Nate Electrical Practice Exam

Which of the following is a safety control?

1. Thermostat

2. High pressure control

3. Low pressure control

4. Humidistat

The correct answer is: High pressure control

The selection of high pressure control as a safety control is appropriate because it serves a critical role in preventing potentially dangerous conditions in HVAC systems. High pressure controls are designed to safeguard the system from exceeding safe operational limits. When the pressure in the refrigerant system becomes too high, the high pressure control will disengage the compressor, stopping it from running and thereby preventing damage or failures that could lead to leaks or even catastrophic situations. In comparison to other options, while devices like thermostats and humidistats are important for operational efficiency and comfort, they do not directly implement safety measures against equipment malfunction or failure. Low pressure controls are also forms of safety devices but primarily focus on preventing low refrigerant conditions. The high pressure control is specifically geared towards managing and ensuring the system does not operate under exceptionally high stress, marking it as a primary safety control for protecting both the equipment and the environment.