Discuss RCD requirements for TT? in the UK Electrical Forum area at ElectriciansForums.net
That's the conclusion I'm arriving at, if the charger requires Type B RCBO, and why I'd directed the question to Risteard. I figure he might have considered this possibility.So if you want to fit an EVSE on a TT supply with upfront S type you effectively can’t?
Not that I have seen. Doepke have a good range of type B (at a price!) but none are delay ones to mk knowledge.
From my understanding A type are up to 6mA and F&B types are up to 10mA. Without knowing the manufacturers information I couldn't comment on how much leakage they have but some do stipulate B type RCDs so it must be a fairly high current they generate during normal use.But how much?
I would consider anything more than a few mA to be a fault, as one would expect the system (even at 48V or whatever considered "safe") to have insulation resistance of hundreds of kohm to earth.
If the EV charger is OK for a 30mA type B RCD than it would have to be below 15mA normally, or it is in the trip region. And as above, I can't see that sort of level saturating any type A RCD, and not a 100mA (or above) type AC.
If you had it off a 30mA AC RCD/RCBO I would be a bit more concerned
But for playing with some type-AC RCD FCU recently they would trip on the type A waveform OK, just too low current in one direction, and a little slow in the other direction.
So for sure if you could have significant DC then you need type B, but upstream of that I can't see it causing difficulties for any that are going to be selective anyway (so 100mA or above TT incomers).
You can. I did two recently for a well-known major courier company.So if you want to fit an EVSE on a TT supply with upfront S type you effectively can’t?
Sorry, was working until 8:30p.m. tonight so only seeing your post now. I haven't come across an RCBO with a Type B RCD characteristic (though they may exist). Any Type B RCD I have fitted has been an RCCB.That's the conclusion I'm arriving at, if the charger requires Type B RCBO, and why I'd directed the question to Risteard. I figure he might have considered this possibility.
Edit: Just spotted @Ian1981 post, which seems to confirm this thought.
There doesn't yet appear to be a great selection of available 2 pole time delayed 100mA Type S RCCBs, with Type A characterisitcs and I'm surprised that Wylex haven't yet introduced a version of the widely used WRMT100/2. Currently the best priced and most widely available options appear to be those from CP Fusebox and Lewden.
Sorry, was working until 8:30p.m. tonight so only seeing your post now. I haven't come across an RCBO with a Type B RCD characteristic (though they may exist). Any Type B RCD I have fitted has been an RCCB.
If a Type B RCD is needed then any upstream RCD will need to be Type B also. If Type A, then any upstream will need to be at least Type A.
You shouldn't have any issue finding a double pole Type A S-type RCCB - they are widely available.
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