NEC Commercial Electrical Practice Test

What is the maximum length of equipment bonding jumpers installed outside of a raceway?

1. 4 feet

2. 6 feet

3. 8 feet

4. 10 feet

The correct answer is: 6 feet

The maximum length of equipment bonding jumpers installed outside of a raceway is determined by the National Electrical Code (NEC) requirements, specifically referenced in Article 250. The code specifies that the length of equipment bonding jumpers should not exceed 6 feet when they are installed outside of a raceway. This restriction ensures effective grounding and bonding of electrical equipment, minimizing the risk of electrical shock or fire hazards that could arise if improperly bonded. The 6-foot limit facilitates a more manageable installation that can maintain the integrity and effectiveness of the grounding system. Longer bonding jumpers may increase the potential for inductance and resistance that can hinder the effectiveness of the bonding connection. Thus, when considering the length for equipment bonding jumpers, adhering to the 6-foot maximum requirement is essential for compliance with the NEC and ensuring safe electrical installations.