What does 'continuous bonding' imply for control circuits?

What does 'continuous bonding' imply for control circuits?

• A. A continuous ground path throughout the system to minimize shock risk and ensure fault current returns.
• B. Isolated grounds at each device.
• C. Grounding only at the power supply.
• D. Grounding only at the end device.

Answer: (A)

Continuous bonding means providing a continuous, low-impedance grounding path that ties all metal enclosures, equipment frames, and conductors back to the source so they share the same electrical potential. In a control circuit, this ensures that if a fault occurs, the fault current has a reliable route back to the supply, causing protective devices to trip quickly and reducing the risk of shock to anyone who might touch exposed surfaces. It also helps keep all metal parts at the same potential, which minimizes dangerous voltage differences and improves noise performance. That’s why the option describing a continuous ground path throughout the system to minimize shock risk and ensure fault current returns is the best fit. Isolated grounds at each device would prevent a single fault from being cleared by a common path. Grounding only at the power supply or only at the end device would not provide a continuous fault-return path across the entire system.

Continuous bonding means providing a continuous, low-impedance grounding path that ties all metal enclosures, equipment frames, and conductors back to the source so they share the same electrical potential. In a control circuit, this ensures that if a fault occurs, the fault current has a reliable route back to the supply, causing protective devices to trip quickly and reducing the risk of shock to anyone who might touch exposed surfaces. It also helps keep all metal parts at the same potential, which minimizes dangerous voltage differences and improves noise performance.

That’s why the option describing a continuous ground path throughout the system to minimize shock risk and ensure fault current returns is the best fit. Isolated grounds at each device would prevent a single fault from being cleared by a common path. Grounding only at the power supply or only at the end device would not provide a continuous fault-return path across the entire system.