3. 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.
4. The rack or cabinet, power distribution unit and multi-outlet strips, and products
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 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 should be verified prior to the first service activity.
5. 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 percent of the building supply circuit (as required by the National
Electrical Code and the Canadian Electrical Code). The total load 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 Aconnection will be rated
for a total load of 24 A(30 A x 80 percent). Therefore, the sum of all
equipment connected to the power distribution unit in this example must be
lower than the 24 Arating.
If an uninterruptible power supply is installed, it must meet all the above
electrical safety requirements as described for a power distribution unit
(including certification by an NRTL).
6. 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).
7. 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 on-site.
8. 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
required for the country in which the product is installed).
9. If the rack or cabinet or any products installed in the cabinet had safety or
weight labels applied by the manufacturer, they must be intact and translated
into the languages required for the country in which the product is installed.
10. The rack or cabinet configuration must comply with all IBM requirements for
″safe to service″(contact your IBM Installation Planning Representative for
assistance in determining if the environment is safe).
172 IBM System Storage DS5020 Storage Subsystem: Installation, User’s, and Maintenance Guide