Mike Dolt Enterprises
Mike Dolt Enterprises
User: ohmhead, Location: ORLANDO FLA
Asked on: Thursday, April 21, 2011 at 6:04 pm EDT
Answered on: Tuesday, May 14, 2024 at 4:30 am EDT
Question: Question GEC we normally bond the metal raceway at each end with a bonding bushing and attach it to the bonding bushing .Why do we do this for what reason ?Next can the grounding electrode conductor effect in any way under any condition the trip time of breaker under a fault condition any type of fault phase to phase or ground to phase or phase to neutral you pick the one ?What would be the longest GEC allowed ? Meaning length or distance from service would distance effect its intended use ?Thanks
Why we bond metal raceway to bonding bushing
Metal raceways provide a conductive path for fault currents to flow back to the service panel and trip the circuit breaker. Bonding the raceways to the bonding bushing ensures a low-resistance path for this current to follow, minimizing the risk of electrical shock or fire.
Effect of the grounding electrode conductor on breaker trip time
The grounding electrode conductor (GEC) does not affect the trip time of the circuit breaker under any fault condition. The GEC is designed to provide a low-resistance path for fault currents to flow to the ground, but it does not provide a current path for the fault current that trips the breaker.
Maximum allowed length of the GEC
The maximum allowed length of the GEC varies depending on the size of the conductor and the type of grounding electrode it is connected to. In general, the GEC should be as short as possible, but the following maximum lengths are typically used: For a 8 AWG copper conductor: 100 feet For a 6 AWG copper conductor: 150 feet* For a 4 AWG copper conductor: 200 feet
Effect of distance from the service on the GEC:
The distance from the service does not affect the intended use of the GEC. As long as the GEC is properly sized and connected to an appropriate grounding electrode, it will provide a low-resistance path for fault currents to flow to the ground. Flag for review