Probable Effect Concentration Quotients (PECQS) Practice Test

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What is the requirement regarding automatic cutouts in a premises wiring system?

They may disconnect partial energy sources
They must disconnect all sources of energy
They can operate only at specified voltages
They should connect to auxiliary equipment

The correct answer is: They must disconnect all sources of energy

The requirement regarding automatic cutouts in a premises wiring system is that they must disconnect all sources of energy. This ensures safety by effectively isolating the electrical supply in the event of an overload, short circuit, or other fault conditions. By disconnecting all sources, the likelihood of electric shock or fire hazards is significantly reduced, as it ensures that no live power is present in the circuits and equipment when maintenance or repairs are being conducted. This comprehensive disconnection is crucial in safeguarding individuals working on or near the electrical system and minimizing risks associated with electrical faults. The other options do not adequately fulfill the safety and operational requirements typically set for automatic cutouts. For instance, disconnecting only partial energy sources does not provide complete safety and may still leave circuits energized, while operating only at specified voltages could introduce risks if not all voltage levels are accounted for in an installation. Lastly, while connecting to auxiliary equipment may be useful in certain contexts, it does not address the primary safety concern of completely disconnecting energy sources.