Nortel Meridian 1 option 11C Planning And Installation Manual page 87

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This chapter provides important information for bracing the Option 11C
system cabinets against earthquakes. Cabinets must be mounted on the wall
in order to meet earthquake protection requirements.
Earthquake bracing is performed by securely fastening a 3/4 in.(20 mm) sheet
of plywood to the wall, then placing the system components on the backboard
(not attaching them directly to the wall).
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