RCD Testing Frequency

Can you send a link on the updated info please. I have not looked at the issue since.

Unknown said:

Can you send a link on the updated info please.

https://easee.com/2023/07/04/this-is-how-we-will-rectify-the-chargers-in-sweden/

https://easee.com/uk/articles/easee-appeals-elsakerhetsverkets-decision/

Cheers

The best resource is the IET Guidance Note Three Table 2.17 page 96, ultimately though for verification we only do a X1 Type AC test at 0 and 180 degrees then record the highest test result, utter regardless of what type of RCD it is.

Now, the original question was about the frequency of EV charger RCD testing, not actually about how to do it!

Modular 61008/009 I personally would perform six monthly as a function. Some are self testing now with the RCD function built into the CB’s and are technically a departure. I don’t know what you could enforce. 

Give an example 

Sorry, of what?

   - Andy.

The multiple circuit  fault issue. My experience using design software was that it calculated this. You may know something I dont

Say a couple of T&E cables go though a common hole in a stud in a partition wall - plasterboard screw or picture nail or DIY's drill bit then hits them - clipping say L on a 50A/10mm² shower circuit and N on a 6A/1mm² lighting circuit. The only thing "protecting" the 1.0mm² lighting N conductor is the shower circuit's 50A OPD and also the fault loop impedance is increased as half of the circuit is now in 1.0mm² rather than 10mm² so disconnection times may well be extended.

In commercial and industrial environments it's common to have outgoing circuits from DBs wired in singles in common trunking - so any damage to insulation there is just as likely to result in a short between two different circuits as two wires of the same circuit.

Such faults are thankfully pretty rare, but not impossible.

AFAIK BS 7671 doesn't ask for such situations to be considered at all (e.g. see note below reg 434) - and I'm not aware of any software that does (but I have very limited experience of modern circuit design software, so willing to be presently surprised if it does).

   - Andy.

Fault current rating and disconnection time,  time tripping curve required of the protective device prevents this.