I few day ago someone had posted how the plugged in the power cord wrong (moved 
over 1 position)
on his K3 and wound up damaging the connector when the shorted the + Supply to 
the Neg PowerPole.


Note: It's a good Idea to fuse the power cord so that the fuse will blow if 
this happens.

A simple preventative measure to prevent the cord from being plugged in the 
wrong way would
be  to simply stick a stick on rubber foot on each side so that the plug will 
not go in if it's moved
over by one position.


When I build my distribution boxes I recess the PowerPoles. This physically 
protects
the PowerPole as well as protecting from the possibility of plugging the cable 
in wrong.
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