Is it necessary to turn the busway power off before installing a plug-in unit?

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Issue:
Before installing a plug-in unit is it necessary to turn the busway power off?

Product Line:
Products sold in United States

Environment:
I-Line busway

Resolution:
Our plug-in unit installation instructions indicate that the busway should be de-energized before a plug-in unit is installed. Schneider Electric standard policy is that all electrical products should be de-energized before maintenance or installation.