Specifications - City of Montpelier, Vermont

Title:Montpelier District HeatingCity of Montpelier, VT16170 – Circuit and Motor DisconnectsIssue Date:September 28, 2012Page #:2 of 31. Allen Bradley/Rockwell Automation2. ABB3. CrouseHinds/Cooper Industries4. CutlerHammer/Eaton Corp.5. General Electric Co.6. Siemens Energy & Automation Inc.7. Square D Company2.2 CIRCUIT AND MOTOR DISCONNECT SWITCHESA. General: Provide circuit and motor disconnect switches in types, sizes, duties,features ratings, and enclosures as indicated. Provide NEMA 1 enclosure exceptfor outdoor switches, and other indicated locations provide NEMA 3R enclosureswith raintight hubs. For motor and motor starter disconnects, provide units withhorsepower ratings suitable to the loads.B. Switches shall have quickmake, quickbreak operating mechanism and handlewhich shall be an integral part of the box and not the cover. Covers shall havedual interlocks to prevent unauthorized opening of the cover with the switch inthe "ON" position or closing of the switching mechanism with the cover open.C. Switches shall have switch blades visible in the "OFF" position when the cover isopen. Disconnect switches shall have permanently attached arc suppressorshinged or otherwise attached to permit easy access to the line side lugs withoutremoval of the arc suppressors.D. Switches shall have provisions for padlocking in the "OFF" position only, withthree padlock.E. Switch cable lugs shall be U.L. approved for copper and aluminum cables. Allcurrent carrying parts shall be plated by electrolytic process.F. Switch enclosures shall be code gauge steel with rust inhibiting phosphate primerand baked enamel finish.G. Fusible Switches: heavy duty switches, with fuses of classes and current ratingsindicated. Where current limiting fuses are indicated, provide switches withnoninterchangeable feature suitable only for current limiting type fuses.H. Nonfusible Disconnects: heavy duty switches of classes and current ratings asindicated.CIRCUIT AND MOTOR DISCONNECTS161702