3Com 7000 manual The rack should be made of steel

108APPENDIX C: SITE REQUIREMENTS

■Use an open style, 19-inch rack. The rack styles shown in Figure 16 facilitate easy maintenance and provide excellent ventilation.

■The rack should use the universal mounting rail hole pattern identified in IEC Standard 297.

■The rack should be made of steel.

■The rack should support approximately 272 kilograms (600 pounds).

■The rack should have adequate electrical grounding. A distribution rack grounding kit may be used.

■The rack should be attached to the wiring closet floor with 9.5 millimeters (3/8 inch) lag screws or equivalent hardware. The floor under the rack should be level within 5 millimeters (3/16 inch). Use a floor leveling cement compound if necessary or bolt the racks to the floor.

■Brace open racks if the channel thickness is less than 6.4 millimeters (1/4 inch).

■Install equipment in the lower half of the equipment rack to avoid making the rack top too heavy.