HP StorageWorks 9100 - Extreme Data Storage System User Manual page 38

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 enclosures connected to the same
power source, HP recommends the use of a power distribution unit (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 enclosure is not recommended.
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Rack and environmental requirements