Chapter 4 Electrical Prints, Specifi cations, and Codes 57 Copyright Goodheart-Willcox Co., Inc. In general, exceptions reverse, modify, or eliminate a requirement under specifi c condi- tions. The informational notes serve to elabo- rate, enhance, and explain a Code section. Signifi cant Code Terms Article 100 of the Code defi nes key terms. These defi nitions should be carefully studied. Some important terms include the following: • Approved—Acceptable to the authority having jurisdiction. • Labeled—Has an attached label of an organization that is the authority having jurisdiction with product evaluation and by whose labeling the manufacturer indicates compliance with appropriate standards or performance. • Listed—A product or service that either meets appropriate designated standards or has been tested and found suitable for a specifi ed purpose and are included in a list CODE ALERT Types of NEC Information According to Section 90.5, mandatory rules are indicated by the use of the terms shall or shall not. Permissive rules are characterized by the use of the terms shall be permitted or shall not be permitted. Explanatory material is indicated by informational notes. published by an organization that is the authority having jurisdiction. 4.3.2 OSHA Standards The Occupational Safety and Health Administration (OSHA) under Subpart S, Part 1910 of the Code of Federal Regulations provides “Safety Standards for Electrical Sys- tems.” This is a legal document derived from the National Electrical Code. The purpose of OSHA’s electrical document is to provide a standard that secures a high degree of safety for workers by regulating the use of electrical equipment. Unlike the Code, OSHA’s standard relates only to personnel safety. It is not a standard for design and installation. The requirements in OSHA’s regulations are applicable to all electrical installations and sys- tems. Violations of these rules are cause for cita- tion and fi nes. Everyone involved in electrical design and installation—particularly in com- mercial or industrial areas—must understand the OSHA standard. As part of the electrical standard, OSHA requires that electrical equipment and mate- rials be listed, labeled, accepted, or certifi ed, providing that such equipment is available. A nonlisted, nonlabeled, noncertifi ed com- ponent may be used only if it is in a class not tested by a nationally recognized testing labo- ratory. Should that be the case, then the object must be inspected and tested by a recognized organization. Informational note Exception 640.10 Audio Systems Near Bodies of Water. Audio systems near bodies of water, either natural or artificial, shall be subject to the restrictions specified in 640.10(A) and (B). Exception: This section does not include audio systems intended for use on boats, yachts, or other forms of land or water transportation used near bodies of water, whether or not supplied by branch-circuit power. Informational Note: See 680.27(A) for installation of underwa- ter audio equipment. Reproduced with permission of NFPA from NFPA 70, National Electrical Code, 2020 editon. Copyright © 2019, National Fire Protection Association. For a full copy of the NFPA 70, please go to www.nfpa.org Figure 4-18. This Code section specifi es that audio systems near water must meet additional requirements. The exception excludes systems designed for use on boats. The informational note references information for underwater audio equipment.