How many sets of NC contacts are shown in Equipment IV?

The answer identifies that there is one set of normally closed (NC) contacts shown in Equipment IV. In electrical terminology, normally closed contacts are switch contacts that are closed by default, allowing current to flow through the circuit when the switch is not activated.

In equipment diagrams or schematics, these contacts are typically labeled or represented in a specific manner, allowing technicians and engineers to easily distinguish between normally open (NO) and normally closed contacts. Identifying the presence of NC contacts is crucial for understanding the circuit's operation, as these contacts play a significant role in controlling the flow of electricity and potentially in safety mechanisms within the equipment.

Recognizing that only one set of NC contacts exists reflects the design and function of Equipment IV, which may have been tailored for a specific purpose that necessitates a single set of NC contacts for optimal performance or safety. Understanding this aspect helps in troubleshooting and ensuring the equipment operates correctly according to its intended use.