NCR 7458 - Manual (Page 5)

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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.