APC InfraStruXure Power Supply - Manual (Page 37)

InfraStruXure Site Planning, Installation, Start-Up 29
Start-Up Procedure
Safety warnings
Ensure that all power is off
Only APC Field Service Engineers or qualified, APC-trained personnel may
perform a system start-up.
Before you proceed, ensure that power is off by following the procedure in this
section.
1. Open (turn OFF) the PDU main input.
2. Set the upstream input circuit breaker (utility or
UPS) to the OFF or Locked Out position.