Probable Effect Concentration Quotients (PECQS) Practice Test

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What should an isolating switch do if it is associated with removable equipment?

Ensure equipment is charged
Provide immediate circuit access
Soften circuit overloads
Disconnect the circuit automatically

The correct answer is: Disconnect the circuit automatically

An isolating switch associated with removable equipment is designed primarily for safety and to ensure that the equipment can be safely removed from the circuit. When the switch disconnects the circuit, it prevents any electrical supply from reaching the equipment, reducing the risk of electric shock or short circuits while the equipment is being handled or serviced. The functionality of the isolating switch in this context is critical; it needs to provide a definitive disconnection from the power source before any maintenance or replacement can occur. This ensures that personnel working on the removable equipment can do so without the risk of electrocution or equipment damage due to live circuits. In contrast, ensuring the equipment is charged, providing immediate circuit access, or softening circuit overloads does not align with the primary purpose of the isolating switch related to removable equipment. These roles focus on functionality during operation rather than safety during maintenance, thus illustrating why the disconnect feature is crucial in these scenarios.