How shall cable couplers be constructed?

The construction of cable couplers is critical for ensuring safety and reliability in electrical systems. The correct answer highlights the necessity that the ground check continuity conductor should break first during disconnection. This is important for safety reasons because it ensures that any potential faults or hazardous voltages are isolated before the power supply is interrupted. By ensuring that the ground connection is broken first, it minimizes the risk of electric shock or equipment damage when the coupler is disconnected.

When couplers are designed with this feature, they enhance the safety of maintenance work and any other activities involving electrical equipment, as they prevent live circuits while grounding is still connected. This design consideration is fundamentally about protecting both the personnel who interact with the equipment and the integrity of the electrical system.

Other aspects, like being waterproof or allowing for quick disconnection, are important features but do not address the critical safety aspect related to electrical grounding that impacts operational safety. Supporting maximum voltage is also significant, yet it is more about the capability of the equipment rather than a safety measure in the disconnection process. Thus, the first-to-break principle concerning the ground check continuity conductor is a prioritized safety measure in cable coupler construction.