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Figure 7 shows the connec-
tions to a transformer (light-
ing or distribution). Make
sure that the switches
and/or circuit breakers on
both sides are open. Check
the high voltage winding to
ground, low voltage to
ground, and the resistance
between them with no wind-
ing grounded.
MEGOHMMETER
MODEL 1020
90.6
DATA HOLD
OFF
ON
MΩ
TIMER
Man.
3 Min.
500 V
250 V
Ω
~
V
AC
TEST
MΩ
~
V
/Ω
AC
- Line
–
+
14
Jumpers
Ω
+ Earth
Figure 8
Transformer
Grounding Lug
MEGOHMMETER
MODEL 1020
Ω
DATA HOLD
OFF
ON
MΩ
TIMER
Man.
3 Min.
500 V
250 V
Ω
~
V
AC
TEST
MΩ
~
V
/Ω
AC
- Line
+ Earth
-
+
Figure 8 shows the connections
for measuring the insulation of a
three-phase line to ground by
connecting the jumpers between
phases. This gives a reading of
all conductors at once. If a load
such as a motor, heater, etc., is
attached to the other end of the
line, it will read the load resis-
tance to ground at the same time.
By removing the jumpers, read-
ings can be made between the
individual
conductors
ground.
Megohmmeter Models 1020 and 1025
Tested
Winding
Figure 7
and
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