Table 46 Normal
Ohm and Megohm Values Between All Leads and Ground |
| Condition of Motor and Leads |
Ohm Value |
Megohm Value |
A new motor (without drop cable).
A used motor which can be reinstalled in well. |
200,000,000 (or more)
10,000,000 (or more) |
200.0 (or more)
10.0 (or more) |
| Motor in well. Readings
are for drop cable plus motor. |
2,000,000 (or more)
500,000 - 2,000,000
Less than 500,000 |
2.0 (or more)
.50 - 2.0
Less than .5 |
New motor.
Motor in good condition.
Insulation damage, locate and repair. |
|
Insulation resistance varies very little with rating. Motors
of all HP, voltage, and phase rating have similar values of
insulation resistance.
Table 46 is based
on readings taken with a megohm meter with a 500VDC output.
Readings may vary using a lower voltage ohmmeter. Consult
Franklin Electric if readings are in question. |
|
