What is the color of the glass bulb in a 155°F (66°C) temperature-rated sprinkler head?
A . Orange or red
B . Yellow or green
C . Blue
D . Purple
Answer: A
Explanation:
The color of the glass bulb in sprinkler heads indicates the temperature rating at which the bulb will activate. These colors are standardized under NFPA 13:
155°F (66°C) temperature-rated sprinklers are classified as Ordinary temperature range, and the glass bulb is typically orange or red.
The colors correspond to the following:
Orange/Red: 135°FC155°F (57°CC68°C)
Yellow/Green: 175°FC225°F (79°CC107°C)
Blue: 250°FC300°F (121°CC149°C)
Purple: 325°FC375°F (163°CC191°C)
Reference: NFPA 13, Table 7.2.2.1: Sprinkler temperature ratings and corresponding bulb colors.
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