Rockwell Automation 1512A MV Controllers - 800A One-High Cabinet - Manual (Page 44)

Common Installation 4-5
1512A-UM102B-EN-P – June 2013
4) Connect any external control wires to the control panel terminal
blocks in the low voltage compartment. Refer to wiring diagram.
Insulation integrity should be checked before energizing medium voltage
electrical equipment. Use a high voltage AC insulation tester or a Megger for
this test. If a Megger is used, a 5000 volt type is recommended.
A T T E N T I O N A T T E N T I O N
Exercise caution when performing high voltage
tests on the equipment. Failure to do so may
result in electric shock causing severe burns,
injury or death
A T T E N T I O N A T T E N T I O N
Disconnect power factor correction capacitors (if
so equipped) before performing the Hi-Pot test.
Failure to do so may result in personal injury or
damage to the equipment. See Power Lockout
Procedure, page 5-3, for information on
dissipating any stored power in the capacitors.
A T T E N T I O N A T T E N T I O N
Remove all primary fuses for the control power
transformer and/or the potential transformer.
Failure to do so may cause damage to the
equipment during the Hi-pot test.
Insulation can be tested from phase to phase and from phase to ground.
The recommended level for AC Hi-Pot testing is (2 X V
LL
) volts, where
V
LL
is the rated line-to-line voltage of the power system. The leakage
current must be less than 20 mA. Record the result for future comparison
testing.
If a Megger is used, it should indicate 50,000 megohms or greater if the
unit is isolated from the line and the motor. If the unit is connected to a
motor, the Megger should indicate 5,000 megohms or greater (phase to
ground).
Hi-Pot and Megger
Test