HP BL260c HP BladeSystem c-Class Site Planning Guide - Page 35

Raceway systems (electrical conduits) (LAHJ) Raceways (electrical conduits) form part of the protective ground path for personnel and equipment. Raceways protect the wiring from accidental damage and also provide a heatsink for the wires. Any of the following types may be used: • EMT thin-wall tubing • Rigid (metal) conduit • Liquidtight with RFI shield grounded (most commonly used under raised floors) • Armored cable 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: Power requirements and considerations 35