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 A connection 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 A rating.
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).
There must be no unique maintenance procedures or tools required for service.
11. Elevated service installations, where the product(s) to be serviced are installed between 1.5 m and 3.7
m (5 ft. and 12 ft.) above the floor, require the availability of an OSHA- and CSA-approved
nonconductive step ladder. If a ladder is required for service, the customer must supply the OSHA-
and CSA- approved nonconductive step ladder (unless other arrangements have been made with the
local IBM Service Branch Office). Products installed over 2.9 m (9 ft.) above the floor requires a
Special Bid to be completed before they can be serviced by IBM service personnel.
For products not intended for rack-mounting to be serviced by IBM, the products and parts that will
be replaced as part of that service must not weigh over 11.4 kg (25 lb). (Contact your Installation
Planning Representative if in doubt).
12. There must not be any special education or training required for safe servicing of any of the
product(s) installed in the racks. (Contact your Installation Planning Representative if in doubt).
148 IBM System Storage DCS3700: Installation, User, and Maintenance Guide
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