Which type of sprinkler bulb indicates an ordinary temperature classification?

The orange bulb is indicative of an ordinary temperature classification in sprinkler systems. Sprinkler bulbs are designed to activate at predetermined temperatures based on their color coding. The orange bulb is calibrated to respond to heat levels typical in environments classified as ordinary hazard, which generally means a temperature range of 155°F (68°C) to 175°F (79°C).

This color coding is crucial for ensuring that the sprinkler system activates under the right conditions to effectively suppress fires. Each bulb color corresponds to specific temperature ratings, allowing for proper installation and operation based on the particular risks present in a given area. This classification is important for fire safety regulations and the proper functioning of sprinkler systems, helping to mitigate the risk of fire damage in places with common combustible materials.