HP TC4400 - Manual (Page 209)

Maintenance and Service Guide E–1
E
Power Cord Set Requirements
3-Conductor Power Cord Set
The wide range input feature of the computer permits it to operate
from any line voltage from 100 to 120 or 220 to 240 volts AC.
The power cord set included with the computer meets the
requirements for use in the country where the equipment
is purchased.
Power cord sets for use in other countries must meet the
requirements of the country where the computer is used.