Journeyman Electrician Practice Exam

Which wiring methods are approved for use for fixed wiring in an area above Class I locations in a commercial repair garage?

1. Type MC cable

2. Type AC cable

3. Type MI cable

4. All of the above

The correct answer is: All of the above

All the wiring methods listed—Type MC cable, Type AC cable, and Type MI cable—are suitable for use in fixed wiring applications in areas above Class I locations in a commercial repair garage. Type MC (Metal Clad) cable is designed for use in locations where a durable and flexible installation is required. It can withstand exposure to moisture and mechanical damage, making it appropriate for commercial environments. Type AC (Armored Cable) offers protection from physical damage and has been used traditionally in commercial and industrial settings, providing suitable insulation and mechanical protection for electrical conductors. Type MI (Mineral Insulated) cable is known for its resistance to heat and humidity, making it an excellent choice in environments where exposure to severe conditions is anticipated. It can also handle high temperatures and has a very long lifespan. The allowance for all these types of cables enables electricians to choose the most appropriate method based on specific installation criteria, site conditions, and regulatory requirements. This flexibility ensures compliance with codes while providing effective solutions for electrical installations in commercial repair garages.