We used to get a lot of US equipment intended for their 240v system which had a fuse in both legs.
Pretty sure it wasn't entirely legal in OZ,but they "slipped through the cracks".
At one time,the orientation of "Active" & "Neutral" on power sockets ("GPOs") was a "recommendation" rather than a hard & fast rule.
I found that out the hard way!
We were fitting out a building with Surveiilance cameras.
They had "pan & tilt" heads,which worked on 240v (made in dear old Blighty!).
The motors had multiple connections to control the motor direction,plus cams which were adjusted to prevent the thing from smashing a lens against the wall,or other obstruction.
The local "Smart Person" made up a box with multi contact keyswitches to enable us to perform these adjustments,as the operators console had not yet arrived.
In the spirit of the "KISS" rule,he only switched the active line!
The manufacturers insulated the Active side of the wiring in the pan & tilt head,but left the Neutral side uncovered.
The process was:
Climb up the ladder,pop the panel open,wait while the "other guy" moves the thing around to as far as you want it to go,adjust the cams to make that the limit,do the other end of the travel,check,& so on.
Between each operation, the controls would be set to the "off" position,but the switch on the GPO powering the box was
not turned off.
There I am,on top of the ladder,the controls "off".
I try to reset the cam,my finger brushes over a microswitch,& next thing,I'm picking myself up from the floor.
Yep, reversed GPO connection!