Where is this plug? Is it in a so called waterproof box outside. I was just
wondering if water got into the plug at some point? Obviously it was not the
old fried spider thing that often happens to 13 amp plugs to cause this!
I think the crucial question is, did the charger actually did?
Brian

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In article ,
Clive Arthur wrote:
On 17/03/2019 14:18, Dave Plowman (News) wrote:
Old car needed the battery charged.

Plugged that in via an extension lead from an outside socket - which
has
an historical RCD just inside the house - from before when I fitted a
modern split load CU with RCD.

Charger was working and showing a charge, so left it to get on.

About an hour later, the house RDC tripped.

Unplugging the charger got things back to normal.

5 amp fuse in the charger plug had blown. Charger is an all plastic
type with a two core mains lead.

What sort of fault inside the charger could have caused the RCD to
trip?

Leakage from live or neutral to earth via the battery charging side
through the car body to ground? If it's an old charger, then
transformer breakdown could be the issue.

It's an SMPS type - no large transformer.

Of course the negative side of the DC output goes to the car bodywork.
Could enough current flow through the tyres?

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