In the context of NEC application, how does the term "shall" differ from "may"?

In the context of the National Electrical Code (NEC) application, "shall" and "may" have distinct meanings that are crucial for understanding compliance. "Shall" indicates a requirement that must be followed, establishing something that is mandatory according to the code. This means that if a provision states that something "shall" be done, it is not optional; adherence is necessary for compliance.

On the other hand, "may" provides permission or an allowance. When the code states that something "may" be done, it indicates an option available to the electrician or designer; it is not an obligation. This distinction helps clarify which parts of the code are enforceable and which are permissive, guiding professionals in their applications of the code effectively. Understanding this difference is vital to ensuring that electrical installations adhere to safety and regulatory standards.