IEEE Y32.9-1972 - American National Standard Graphic Symbols for Electrical Wiring and Layout Diagrams Used in Architecture and Building Construction
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This standard is a revision of American National Standard Y32.9-1962. It also supersedes the military standard MILSTD-15-3, 30 October 1961. The format has been modified and minor changes have been made in the symbols in order to coordinate the industry and military standards. Appendix A shows revised and deleted symbols from both predecessor documents.
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