Introduction - AEMC 4620 User Manual

"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."
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 sys-
tems are no exception.
• Use extreme caution when using the instrument around ener-
gized 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
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.
Digital Ground Resistance Tester Model 4620 and 4630

INTRODUCTION

Instruments considers the use of rubber gloves to be
®
CHAPTER 1
WARNING
- excerpted from IEEE Std. 81-1962
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