Master Electrician Practice Exam

What is the maximum allowable length for liquid-tight flexible metal conduit (LFMC) as an equipment grounding conductor?

1. 8 feet

2. 6 feet

3. 10 feet

4. 5 feet

The correct answer is: 6 feet

The correct answer is based on safety and regulatory guidelines governing the use of liquid-tight flexible metal conduit (LFMC). According to the National Electrical Code (NEC), LFMC can be utilized for grounding purposes, but there are limitations on its length to ensure safety and effectiveness in electrical systems. The maximum allowable length of LFMC when used as an equipment grounding conductor is 6 feet. This limitation is in place to reduce the potential for voltage drop and ensure that grounding systems function properly to protect against fault currents, which can pose hazards. Longer lengths could introduce a greater risk of resistance, which might impede the effective grounding of electrical equipment. This regulation is designed to ensure that the equipment is properly grounded, minimizing risks of electrical shock and equipment damage. Understanding these limitations helps electricians ensure compliance with electrical codes and maintain safety standards.