Which standard covers conductor sizing, protective devices, and short-circuit protection for electrical installations?

Which standard covers conductor sizing, protective devices, and short-circuit protection for electrical installations?

• A. NFPA 72
• B. NEC/NFPA 70
• C. NFPA 101
• D. NFPA 13

Answer: (B)

The concept being tested is which standard governs the design and installation of electrical systems, including how conductors are sized and how protective devices and short-circuit protection are applied. The applicable standard is the NEC, also known as NFPA 70. It provides the rules for determining conductor ampacity, choosing appropriate overcurrent protection (such as fuses and circuit breakers), and sizing protection to safely handle short-circuit currents. It also covers coordination of protective devices and other details needed to ensure a safe, code-compliant installation. This code is the primary reference for electrical installations, inspections, and permitting in many jurisdictions, which is why it’s the best answer. The other standards focus on different areas: NFPA 72 deals with fire alarm systems, NFPA 101 is a Life Safety Code for building occupancy and egress, and NFPA 13 covers automatic fire sprinkler systems; none of these govern general conductor sizing or overcurrent protection for electrical installations.

The concept being tested is which standard governs the design and installation of electrical systems, including how conductors are sized and how protective devices and short-circuit protection are applied. The applicable standard is the NEC, also known as NFPA 70. It provides the rules for determining conductor ampacity, choosing appropriate overcurrent protection (such as fuses and circuit breakers), and sizing protection to safely handle short-circuit currents. It also covers coordination of protective devices and other details needed to ensure a safe, code-compliant installation. This code is the primary reference for electrical installations, inspections, and permitting in many jurisdictions, which is why it’s the best answer. The other standards focus on different areas: NFPA 72 deals with fire alarm systems, NFPA 101 is a Life Safety Code for building occupancy and egress, and NFPA 13 covers automatic fire sprinkler systems; none of these govern general conductor sizing or overcurrent protection for electrical installations.