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ORANGE COUNTY 230511 - 5 <br /> <br />Emergency Management Warehouse Building Dehumidification Electrical Provisions for HVAC Work <br /> <br /> <br />Provide two-pole interlock switches for all disconnects that are used with utilization equipment requiring control 1 <br />connections provided from separate electrical sources. The interlock switch is to be configured such that when the 2 <br />disconnect is open the interlock switch is open. 3 <br /> 4 <br />Provide additional interlock switches, auxiliary contacts, plumbing key interlocks, or other accessories as 5 <br />may be described by the Drawings. 6 <br /> 7 <br />Provide NEMA-rated enclosure type suitable for its environment as required by Section 230511. 8 <br /> 9 <br /> 10 <br />CIRCUIT AND MOTOR DISCONNECTS 11 <br /> 12 <br />Safety Switches: Provide surface-mounted, heavy duty, steel enclosed safety switches, of types, voltage rating, 13 <br />current rating, and number of poles indicated in this Section. 14 <br /> 15 <br />Switches with no drawing indication of number of poles are three pole types. Switches shall be fusible type, rated as 16 <br />follows unless otherwise specified: 17 <br /> 18 <br />For 480Y/277 V.: Use 600 Volt type, with neutral and grounding bus. 19 <br /> 20 <br />For 208Y/120 V.: Use 250 Volt type, with neutral and grounding bus. 21 <br /> 22 <br />For 120/240 V.: Use 250 Volt type, with neutral and grounding bus. 23 <br /> 24 <br />Where a neutral is not provided to the specific utilization equipment served, the neutral bus can be bonded to the 25 <br />enclosure and used as a grounding bus. 26 <br /> 27 <br />Provide horsepower rated switches incorporating quick-make, quick-break type switches constructed so that switch 28 <br />blades are visible in OFF position with door open. Equip with operating handle which is integral part of enclosure 29 <br />base and whose operating position is easily recognizable. Internal current carrying components shall be 30 <br />high-conductivity copper; switch contacts shall be silver-tungsten type. Fuse holders shall have positive pressure 31 <br />type reinforced fuse clips. Where non-fused disconnect switches are indicated, provide solid copper bus bars in lieu 32 <br />of fuses. 33 <br /> 34 <br />Provide NEMA-rated enclosure type suitable for its environment as required by Section 230511. 35 <br /> 36 <br />Provide switches that may be locked in either the “ON’ or ‘OFF’ condition with a 1/4" shackle hasp-type lock. 37 <br /> Safety switches shall have door interlocks that prevent the door from opening when the operating handle of 38 <br />the switch is in the “on” position. Manual defeat mechanisms shall be provided for the interlocks. 39 <br /> 40 <br />Provide two-pole interlock switches for all disconnects that are used with utilization equipment requiring control 41 <br />connections provided from an alternate power source. The interlock switch is to be configured such that when the 42 <br />disconnect is open the interlock switch is open. 43 <br /> 44 <br />Provide additional interlock switches, auxiliary contacts, mechanical key interlocks, or other accessories as 45 <br />described by the Drawings. 46 <br /> 47 <br />For all outdoor equipment, provide a fused weatherproof disconnect switch, sized and fused in accordance with 48 <br />manufacturer's requirements. 49 <br /> 50 <br />Fuses shall be furnished by the Contractor. Fuses shall be current limiting type with a minimum AIC rating of 100,000 51 <br />AMP. The contractor shall furnish Owner with one complete set of spare fuses at the completion of the project. 52 <br /> 53 <br /> 54 <br />55 <br />DocuSign Envelope ID: 7668B866-6C26-485C-9A45-DAAB5D4BD951