Is it true that primary power should never be unswitched?

• A. True
• B. False
• C. It depends on the system
• D. Only in certain applications

Answer: (B)

The assertion that primary power should never be unswitched is considered false because there are situations in which it is acceptable or beneficial to have unswitched primary power. In some systems, continuous power is necessary for critical operations, such as maintaining the status of essential equipment or ensuring that safety systems remain operational at all times.

For instance, in industrial settings, primary power could be unswitched as part of a safety protocol to ensure that machinery can operate under a predetermined safety regime without interruption. Additionally, certain types of equipment, like emergency lighting or fire alarms, may need to be powered at all times to guarantee reliable function during emergencies.

In other instances, systems may be designed to isolate primary power during maintenance or troubleshooting, where temporary isolation is necessary for safety. This versatility in application illustrates that there isn’t a universal rule against unswitched primary power; rather, its suitability depends on specific system requirements and safety considerations.