Laser Machine Grounding/Earthing

[Web Goblin]

The drawing makes a difference. Definately and additional earth connection then. I would follow their recommendation and install it as drawn.
If you do go down the TT route then make sure that you do disconnect the armour earth and any other earth connection you have coming from the house supply. Combining both of them wouldnt be a good idea.
Robin, what part of this "rant" would cause someone to be killed due to electrocution?

[Robin Hewitt]

Robin, what part of this "rant" would cause someone to be killed due to electrocution?

I like to add a disclaimer before I start to rant. If I guarantee death will follow my opinion I can hardly be blamed if proven correct.