On Wed, 8 Mar 2017 11:01:06 -0500, Ralph Mowery
wrote:

In article ,
says...

Anyway, some require grounding by code, others don'r.

Many manufacturers put an IEC socket on the laptop power supplies because the power supplies will operate on multiple voltages. It's simple to change the cord that's shipped with the laptop depending on the area of the world it's sold in. It's the same with desktop computers. If the computer is shipped to a part of the world that uses 220vac 50hz, all you do is use a power cord that has the appropriate plug. t
(?)_/¯

[8~{} Uncle Power Monster

They have done that for many years, or in some cases like priners and
modems the power supply is seperte so they can just ship seperate
supplies depending on the country.

Many computers and some other devices have a switch for 120 or 240 volts
and that universal socket on the device. The suplies are really not
even that particular about the voltages, just get into the ball park
with them. Going 20 or 30 volts either way is fine.


Power supplies with 120/240 switches are SO 1990.