I think CU/MCB/RCD/RCBO terminals are +/- PZ
 

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The first time I used a +/- PZ I was surprised that I was able to put at least a quarter turn more on the terminal with the same effort, I was checking the tightness of them after installation with a standard PZ.
Same with a 5.5 slotted I reckon , you get sligthly more purchase on the terminal screw Vs a standard PZ or PH which can slip a bit when tightening down
 
The first time I used a +/- PZ I was surprised that I was able to put at least a quarter turn more on the terminal with the same effort, I was checking the tightness of them after installation with a standard PZ.
I then bought a Armeg torque screwdriver and that was a revelation how tight manufacturers expect the terminals to be torqued, in fact I sent it back to be re-calibrated as I thought surely not that tight, the Din Rail was bending with the pressure I was putting on it.
 
This one is more interesting than a lot I've seen recently. RCD doesn't work. Start whacking it, copying something he's seen on Instagram. (whacking it much too hard IMHO). It starts smoking.....!
I found the next bit hard to watch as I wanted to scream TURN IT OFF and LEAVE IT OFF!

(Obvious click-bait cover photo, it's nowhere near THAT interesting!)


Fair play to him, he did proceed to change the board at no cost.
 

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