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NRTL mark, the first few pages of the NRTL certification report, Listing in an NRTL publication, or a copy
of the UL Yellow Card. Proof should contain the manufacturers name, product type, and model, standard
to which it was certified, the NRTL name or logo, the NRTL file number or license number, and a list of
any Conditions of Acceptance or Deviations. A Manufacturer's Declaration is not proof of certification by
an NRTL.
• The rack or cabinet must meet all electrical and mechanical safety legal requirements for the country in
which it is installed. The rack or cabinet must be free of exposed hazards (such as voltages over 60 V dc
or 42 V ac, energy over 240 VA, sharp edges, mechanical pinch points, or hot surfaces).
• There must be an accessible and unambiguous disconnect device for each product in the rack, including
any power distribution unit.
A disconnect device might consist of either the plug on the power cord (if the power cord is no longer
than 1.8 m (6 ft)), the appliance inlet receptacle (if the power cord is of a detachable type), or a power
on/off switch, or an Emergency Power Off switch on the rack, provided all power is removed from the
rack or product by the disconnect device.
If the rack or cabinet has electrical components (such as fan trays or lights), the rack must have an
accessible and unambiguous disconnect device.
• The rack or cabinet, power distribution unit and multi-outlet strips, and products that are installed in the
rack or cabinet must all be properly grounded to the customer facility ground.
There must be no more than 0.1 Ohms between the ground pin of the power distribution unit or rack
plug and any touchable metal or conductive surface on the rack and on the products that are installed in
the rack. Grounding method must comply with applicable country's electric code (such as NEC or CEC).
Ground continuity can be verified by your IBM service personnel, after the installation is completed, and
must be verified before the first service activity.
• The voltage rating of the power distribution unit and multi-outlet strips must be compatible with the
products plugged into them.
The power distribution unit or multi-outlet strips current and power ratings are rated at 80% of the
building supply circuit (as required by the National Electrical Code and the Canadian Electrical Code).
The total load that is connected to the power distribution unit must be less than the rating of the power
distribution unit. For example, a power distribution unit with a 30 A connection is rated for a total load of
24 A (30 A x 80 %). Therefore, the sum of all equipment that is connected to the power distribution unit
in this example must be lower than the 24 A rating.
If an uninterruptible power supply is installed, it must meet all the electrical safety requirements as
described for a power distribution unit (including certification by an NRTL).
• The rack or cabinet, power distribution unit, uninterruptible power supply, multi-outlet strips, and all
products in the rack or cabinet must be installed according to the manufacturer's instructions, and in
accordance with all national, state or province, and local codes and laws.
The rack or cabinet, power distribution unit, uninterruptible power supply, multi-outlet strips, and all
products in the rack or cabinet must be used as intended by the manufacturer (per manufacturer's
product documentation and marketing literature).
• All documentation for use and installation of the rack or cabinet, power distribution unit, uninterruptible
power supply, and all products in the rack or cabinet, including safety information, must be available
onsite.
• If there is more than one source of power in the rack cabinet, there must be clearly visible safety labels
for Multiple Power Source (in the languages that are required for the country in which the product is
installed).
• If the rack or cabinet or any products that are installed in the cabinet had safety or weight labels that
are applied by the manufacturer, they must be intact and translated into the languages that are required
for the country in which the product is installed.
• If the rack or cabinet has doors, the rack becomes a fire enclosure by definition and must meet the
applicable flammability ratings (V-0 or better). Totally metal enclosures at least 1 mm (0.04 in.) thick
are considered to comply.
Chapter 3. Planning for hardware 39
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