NCR 7458 - Manual (Page 26)

3-2 Chapter 3: Hardware Service
IT Power System
This product is suitable for connection to an IT power system with a
phase-to-phase voltage not exceeding 240 V.
Peripheral Usage
This terminal should only be used with peripheral devices that are
certified by the appropriate safety agency for the country of installation
(UL, CSA, TUV, VDE) or those which are recommended by NCR
Corporation.
Caution:
DO NOT connect or disconnect a printer, keyboard, or any
other terminal-powered peripheral while the terminal is powered on.
Doing so may result in peripheral or system damage.
Grounding Instructions
In the event of a malfunction or breakdown, grounding provides a
path of least resistance for electric current to reduce the risk of electric
shock. This product is equipped with an electric cord having an
equipment-grounding conductor and a grounding plug. The plug must
be plugged into a matching outlet that is properly installed and
grounded in accordance with all local codes and ordinances. Do not
modify the plug provided – if it will not fit the outlet, have the proper
outlet installed by a qualified electrician. Improper connection of the
equipment-grounding conductor can result in a risk of electric shock.
The conductor with insulation having an outer surface that is green
with or without yellow stripes is the equipment-grounding conductor.
If repair or replacement of the electric cord or plug is necessary, do not
connect the equipment-grounding conductor to a live terminal. Check
with a qualified electrician or service personnel if the grounding
instructions are not completely understood, or if you are in doubt as to
whether the product is properly grounded.
Use only 3-wire extension cords that have 3-prong grounding plugs
and 3-pole receptacles that accept the product’s plug. Repair or replace
damaged or worn cords immediately.