Installation
94/214 Revision 06 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DB10 • 864-5091.9
Testing busbar system 2 ➭ Switch the circuit-breaker and the three-position disconnector of busbar system 1 in
the incoming panel to OPEN position.
➭ Switch the disconnector of busbar system 2 and the circuit-breaker in the incoming panel to
CLOSED position for the rated short-duration power-frequency voltage test.
➭ Fit dummy plugs on all free sockets of the incoming panel.
➭ While testing circuit-breaker panels: Fit dummy plugs on all sockets of the panel to be
tested.
➭ Earth and short-circuit all test sockets of the voltage detecting system.
➭ Switch all other three-position disconnectors to READY-TO-EARTH position.
➭ Apply the power-frequency test voltage in a surge-proof way at the cable connection
bushing via test adapters.
✔ The rated short-duration power-frequency withstand voltage test can now be performed.
Performing the power-
frequency voltage test
➭ Apply 80 % of the rated short-duration power-frequency withstand voltage consecutively to
phases L1, L2 and L3 for 60 seconds each.
Completing the power-
frequency voltage test
➭ Switch the voltage transformer disconnector of the disconnectable voltage transformers to
CLOSED position.
➭ After the test, mount non-disconnectable voltage transformers which are not suitable at
least for tests at 80% values according to IEC 62271-200.
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