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I'm doing it the other way around - getting my fuse upgraded and an isolator switch installed BEFORE the charger is installed. We have quite old electrics. The DNO has just upgraded my main fuse from 63A to 100A. Their main concern was whether the cable into my house was so old it would need an upgrade in itself. But it was OK and so it was simply a fuse upgrade (I wasnt expecting to end up at 100A, I thought it would be 80A). It was all quite efficient with the DNO (Northern PowerGrid), about 2 weeks from request through to site survey and then install. No charge.

If you've got no other heavy draws on your electricuity, I would guess that 80A would be sufficient. But I'm not an electrician!

Waiting for Octopus to install an isolator switch between the consumer unuit and the meter (and also upgrade the meter to SMETS2) feels much slower.
 
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