Insulation Resistance Readings; Typical Installations And Simplex Wiring Diagrams - Xylem IM127R07 Installation, Operation And Maintenance Instructions

INSULATION RESISTANCE READINGS

Normal Ohm and Megohm Values between all leads and ground
Condition of Motor and Leads
A new motor (without drop cable).
A used motor which can be reinstalled in well.
Motor in well. Readings are for drop cable plus motor.
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 ratings have similar values
of insulation resistance.
Insulation resistance values above are based on readings taken with a megohmmeter with a 500V DC output.
Readings may vary using a lower voltage ohmmeter, consult factory if readings are in question.
TYPICAL INSTALLATIONS
TETHER
LENGTH
CHECK VALVE
VENT
ON
OFF
Drawing 1
20,000,000 (or more)
10,000,000 (or more)
VENT
GATE VALVE
INFLUENT
BASIN
Ohm Value
2,000,000 (or more)
500,000 - 2,000,000
Less than 500,000
Drawing 2
Megohm Value
20 (or more)
10 (or more)
2 (or more)
.5 - 2
Less than .5
DISCHARGE
PIPING WITH
UNION AND
CHECK VALVE
INLET PIPING
WITH UNION
AND TRAP
9