American Design Drafting Association (ADDA) Certification Practice Exam

Temperature limit controls are critical for equipment connected to duct systems because these systems often handle substantial air volumes and can be involved in maintaining specific environmental conditions within a space. Temperature limits help prevent overheating, which could lead to equipment failure, fire hazards, or compromised air quality.

In systems involving ductwork, maintaining a set temperature is vital for operational efficiency and safety. Failure to control temperature can result in overheating of the system, which can lead to damage to both the duct and any connected components. Hence, the mandatory requirement for temperature limit controls is in place to ensure effective and safe operation.

While it's important for portable heaters, domestic refrigerators, and air conditioning units to have some form of temperature regulation, the specific requirements and mandatory nature of these controls often differ based on the contexts and regulations governing their operation. In particular, duct-connected systems typically have stringent codes due to their complexity and the risks associated with high air flows and temperature variations.