What is the temperature rating of an uncolored bulb?

What is the temperature rating of an uncolored bulb?

• A. 286
• B. 360
• C. 440/500
• D. 170

Answer: (D)

The temperature rating of an uncolored bulb, typically referred to as a glass bulb without any additional color coding, is established at 170°F (77°C). This temperature rating is critical because it delineates the activation point of the sprinkler when subjected to heat from a fire. At this temperature, the heat-sensitive element in the bulb will break, allowing water to be released from the sprinkler and helping to suppress the flame. Understanding the significance of the temperature rating is essential for fire protection professionals because it dictates when the sprinkler system will engage during a fire event. An uncolored bulb is typically used in environments where the risk of fire is present but does not have specific hazards that would necessitate a higher temperature rating.

The temperature rating of an uncolored bulb, typically referred to as a glass bulb without any additional color coding, is established at 170°F (77°C). This temperature rating is critical because it delineates the activation point of the sprinkler when subjected to heat from a fire. At this temperature, the heat-sensitive element in the bulb will break, allowing water to be released from the sprinkler and helping to suppress the flame.

Understanding the significance of the temperature rating is essential for fire protection professionals because it dictates when the sprinkler system will engage during a fire event. An uncolored bulb is typically used in environments where the risk of fire is present but does not have specific hazards that would necessitate a higher temperature rating.