Would it be normal for my Safety cut (60Amp) to trigger in a lightening storm?

When we get a rather heavy thunderclap...almost a direct hit, the thing triggers, even on the 20mA setting.

Is the lightening inducing a charge to the mains and is this to be expected? I would be a bit peeved to come home and find everything in the freezer melted, or is it better than everything in the house melted.?

I have the safety cut where the mains enter the house, this then feeds the consumer unit, with RCB /RCDB or whatever they are for each wiring circuit, however, the Safe T cut always trips first, and never any of the relays from the consumer unit...any ideas?

That unit is designed to trip first - that is how it works. And a close lightning strike will sometimes trip it (several times a year for me in Bangkok I suspect). That is why many people do not put there freezer on the circuit and just wire from a non-protected circuit breaker (but make sure the unit has a proper ground).

You might want a small panel of breakers not on the Safe-T-Cut to include air conditioners and freezers and some lights.

That unit is designed to trip first - that is how it works. And a close lightning strike will sometimes trip it (several times a year for me in Bangkok I suspect). That is why many people do not put there freezer on the circuit and just wire from a non-protected circuit breaker (but make sure the unit has a proper ground).

You might want a small panel of breakers not on the Safe-T-Cut to include air conditioners and freezers and some lights.

Cheers for that!