According to California seismic requirements, electrical equipment weighing more than 400 pounds must be:
Correct Answer
D) Anchored and braced according to CBC Chapter 13 seismic provisions
California Building Code (CBC) Chapter 13 contains specific seismic design requirements for nonstructural components, including electrical equipment. Equipment weighing over 400 pounds must be properly anchored and braced to resist seismic forces. This prevents equipment failure and maintains electrical system integrity during earthquakes, which is critical in California's seismically active environment.
Why This Is the Correct Answer
CBC Chapter 13 governs seismic design requirements for nonstructural components, including heavy electrical equipment. Equipment exceeding 400 pounds must be anchored and braced per these provisions to resist seismic forces. Both anchoring (prevents sliding/overturning) and bracing (resists lateral movement) are required — neither alone is sufficient.
Why the Other Options Are Wrong
Option A: Anchored only at the base with concrete anchors
Base anchoring with concrete anchors alone is insufficient. While anchoring prevents the equipment from sliding, it does not resist lateral rocking or overturning forces that seismic events generate. CBC Chapter 13 requires both anchoring and bracing.
Option B: Secured with standard wall mounting brackets
Standard wall mounting brackets are designed for lightweight equipment and do not provide the engineered seismic resistance required for equipment over 400 pounds. This approach does not meet CBC Chapter 13 requirements.
Option C: Mounted on vibration isolation pads only
Vibration isolation pads address operational vibration from running equipment but provide no seismic resistance. In fact, improperly designed isolation systems can increase seismic movement. Pads alone cannot satisfy CBC Chapter 13 seismic requirements.
Memory Technique
400 lbs = anchor + brace. Think 'heavy equipment needs two hands to hold it during a quake — one anchor at the base, one brace at the side.' CBC Chapter 13 = the seismic chapter for nonstructural components.
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