I assembled a liquid level control on the workshop bench this morning. I was in a rush so I just put the two 11-pin liquid level relays and 8 terminals on a loose piece of DIN rail, wired them up and quickly plugged it in the the bench supply to test it. I left it in the hands of my newest guy to fit everything in a box, mount it on the wall and fit the cables which were already existing. I wasn't expecting too much, he's not qualified and doesn't have any formal education or quals. I told him which enclosure to use but there was obviously some misunderstanding. I got back into the workshop tonight and had a quick look to see how he'd done.