Because the IET is usually a decade behind the real world - by their own admission. With solar on it's own it probably isn't as much, but with battery storage now becoing popular and island mode now appearing it problably is starting to be more of an issue. We've had this with the first couple of goes at AFDD's with the stupid lookup likelyhood of lightning which thankfully got quickly abandoned, to the then EV charing points about having PEN protection and all that

As long as you're using a RCD type A that's correct. With type B RCD it's a bit different, because of the electronics inside.

Thanks bro ❤️

I believe uni-directional RCBOs if powered from the load side have the potential for the solenoid and RCD logic board to burn out as they remain energised, proteus did a good video explaining it, the bi-directional RCBO’s have an additional contact internally. I believe that this same level of protection can be achieved with and MCB and RCCB both of which have generally been bi-directional for years, do check specs though, verso have a little PV board that does exactly this 🤝🏼

@@residualcurrent But if the microgeneration (inverter) detects no grid, It shuts down almost instantly and doesn't generate any power, to "back feed" a RCBO. Having a Bisdirectional would leave an extra level of safety especially if its just a drop in replacement rcbo, on any future installs.

I'm no expert in these matters, not by any means. I'm just an older bloke that had little to do with RCDs having worked in the '80s. It's about 2 things from what I can tell. The manual test button being held in for an extended period, which is the main concern, and devices that do not switch the neutral. The test button part is obvious, but the neutral part may not be. From what I've read about the ICs used etc no RCD latches the earth fault state - ie once the imbalance through the CT ceases the coil current is reduced back to pre-trip condition (there is always minor current through the trip coil with electronic types). This is backed up by actually experimenting with several 'directional' RCD/RCBOs available in Australia, the trip is repeatedly fired with supply on the wrong side and you can hear it but once the imbalance stops so does the firing. Of course, there may well be an RCD out there that does latch the condition and does place high current through the coil essentially until it burns out. Imagine you have a non-neutral switching electronic RCD, a N/E fault downstream of the RCD, and supply on the wrong side which will keep the electronics working post trip. The RCD will trip but imbalance potentially remains present due to the N/E fault, so the coil is left with high current indefinitely. A magnetic RCD would have a similar issue with N/E faults since the coil is powered by the CT directly but I'm not sure if it would cause a problem since it's only trying to disrupt the hold-in magnet rather than whacking the heck out of the trip mechanism like electronics do. Ensuring the use of neutral switching RCDs will address N/E faults, switching the test circuit addresses excessively long presses of the test button. Happy for anyone to make any comments about the above to explain why it may be incorrect.

@@GraemeMcKeague the issue is when a solar panel system is wired into a consumer unit, They typically wire the load side of the RCBO from the solar inverter so are always receiving load on the load side of the circuit breaker (it’s always back feeding when inverter is making power) so it might destroy the RCBO circuitry if it’s not bi-directional Same would happen if using ac couple battery storage system when it is discharging the power to the house it will be backfeeding via the load side of the RCBO

Haha very kind! It’s good to be back 🤝🏼

Thanks man, I’m all good!

@@residualcurrent🙏