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Acceptable manufacturers are Hoffman, Circle AW, or equal. Floor Boxes: ... 3R, 4 and 12 enclosures. Threaded Locknuts: Sealing type may be used with NEMA 2, 3, 3R, 4 and 12 enclosures at bottom penetrations. Extra-heavy electrogalvanized steel for sizes up to 2 inches. Locknuts larger than 2 inches shall be electrogalvanized malleable iron. ................
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