Comprehensive and Detailed Step-by-Step Explanation:
Hazard Classifications for Sprinkler Systems:
Per NFPA 13 (Standard for the Installation of Sprinkler Systems), Section 5.3.2, garages used only for parking vehicles are classified as Ordinary Hazard (Group 1).
Why Ordinary Hazard (Group 1) Applies:
Vehicle parking areas present moderate fire loads due to combustible materials (tires, upholstery, fuel tanks).
Other Options Explained:
Option A (Light hazard): Incorrect; light hazard applies to areas with minimal combustible materials.
Option C (Ordinary hazard Group 2): Higher risk areas like repair shops fall into Group 2.
Option D (High hazard): Not applicable; garages used solely for parking do not present high hazard risks.
Summary:
Sprinkler systems in garages used only for parking vehicles are designed for Ordinary Hazard (Group 1).