Please do yourself a favor and blow this image up. This is the result of just 1-2mm's of movement and the dimple riding up and out of the hole in the pin..



Let's go over some of the major issues with this standard that lead to safety issues.


#1 Round plugs need to twist in order to lock into place. To facilitate this locking dimples are used to create the detent so you know the socket is in place.


#2 Due to the fact that this standard relies on twisting to lock the plug into the socket the fit of the round plug into the female socket is more sloppy than it should be and allows movement between socket and plug. Shore cords weigh a LOT and the cord alone can cause strain to the plug & socket, forget waves, boat movement or people stepping on the shore cord etc.... It is very rare that a shore cord is properly supported to strain relieve the plug & socket.


#3 We are trying to use this on boats and boats MOVE!!!


#4 Even just 1-2 millimeters of movement between the plug & socket can cause the dimple to ride up out of the hole and create even LESS contact area than this already unsafe standard has.


#5 There are no seals on this standard thus it is very easy for corrosion to set in on the pins & sockets and create even more resistance.


#6 The socket clamping mechanism/spring clamping feature is made from material just 1mm thick.. It does not take much pressure to loosen a 1mm spring clamp and provide less pressure for good contact.


#7 There are no thermal breakers in these plugs or sockets to open the circuit in the event of over heating, due to high resistance. Instead this can lead to a fire or darn near..