45
B2.3.2 Verify that the ground and test
device frame interlock is correct for
the cell in which it is to be used.
B2.3.3 Confirm that the correct ground
and test device has been chosen
for grounding of the upper or lower
studs, as appropriate.
Note:
Rules of identification in section B1
and refer to Table 1: Type 38-3AH3-GTD
ground and test device types on page 7
as well as Figure 10: Type 38-3AH3-GTD
ground and test device type E for
grounding lower studs ‒ front view on
page 31, Figure 11: Type 38-3AH3-GTD
ground and test device type E for
grounding lower studs ‒ side view on
page 32, Figure 12: Type 38-3AH3-GTD
ground and test device type F for
grounding upper studs ‒ front view on
page 33, Figure 13: Type 38-3AH3-GTD
ground and test device type F for
grounding upper studs ‒ side view on
page 34, Figure 14: Elementary diagram
for device arranged to ground lower
studs type E on page 35 and Figure 15:
Elementary diagram for device arranged
to ground upper studs type F on page 35.
Release the latches and open the
cell door, and remove the type
38-3AH3-GTD ground and test
device from the circuit breaker cell
using the same procedures as for
removing the type 38-3AH3 38 kV
circuit breaker. Close the cell door
and secure latches.
B2.3 The procedure for dielectric testing
(or insulation resistance testing) of
primary circuits. It is imperative
that the user become totally
familiar with every aspect of a
ground and test device before
using it. The user must be certain
which primary circuits connect to
each primary disconnect (stud),
and the user must know if these
circuits are or could be energized
due to backfeed. The user must
make certain that the primary
circuit is de-energized before
performing any testing, including
testing for insulation resistance.
Make no assumptions, and
double check each step!
B2.3.1
Complete operational checkout of
the ground and test device and
familiarization routine, section B1
of these operation - device types E
and F instructions beginning on
page 37.
Hazardous voltage and high currents.
Can cause death, serious injury and property damage.
Check the following before inserting and racking the ground and test
device in the switchgear:
l
Voltage measuring probe rated for the primary circuit voltage.
l
Voltage measuring probe functional and in calibration.
l
Dielectric rubber gloves in use and tested for adequacy.
l
Sufficient probe or hot stick extension in use.
l
All rules of OSHA complied with.
l
All procedures per NFPA 70E "Standard for electrical safety in the
workplace" complied with.
