What material is provided in the NFPA 70E as non-enforceable notes for guidance?

The correct choice reflects the concept that explanatory notes in NFPA 70E serve as non-enforceable guidance. These notes are intended to provide additional context and clarity to the standards within the document. They help to explain the intent behind certain requirements or suggest best practices without establishing mandatory obligations. This makes them a valuable resource for understanding how to apply the standards effectively in real-world scenarios.

The other options, such as recommendations, may imply suggestions that could be followed but do not specifically denote the non-enforceable nature that explanatory notes possess. Mandatory guidelines clearly indicate enforceable requirements that must be followed, while appendices typically contain supplementary information or additional details to support the main text, rather than serving as a source of non-enforceable guidance. Thus, explanatory notes are specifically designed to guide users in a manner that is educational rather than obligatory.