for Protection of Electronic Computer/Data Processing Equipment). For electrical power ratings on options,
refer to the product rating label or the user documentation supplied with that option.
WARNING:
To reduce the risk of personal injury, fire, or damage to the equipment, do not overload the AC supply
branch circuit that provides power to the rack. Consult the electrical authority having jurisdiction over
wiring and installation requirements of your facility.
CAUTION:
Protect the server from power fluctuations and temporary interruptions with a regulating uninterruptible
power supply. This device protects the hardware from damage caused by power surges and voltage
spikes and keeps the system in operation during a power failure.
Electrical grounding requirements
The server must be grounded properly for proper operation and safety. In the United States, you must install
the equipment in accordance with NFPA 70, 1999 Edition (National Electric Code), Article 250, as well as any
local and regional building codes. In Canada, you must install the equipment in accordance with Canadian
Standards Association, CSA C22.1, Canadian Electrical Code. In all other countries, you must install the
equipment in accordance with any regional or national electrical wiring codes, such as the International
Electrotechnical Commission (IEC) Code 364, parts 1 through 7. Furthermore, you must be sure that all
power distribution devices used in the installation, such as branch wiring and receptacles, are listed or
certified grounding-type devices.
Because of the high ground-leakage currents associated with multiple servers connected to the same power
source, Hewlett Packard Enterprise recommends the use of a PDU that is either permanently wired to the
building’s branch circuit or includes a nondetachable cord that is wired to an industrial-style plug. NEMA
locking-style plugs or those complying with IEC 60309 are considered suitable for this purpose. Using
common power outlet strips for the server is not recommended.
Connecting a DC power cable to a DC power source
WARNING:
To reduce the risk of electric shock or energy hazards:
• This equipment must be installed by trained service personnel, as defined by the NEC and IEC
60950-1, Second Edition, the standard for Safety of Information Technology Equipment.
• Connect the equipment to a reliably grounded Secondary circuit source. A Secondary circuit has no
direct connection to a Primary circuit and derives its power from a transformer, converter, or
equivalent isolation device.
• The branch circuit overcurrent protection must be rated 27 A.
WARNING:
When installing a DC power supply, the ground wire must be connected before the positive or negative
leads.
WARNING:
Remove power from the power supply before performing any installation steps or maintenance on the
power supply.
CAUTION:
The server equipment connects the earthed conductor of the DC supply circuit to the earthing conductor
at the equipment. For more information, see the documentation that ships with the power supply.
34
Electrical grounding requirements
