Grounding And Earth Leakage Current; Additional Resources; Equipment Clearance And Floor Loading - HP 245161-B22 - 10642 42U Rack Shock Pallet Best Practices Manual

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, make 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, a reliable grounded (earthed) connection is essential. HP recommends the use of a
PDU that is either permanently wired to the building's branch circuit or is provided with a non-
detachable cord that is wired to an industrial style plug. National Electrical Manufacturers Association
(NEMA) locking-style plugs or those complying with International Electro technical Commission (IEC)
60309 are considered suitable for this purpose. HP does not recommend using common power outlet
strips for this equipment.
Observe the following limits when connecting the product 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.

Additional resources

A power calculator is available at
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Catalog.xls
Also available is a ProLiant Rack/Site Installation Utility for purposes of reviewing the server loading
to determine the number of power supplies for the power supplies to be redundant and approximate
the electrical and heating load per server for facilities planning. The ProLiant Rack/Site Installation
Utility is available at
http://h30099.www3.hp.com/configurator/calc/Site Preparation Utility.xls
There is also a quick reference power cord matrix available at
ftp://ftp.compaq.com/pub/products/servers/proliantstorage/power-protection/powercordmatrix.pdf

Equipment clearance and floor loading

A clearance of 48 inches in front of a configured rack and 30 inches to the rear of a configured rack
is recommended. All buildings and raised computer room floors are engineered to provide a specific
floor loading.
WARNING
When configuring a solution, make sure that the floor loading
specifications are followed. Failure to do so may result in physical injury or
damage to the equipment and the facility.
http://h30099.www3.hp.com/configurator/calc/Power Calculator
.
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