Left the spindle on for about an hour last night. It was fine. Just been using the lathe for quite a while and no problems there. So the former implies it's not the spindle and the latter implies it's not. That or it's nothing to do with the VFD.

Quote Originally Posted by 2e0poz View Post
The reason for this is because the oven is on in the house, when the temp on the oven gets to a certain point the temperature control causes an earth problem (expansion). A known issue with a lot of ovens if you google it
We do have dinner late ... but not past 11pm when it tripped! So I doubt it's the oven.

Quote Originally Posted by mocha View Post
Bring some power from the house or from next door!
Next door, too many awkward questions like 'What's a CNC Router'!
I'm going to try it once more as normal, then if that fails I'll use an extension lead.

Quote Originally Posted by mocha View Post
The RCCD you point to; 40amp? is it 30 or 100 mA?
30mA ... more is surely not safe?