5 Energization
5.1 Pre-Energization
Before energizing any switchboard, a comprehensive inspection should be performed.
Ensure of the following checks:
1. All the shipping splits are connected and secured to the floor.
2. All adjoining fish plates are installed and torqued.
3. The switchboard is clean and free from any dust, dirt, or contaminates.
4. All gland/conduit plates are installed and secured to the switchboard.
5. The switchboard is grounded appropriately.
6. All withdrawable air circuit breakers are installed.
7. All covers and doors are installed, closed, and locked, if applicable.
5.1.1 Pre-Energization Tests
Prior to energization, the following tests must be performed on the switchboard, with all the breakers installed and closed, and
all control fuses/circuit breakers removed or open.
• Continuity checks of the main power circuit (it is advised to use a high-resolution resistance tester and record
the results, as these results can be compared during each service interval and any anomalies can be
investigated).
• Insulation resistance test.
• 2.2 kV Hipot test.
Once these tests are complete, the switchboard can be returned to its normal state with all control fuses/circuit breakers
installed or closed. The switchboard is now ready for energization.
5 Energization Proprietary and Confidential ©2024 Vertiv Group Corp. 39
Vertiv™ UL891 Switchboard Installer/User Guide
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