrical equipment

No, because it is a part of the electrical equipment as opposed to the installation.

A manufacturer is, of course, at liberty to install a test button; or indeed, the equipment could perform a self-test at intervals or when plugged in, etc.

61008 or 61009 stil has the requirement. I’d guess RDC - DD is same

Unknown said:

. I’d guess RDC - DD is same

Well, not necessarily ... but ... BS 7671 does not have any requirements to label for regular test of RDC-DD's, or even test them in initial or periodic verification!

Note 3 to Regulation 514.2.2, however, discuss the fact that the 2022 wording of what we used to call the "RCD label" can be applied "equally for other devices incorporating a user-test facility for operation by ordinary persons" - for example, AFDDs or RDC-DD's where the manufacturer recommends regular functional checks by the user.

I am aware pf section six AMD 2

There are reasons why we don’t test RDC-DDs, mainly that it cannot be done correctly with an electricians installation tester

support.myenergi.com/.../4403885493265-zappi-6mA-DC-protection-to-IEC-62955

You may want to have a word with Megger and Metrel then. And yes we do test them. BS7671 states an AC test is required for verification. But if you work for an authority or a public supplying company you will prove the device operates beyond 7671 requirements to keep possibility of anything litigious at bay.  

Sparkingchip said:

There are reasons why we don’t test RDC-DDs

Agreed ... this is also covered in the newly published 5th Ed of the IET CoP for EV Charging Equipment Installation (Section 9.6.6):

The reason it didn't appear in previous Editions, is that testing of RDC-DDs is not mandated in BS 7671. Whilst some manufacturers may recommend certain tests for commissioning, maintenance or fault-finding, it would appear that somehow the industry had come to see RDC-DD testing as some sort of 'requirement'.

The important issue to consider, is that the parameters of test for an RDC-DD (as you have indicated) are not the same as for the additional tests of a Type B RCD, and are not taken into account in BS EN IEC 61557-6.

Unknown said:

You may want to have a word with Megger and Metrel then.

The manufacturers of that equipment may have taken into account the parameters for RDC-DD - this is also covered in the IET CoP Section 9.6.6 as above "test instrument manufacturer’s specifications or user instructions should be checked to see that the test instrument is designed to conduct tests of RDC-DDs."

Unknown said:

BS7671 states an AC test is required for verification.

Of an RCD ... not an RDC-DD. (Reg 643.7.1 for ADS, and Reg 643.8 for additional protection, only mention RCD).

If RCD functionality is included in a single device to BS IEC 62955, then it's an RDC-PD not an RDC-DD, and the RDC-PD would be tested using Type AC as per RCD (and the manufacturer may also state conformity to BS EN 61008, BS EN 61009, BS EN 60947-2 or BS EN 62423 as well). Reg 722.531.3.101 of BS 7671:2018+A2:2022 lists the requirement RCDs must comply with for EV charging installations in the last para, and , BS IEC 62955 is not listed there - it is only listed for RDC-DDs in (ii) above that, where it must be used in conjunction with a Type A or Type F RCD, and it is therefore the Type A or Type F that would undergo the Type AC test, not the RDC-DD.

Unknown said:

But if you work for an authority or a public supplying company you will prove the device operates beyond 7671 requirements to keep possibility of anything litigious at bay.  

Agree 1000 % (no typo), although as above, you'd definitely need to check the test instrument has the right parameters, which I think is what Sparkingchip  was getting at in his post.