ABB eVM1 Installation And Service Instructions Manual page 109

14.16 Insulation Test on CB secondary wiring
The IED unit is tested during production at 2kV, 50 Hz on all the input/output connections.
The routine insulation test is repeated during circuit-breaker manufacturing after wiring.
To avoid stressing the IED excessively, it is advisable to avoid repetition of the insulation
Warning!
tests on the installation. In any case, the communication connection to the IED, connector
-XB24 and the auxiliary supply connection connector -XB22 (protected by common mode
varistor of 275 V) both on the IED motherboard, must be disconnected prior any insulation
test. On the contrary, any malfunction can be occour causing loss of warranty.
If connection to IED is made with connector D-Sub 9 pin for DIN rail in the low voltage
compartment, disconnect this connection.
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