Earthquake Bracing Requirements - Nortel Meridian 1 Planning, Installation And Operating Instructions

Page 20 of 536 Chapter 3 — System and site requirements

Earthquake bracing requirements

553-3121-210 Standard 3.0
— all electric motors
— electrical transformers
The following earthquake bracing guidelines conform to the
requirements for the state of California specifications in the U.S.A.
The guidelines recommend that the cabinets be mounted on a wall using a
sheet of 3/4 in. (20 mm) plywood as a backboard. The plywood should be
secured to the wall with a minimum of six fasteners. (Refer to Table 3 and
Table 4 for a description of appropriate fasteners.)
The following table identifies the maximum allowable wall height in
earthquake prone areas for various types of stud wall construction.
Table 3
Minimum wall requirements – stud construction
Wall Studs
2 in. x 4 in. wooden studs
2 in. x 6 in. wooden studs
3 5/8 in. 20 gauge metal studs
3 5/8 in. 18 gauge metal studs
January 1999
IMPORTANT
Spacing off
center
16 in. or 24 in.
16 in. or 24 in.
16 in. or 24 in.
16 in. or 24 in.
Maximum Height of
Wall
10 ft
16 ft
12 ft
16 ft