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2 InfraStruXure System - Installation and Start-Up
Warnings
Installation/Maintenance
Only a certified electrician can perform these tasks:
• Connect the Power Distribution Unit (PDU) to utility power
• Install an upstream circuit breaker
• Route and connect the power cables for under-floor wiring
• Connect a switch to the Emergency Power Off (EPO) interface on the PDU
Only a certified electrician or an APC Field Service Engineer can perform these tasks:
• Connect the PDU to the Symmetra PX UPS
• Perform maintenance of the PDU
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Install a circuit breaker to protect the PDU against over-current when you connect the PDU to utility
power.
See “Specifications” on page 41 to determine the type of circuit breaker to install.
Maintenance performed while the PDU is receiving input power
APC does not recommend that you perform maintenance of the PDU while it is receiving input power.
However, due to the critical nature of data center loads, this may occur. If you must perform maintenance
while the PDU is receiving input power, observe the following precautions to reduce the risk of electric
shock:
1. Never work alone.
2. Perform the maintenance only if you are a certified electrician who is trained in the hazards of live
electrical installation.
3. Know the procedure for disconnecting electricity to the PDU and the data center in case of an
emergency.
4. Wear appropriate personal protective equipment.
5. Use double-insulated tools.
6. Always follow local and site regulations when working on the PDU.