User Service Guide, Fourth Edition - Server Expansion Unit

Chapter 2
Site Preparation
Electrical Specifications
3
Electrical Specifications
This section provides electrical specifications for the Server Expansion Unit.
Grounding
The site building shall provide a safety ground/protective earth for each AC service entrance to all cabinets.
Install a PE (protective earthing) conductor that is identical in size, insulation material, and thickness to the
branch-circuit supply conductors. The PE conductor must be green with yellow stripes. The earthing
conductor described is to be connected from the unit to the building installation earth or, if supplied by a
separately derived system, at the supply transformer or motor-generator set grounding point.
Circuit Breaker
The Marked Electrical for the Server Expansion Unit is 7A per line cord. The recommended circuit breaker
size is 20A for North America. For countries outside North America, consult your local electrical authority
that has jurisdiction for the recommended circuit breaker size.
The Server Expansion Unit contains two C20 power receptacles located at the bottom rear bulkhead. A
minimum of one power cord must be used to maintain normal operation of the Server Expansion Unit. A
second cord can be added to improve system availability by protecting, for example, against power source
failures or accidentally tripped circuit breakers. The Server Expansion Unit can receive AC input from two
different AC power sources.
System AC Power Specifications
Power Cords
Table 2-3 lists the various power cables available for use with a Server Expansion Unit system. Each power
cord is 15 feet (4.5 meters) in length with a IEC 60320-1 C19 female connector attached to one end.
Table 2-3 Power Cords
Part Number Description Where Used
8120-6895 Stripped end, 240V International—Other
8120-6897 Male IEC309, 240V International
8121-0070 Male GB-1002, 240V China
8120-6903 Male NEMA L6-20, 240V North America/Japan