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990-0253A, Revision 2 6/9911
Appendix A: Rack Mount Supplement
Installation Tips for Rack Mount Units
Please observe the following items when installing the Rack Mount Redundant Switch:
• The Redundant switch is furnished with brackets for mounting in standard 19” (46.5 cm) rack mount brackets.
• Select a rack location with adequate air flow that is free from excessive dust. Do not operate the Redundant Switch where
temperature or humidity are outside the limits listed under Specifications.
Rail Hardware
There are different types of racks:
• Equipment Rack - usually an open rack with threaded mounting holes or no threaded holes.
• APC Netshelter , IBM, Vero, others - enclosed rack with square holes
• Dell, Compaq, Rittal - enclosed rack with square holes
• HP Rack - enclosed rack with round holes
These racks differ in the methods required for mounting equipment. They may have threaded
holes (hardware not included), round holes (require clip nut, shown below), or square holes
(require cage nut, shown below).
• Telecomm Rack - open rack with two poles / four poles and threaded round holes (hardware not
supplied by APC).
Included with the Redundant Switch are two kinds of nuts and screws for mounting your product:
• Clip nut 10-32 internal thread - best used with round holes - APC part number 810-2004
• Cage nut - 10-32 internal thread - best used with square holes - APC part number 810-2008
• Screw 10-32 Phillips Head Ornamental Screw - used with above clip nut and cage nut - APC part number 810-0002
Note:
Racks with threaded round holes do not require nuts. APC does not provide hardware for threaded racks. See your rack
supplier for this hardware or specifications for this hardware.
Check the type of rack you have against the hardware required for mounting in the table below.
Rack Type Hole Type Hardware Required Hardware Included
Equipment Rack Threaded, or No
Threads
See rack specifications if
threaded. If not threaded use APC
hardware
N/A if threaded. If not
threaded use APC
hardware.
Netshelter/Compaq/IBM/Dell Square Cage nut, 10-32 screws 810-2008, 810-0002
HP Round Clip nut, 10-32 screws 810-2004, 810-0002
Telecomm Threaded See rack specifications N/A