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Figure 3-4 shows the connections
to a transformer (lighting 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 winding grounded.
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16
0.561.8187
Jumpers
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Figure 3-5
www.
Transformer
Grounding Lug
+
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Figure 3-4
Figure 3-5 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 resistance to ground
at the same time.
By removing the jumpers, readings
can be made between the individ-
ual conductors and ground.
Megohmmeter Model 6527
.com
Tested Winding
information@itm.
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