David Higton wrote:

> 2) The 0V pin must make contact first, followed by the power supply
> pin

Electrical theory says it doesn't make any difference if you contact ground
or power first.

> It's an unusual connector pair that
> would sequence the pins like that.

The obove can be seen on USB connectors, the power pins (both 0 and 5 volts)
are longer so as to make contact first, but there is no distincion between
both of them.

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