58 Modern Commercial Wiring Copyright Goodheart-Willcox Co., Inc. There are many nationally recognized testing laboratories: • Underwriters Laboratories (UL) • Factory Mutual Research (FM) • United States Testing Company (UST) • Canadian Standards Association (CSA). A product is listed only for its intended pur- pose and should be used only for its intended application. Also, just because one component of a piece of equipment is listed does not mean the entire item meets standards. Be sure each component and the entire unit meet the mini- mum standard for safety. For example, a listed appliance cord does not mean the appliance itself is listed. Check the equipment to see if it has been listed as well. 4.3.3 Other Standards There are other agencies that set standards used by the electrical industry. These organizations often help amend, enhance, and contribute to the NEC. Individuals representing these orga- nizations are usually part of the committees that review and modify Code sections. These organizations include the following: • National Electrical Manufacturers Association (NEMA) • National Electrical Contractors Association (NECA) • International Association of Electrical Inspectors (IAEI) • International Brotherhood of Electrical Workers (IBEW) • Institute of Electrical and Electronics Engineers (IEEE) • American National Standards Institute (ANSI) • Illuminating Engineering Society of North America (IESNA). Summary • Symbols and abbreviations are used on drawings to represent the type, size, and style of equipment to be installed. • The most common types of electrical drawings are electrical plans, schematic diagrams, single-line drawings, and schedules. • Specifi cations are a written detailed description of the project requirements. • Building code requirements make a building safer in the event of natural disasters, preventing injury and loss of life. • The National Electric Code governs nearly all electrical construction performed in the United States. • The Code is divided into chapters, articles, parts, sections, and then subsections to help organize topics and help users locate a specifi c item. • Electrical equipment and material are inspected and tested by recognized organizations, such as the Underwriter Laboratories (UL), Factory Mutual Research (FM), United States Testing Company (UST), and Canadian Standards Association (CSA).