Site Preparation
7705 SAR-A Chassis Installation Guide 47
Warning:
• To properly transport and relocate a 7705 SAR-A chassis, do the following:
→ disconnect power to the chassis by opening the disconnect devices
→ detach all cables from the chassis; remove the protective ground connection last
→ if the chassis is installed in a rack, carefully remove it from the rack
→ repackage the chassis in its original packaging or an appropriately sized shipping
container for relocation
• The 7705 SAR-A systems powered by DC power should be installed in restricted
access areas, such as a dedicated equipment room or an equipment closet, in
accordance with Articles 110-16, 110-17, and 110-18 of the National Electric Code
ANSI/ NFPA 70.
• To provide necessary stability, ensure that the equipment rack is bolted to the floor.
Ceiling brackets are useful to provide additional stability.
• When wiring the unit, the chassis ground connection must always be made first and
disconnected last.
• When mounting the chassis in a rack, ensure that the rack complies with all
requirements outlined in Chassis Location Requirements.
• Maintain a clearance of at least 2.5 in. (6.4 cm) at the front of the 7705 SAR-A chassis
for cable management.
• Maintain a clearance of at least 2 in. (5.1 cm) on each side of the 7705 SAR-A chassis
to ensure adequate airflow.
• Maintain a clearance of at least 1.75 in. (4.4 cm) above and below the 7705 SAR-A
chassis to ensure adequate airflow.
• The 7705 SAR-A includes a chassis ground stud on the mounting bracket attached to
the right-hand side of the chassis (when viewed from the front). The chassis ground
must be connected to the building ground, using either a direct connection or a ground
bus.
• Electrostatic discharge (ESD) damage can occur if the 7705 SAR-A is mishandled.
Always wear an ESD-preventive wrist or ankle strap and always connect an ESD strap
to a nearby ground point that is connected to the site grounding point when working on
the 7705 SAR-A. Typical ground points include a properly grounded rack or work
bench.
• The washers and nut used to secure the chassis ground wire on the ground stud must
only be used for that purpose.
• Do not install equipment that appears to be damaged.
• Install the 7705 SAR-A chassis in the equipment rack before installing SFPs.
• Failure to comply with the equipment rack and chassis instructions as outlined in
Installation Locations and Chassis Location Requirements will cause thermal failure.
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