IBM N6270 Hardware And Service Manual page 142

For units intended to be operated at 230 volts (outside the U.S.): Use a cord set
with a grounding-type attachment plug. The cord set should have the appropriate
safety approvals for the country in which the equipment will be installed.
IBM power cords for a specific country or region are usually available only in that
country or region.
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IBM System Storage: N6200 Series Hardware and Service Guide