Nortel Networks Option 11C Mini manual Wall

Page 46 of 332 Chapter 3 — System and site requirements

Earthquake bracing requirements for chassis installed on a wall in a vertical position

IMPORTANT

The following earthquake bracing guidelines meet the requirements for the state of California specifications in the United States. Other areas or countries can have different requirements.

CAUTION

For earthquake bracing, you must install the Option 11C Mini chassis on a wall in a vertical position.

Note: The earthquake bracing method for the Option 11C Mini does not guarantee that the system will continue to operate during or after an earthquake.

To earthquake brace your system, use a piece of 3/4 in. (20 mm) plywood as a backboard. Fasten the plywood to the wall with a minimum of six fasteners. (Refer to Table 9 on page 47 for a description of the appropriate fasteners.) Fasten the chassis to the backboard.

Table 8 identifies the maximum acceptable wall height for different types of stud wall construction in areas prone to earthquakes.

Table 8

Minimum wall requirements – stud construction

Wall Studs	Spacing off	Maximum Height of
	center	Wall
2 in. x 4 in. wooden studs	16 in. or 24 in.	10 ft
2 in. x 6 in. wooden studs	16 in. or 24 in.	16 ft
3 5/8 in. 20 gauge metal studs	16 in. or 24 in.	12 ft
3 5/8 in. 18 gauge metal studs	16 in. or 24 in.	16 ft

553-3021-209 Standard 3.00 April 2000