AEMC 6503 User Manual page 24

Figure 4-9 shows the windings of a three-phase motor separated.
Sometimes this can be done at the lead terminals while other times
the end bells must be removed to get at the lead wires of the coils.
By connecting the megohmmeter as shown, the phase insulation
resistance value can now be determined. Read between phases "A"
and "B", then "B" and "C", then "C" and "A".
C
A
B
Figure 4-9
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