Orange County NC Website
Browse       Search
ORANGE COUNTY 262816-2 <br /> <br />Emergency Management Warehouse Building Dehumidification Enclosed Switches and Circuit Breakers <br /> <br /> <br /> <br />PART 2 - PRODUCTS 1 <br /> 2 <br /> 3 <br />FABRICATED SWITCHES 4 <br /> 5 <br />Safety Switches: Provide surface-mounted, heavy duty, steel enclosed safety switches, of types, voltage rating, 6 <br />current rating, and number of poles indicated on the Drawings. 7 <br /> 8 <br />Switches with no drawing indication of number of poles are three pole types. Switches shall be fusible type, rated as 9 <br />follows unless otherwise specified: 10 <br /> 11 <br />For 208Y/120 V.: Use 250 Volt type, with neutral and grounding bus. 12 <br /> 13 <br />Provide internally mounted, insulated, neutral bus suitable for copper conductors. Provide separate equipment 14 <br />grounding bus, bonded to the enclosure and marked for use as a grounding bus. 15 <br /> 16 <br />Provide horsepower rated switches incorporating quick-make, quick-break type switches constructed so that switch 17 <br />blades are visible in OFF position with door open. Equip with operating handle which is integral part of enclosure 18 <br />base and whose operating position is easily recognizable. Internal current carrying components shall be 19 <br />high-conductivity copper; switch contacts shall be silver-tungsten type. Fuse holders shall have positive pressure 20 <br />type reinforced fuse clips. Where non-fused disconnect switches are indicated, provide solid copper bus bars in lieu 21 <br />of fuses. 22 <br /> 23 <br />Provide NEMA Type 1 enclosure unless otherwise indicated on the Drawings; provide NEMA Type 3R enclosure 24 <br />where the Drawings indicate weatherproof. Other enclosure types shall be furnished if specifically indicated on the 25 <br />Drawings. 26 <br /> 27 <br />Provide switches that may be locked in either the “ON’ or ‘OFF’ condition with a 1/4" shackle hasp-type lock. 28 <br />Safety switches shall have door interlocks that prevent the door from opening when the operating handle of 29 <br />the switch is in the “on” position. Manual defeat mechanisms shall be provided for the interlocks. 30 <br /> 31 <br />Provide two-pole interlock switches for all disconnects that are used with utilization equipment requiring control 32 <br />connections provided under other divisions. The interlock switch is to be configured such that when the disconnect is 33 <br />open the interlock switch is open. 34 <br /> 35 <br />Provide additional interlock switches, auxiliary contacts, mechanical key interlocks, or other accessories as 36 <br />may be described by the Drawings. 37 <br /> 38 <br />Fuses: Provide fuses for safety switches of classes, types, and ratings needed to fulfill electrical requirements of 39 <br />Divisions 26-28 supplied utilization equipment served by the safety switch. Dual element fuses shall be cartridge type 40 <br />with ferrule contact or knife-blade contact type as appropriate. 41 <br /> 42 <br />Fuses for equipment supplied by other divisions are to be furnished and installed by the division supplying 43 <br />the equipment. 44 <br /> 45 <br />Fuses are not to be installed by this contractor unless the equipment served by the disconnect is furnished under 46 <br />Divisions 26-28. 47 <br /> 48 <br /> 49 <br />PART 3 - EXECUTION 50 <br /> 51 <br /> 52 <br />INSTALLATION OF ENCLOSED SWITCHES AND CIRCUIT BREAKERS 53 <br /> 54 <br />Install electrical switches and circuit breakers as indicated, complying with manufacturer's written instructions, 55 <br />applicable requirements of NEC, NEMA, and NECA's "Standard of Installation," and in accordance with recognized 56 <br />industry practices. 57 <br /> 58 <br /> 59 <br /> 60 <br />DocuSign Envelope ID: 7668B866-6C26-485C-9A45-DAAB5D4BD951