Criterion AVC-25VA Manuel D'instructions page 8

Installation Instructions
The AVC-25VA is supplied completely wired and ready for operation
without special installation. Simply plug the line cord into any
convenient 120-V AC line outlet.
NOTE: A 3-wire U-ground outlet is necessary to ensure proper grounding of
the instrument cabinet. This instrument incorporates a special ground sensor.
Unless the outlet into which it has been plugged is correctly wired and has a
good ground, the test set will not operate, and a small red pilot lamp (LINE
FAULT) will light, warning the operator that the wiring in their building is faulty.
A momentary flicker of this lamp is normal when the power is turned on. If
the lamp remains on, there is a wiring fault that must be corrected before
proceeding. It is dangerous to operate any equipment when there is a line
fault, particularly if there is a defective ground.
It is EXTREMELY IMPORTANT that the electrical ground is good. An
extra GROUND terminal is provided at the rear of the cabinet, and it is
recommended that this be connected to a separate, properly grounded
source using wire of AWG #14 or larger.
WARNING: Ensure that the instrument is grounded. The GROUND
terminal on the rear should be connected directly to the same metal
conduit or structure known to be a reliable ground.
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