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ANSI C136.21 2014 Edition, January 1, 2014
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Roadway and Area Lighting Equipment - Vertical Tenons Used with Post Top–mounted Luminaires
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ANSI/NEMA MW 1000, 2014
This standard covers the attachment features of vertical tenons on pole tops or brackets used in roadway and area lighting that permit the interchangeability of post-top–mounted luminaires.