On Fri, 05 May 2017 21:02:01 -0400, tom wrote:

That connector is commonly called an IEC connector. It can be either 120
or 240 volts.

If you let us know the model of the HP equipment, someone can most
likely direct you to a PDF copy of the service manual with all the
answers.

Wouldn't help. These pieces of equipment are internally or externally
switchable between 120 and 240V so you need to know what that switch has
been set to. I think HP IIRC also used another scheme whereby you placed
the appropriate fuse in the appropriate holder for the voltage of the
country in question. So you would have two fuse holders, one for 120V and
one for 240V and you placed your fuse - say for example 1A for 240V or 2A
for 120V - in the appropriate fuse-holder. Have a look around the sides
and bottom of the casing for any clues.