Which practice helps minimize shock risk by ensuring a low-impedance path for fault current in a control system?

Which practice helps minimize shock risk by ensuring a low-impedance path for fault current in a control system?

• A. Isolating all grounds.
• B. Continuous bonding throughout the system.
• C. Using only plastic enclosures.
• D. Removing all test points.

Answer: (B)

Continuous bonding throughout the system keeps all conductive metal parts at the same electrical potential and provides a low-impedance path for fault current. When a fault occurs, the current has a ready route back to the source through the bonding network, so protective devices trip quickly and the voltage a person could touch between metal surfaces and earth stays very small. This rapid fault clearing and low touch voltage is what minimizes shock risk in a control system. Isolating all grounds would remove that shared path and create dangerous voltage differences; plastic enclosures remove conductive paths entirely and don’t aid fault current flow; removing test points doesn’t address bonding and can reduce system safety.

Continuous bonding throughout the system keeps all conductive metal parts at the same electrical potential and provides a low-impedance path for fault current. When a fault occurs, the current has a ready route back to the source through the bonding network, so protective devices trip quickly and the voltage a person could touch between metal surfaces and earth stays very small. This rapid fault clearing and low touch voltage is what minimizes shock risk in a control system. Isolating all grounds would remove that shared path and create dangerous voltage differences; plastic enclosures remove conductive paths entirely and don’t aid fault current flow; removing test points doesn’t address bonding and can reduce system safety.