Digital Ground Resistance Tester Model 4500
3
CHAPTER 1
INTRODUCTION
Warning
“It should be impressed on all personnel that a lethal potential can exist
between the station ground and a remote ground if a system fault involving
the station ground occurs while tests are being made. Since one of the
objects of tests on a station ground is the establishment of the location of
an effectively remote point for both current and potential electrodes, the
leads to the electrodes must be treated as though a possible potential
could exist between these test leads and any point on the station ground
grid.”
- excerpted from IEEE Std. 81-1962
These safety warnings are provided to ensure the safety of per-
sonnel and proper operation of the instrument.
• The instrument must not be operated beyond its specified
operating range.
• Safety is the responsibility of the operator.
• All metal objects or wires connected to the electrical system
should be assumed to be lethal until tested. Grounding
systems are no exception.
• Use extreme caution when using the instrument around
energized electrical equipment.
• Never attempt to use the instrument to twist or pry the
ground electrode or ground wire away from the equipment
being grounded.
• AEMC
®
Instruments considers the use of rubber gloves
to be an excellent safety practice even if the equipment is
properly operated and correctly grounded.
• Always inspect the instrument and leads prior to use.
Replace any defective parts immediately.
