JCC tricked my apprentice!

[Wilko]

It looks like it earths the fitting with a screw through the connector block onto the metal plate in the fitting?

Looks like L into 3rd terminal makes fitting live but something else provided a path to ground before anyone touched it.

 

[EbolaSideRoom]

That's just made my morning!!
Some problems, however rudimentary, need a new set of eyes, and it's part of the learning process for your 3rd yr apprentice to be able to get out of their own way and see just where they're being a dumbass. You'll be able to remind them of this for years....

 

[Bobster]

So you nor the training center have taught your apprentice the most basic of testing before powering up a circuit?

 

[EbolaSideRoom]

So you nor the training center have taught your apprentice the most basic of testing before powering up a circuit?

Also a fair comment.

 

[Squid]

So you nor the training center have taught your apprentice the most basic of testing before powering up a circuit?

Lick finger touch cable?