What temperature does the bulb color red indicate for ordinary sprinklers?

The bulb color red indicates a temperature rating of 155°F for ordinary sprinklers. This means that red bulbs are designed to activate when the temperature reaches this specific threshold, which is critical for effective fire protection in environments commonly found in commercial and residential settings. Ordinary sprinklers with red bulbs are suitable for areas where the ambient temperatures do not exceed this level, making it essential for these devices to accurately detect heat and respond to fire conditions.

Understanding the temperature rating associated with each color coding is vital for sprinkler fitters, as it ensures the correct installation of fire protection systems that align with the specific hazards of a building's environment. The distinction between the color-coded bulbs helps in selecting the appropriate sprinklers for various applications, ensuring effective fire suppression.