HP ProLiant SL270s HP ProLiant SL Servers Planning Guide - Page 26

Building distribution, Grounding requirements, Grounding systems, Grounding and earth leakage current

Page 26 highlights

Building distribution All building feeders and branch circuitry should be in rigid metallic conduit with proper connectors (to provide ground continuity). Conduit that is exposed and subject to damage should be constructed of rigid galvanized steel. Grounding requirements This equipment must be grounded properly for proper operation and safety. In the United States, you must install the equipment in accordance with NFPA 70 (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 this equipment, HP 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 to supply power to this equipment is not recommended. Grounding systems HP systems are tested and certified only with grounding systems in which a neutral return path and a protective earth are separate conductors without any inserted impedances. Additionally, the protective earth and return neutral wires are shorted together at the XO bonding junction on the secondary side of the newly derived power source. Grounding and earth leakage current For proper operation and safety, rack components must be properly grounded in accordance with any local and regional building codes. Furthermore, be sure that all power distribution devices used in the installation, such as branch wiring and receptacles, are Listed or Certified grounding-type devices. Observe the following limits when connecting products to AC power distribution devices: • For UPS products and PDUs that have permanently attached AC power cords or are directly wired to the building power, the total combined leakage current should not exceed 5 percent of the total input current required for the connected products. • For UPS products and PDUs that have detachable AC power cords, the total combined leakage current should not exceed 3.5 mA per PDU or UPS. Power distribution safety grounding (LAHJ) The power distribution safety grounding system consists of connecting various points in the power distribution system to earth ground using green (green/yellow) wire ground conductors. When tied to metal chassis parts that might be touched, these ground connections protect computer room personnel against shock hazard from current leakage and fault conditions. Power requirements and considerations 26

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Power requirements and considerations
26
Building distribution
All building feeders and branch circuitry should be in rigid metallic conduit with proper connectors (to
provide ground continuity). Conduit that is exposed and subject to damage should be constructed of rigid
galvanized steel.
Grounding requirements
This equipment must be grounded properly for proper operation and safety. In the United States, you must
install the equipment in accordance with NFPA 70 (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 this equipment, HP 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 to supply power to this equipment is
not recommended.
Grounding systems
HP systems are tested and certified only with grounding systems in which a neutral return path and a
protective earth are separate conductors without any inserted impedances. Additionally, the protective earth
and return neutral wires are shorted together at the XO bonding junction on the secondary side of the newly
derived power source.
Grounding and earth leakage current
For proper operation and safety, rack components must be properly grounded in accordance with any local
and regional building codes. Furthermore, be sure that all power distribution devices used in the installation,
such as branch wiring and receptacles, are Listed or Certified grounding-type devices.
Observe the following limits when connecting products to AC power distribution devices:
For UPS products and PDUs that have permanently attached AC power cords or are directly wired to the
building power, the total combined leakage current should not exceed 5 percent of the total input
current required for the connected products.
For UPS products and PDUs that have detachable AC power cords, the total combined leakage current
should not exceed 3.5 mA per PDU or UPS.
Power distribution safety grounding (LAHJ)
The power distribution safety grounding system consists of connecting various points in the power distribution
system to earth ground using green (green/yellow) wire ground conductors. When tied to metal chassis parts
that might be touched, these ground connections protect computer room personnel against shock hazard
from current leakage and fault conditions.