Distance between grounding on buried cable must not exceed 305 meters (1001 feet).

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Multiple Choice

Distance between grounding on buried cable must not exceed 305 meters (1001 feet).

The key idea here is maintaining a low-impedance, continuous bonding path to earth along a buried cable run. When a fault occurs or there’s a lightning surge, the grounding system needs to carry fault current and keep equipment at or near earth potential. If the distance between grounding points is too long, the impedance of the grounding path increases, which can allow dangerous voltages to appear on the cable and its shielding and can delay the operation of protective devices. Setting a maximum spacing of 305 meters (1001 feet) ensures the grounding path remains effective throughout the route, providing safety and reliable fault clearing. The other options would either require unnecessary extra grounding work (too close) or risk high impedance and inadequate protection (too far apart).

The key idea here is maintaining a low-impedance, continuous bonding path to earth along a buried cable run. When a fault occurs or there’s a lightning surge, the grounding system needs to carry fault current and keep equipment at or near earth potential. If the distance between grounding points is too long, the impedance of the grounding path increases, which can allow dangerous voltages to appear on the cable and its shielding and can delay the operation of protective devices.

Setting a maximum spacing of 305 meters (1001 feet) ensures the grounding path remains effective throughout the route, providing safety and reliable fault clearing. The other options would either require unnecessary extra grounding work (too close) or risk high impedance and inadequate protection (too far apart).

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