What defines the requirements for the physical protection of service conductors?

The correct answer is that NEC Article 230 and relevant parts define the requirements for the physical protection of service conductors. The National Electrical Code (NEC) provides comprehensive guidelines for the installation and maintenance of electrical systems, focusing on safety and efficiency. Article 230 specifically addresses the requirements for service entrance conductors, including their physical protection. This encompasses the necessary measures to prevent damage to the conductors, such as the use of conduits, appropriate installation methods, and clearances from physical hazards.

NEC regulations are extensively referenced in electrical installations to ensure compliance with safety standards. They are more detailed and specific about electrical systems than local regulations, which can vary by jurisdiction. While local regulations may incorporate and enforce local amendments to the NEC or strengthen certain measures, the standard itself is what sets the framework for protecting service conductors.

Manufacturer guidelines provide instructions for specific products but do not define the broad requirements for physical protection as outlined in the NEC. International Electrical Standards may provide useful benchmarks and best practices, but they are not the primary source for U.S. service conductor regulations under the NEC. Thus, NEC Article 230 remains the definitive standard for physical protection requirements of service conductors.