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Last Post by Transparent 1 hour ago
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Transparent
 Transparent
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05/11/2025 9:10 am  

Posted by: @agentgeorge
↑

What is foxing me with doing this is getting the type B rcd for CU I have, so I cant move the ASHP from its Cinch CU which has the type B in it :-/

Would that be a Chint RCD perhaps?

Have a look at this topic on high current trips, where I mention a number of potential manufacturers and suppliers for the trip being sought by BatPred.

RCDs TypeB

For the benefit of others wanting to follow this discussion,
this chart shows the features found in the four types of earth leakage trip:

RCD type

The majority of EV chargers are installed using a Type-A trip.

But the OVO Trial of V2G chargers five years ago showed that there was a significant DC component in the fault leakage current.
So they installed Type-B trips from then on.

 

Type-B RCD trips used to be very rare, and cost more than £200 each.

For a V2G charger, it would also need to be bi-directional of course.

It was usually the case that the installer needed a separate RCD and MCB.

However, we are now starting to see manufacturers responding to the market, and designing an RCBO Type-B.

image

This one from Proteus is also C-curve.
That means the trip-time is slower than the usual B-curve we find in domestic installations.

A C-curve is less prone to spurious tripping from switch-on surge currents


This post was modified 59 minutes ago by Transparent
This post was modified 58 minutes ago by Transparent

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