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Enclosure: NEMA 1, surface type in dry locations. Use NEMA-3R for exterior <br />locations. <br />Ratings: Voltage, ampacity, horsepower and inductive ratings complying with <br />power source voltage and characteristics of load controlled. <br />Mechanism: Heavy-duty, quick-make, quick-break, with voidable interlock to <br />prevent opening enclosure in "ON" position. External lockable handle operation <br />with provision for not less than two padlocks. <br />Poles and fusing: Comply with load requirements. Provide fused switches <br />where fusing is indicated or required to comply with Code and equipment <br />requirements. Where fuses are installed, use dual-element fuses. <br /> <br />Provide power disconnect switches which shall be manufactured by Siemens- <br />Westinghouse, General Electric, or Square D. <br /> <br />Provide the number of poles necessary to include a pole for each ungrounded <br />conductor. Equip switch with neutral terminal point where neutral is present. Do not <br />switch neutral unless indicated. <br /> <br />2.18.1 TRANSFORMERS - DRY TYPE <br /> <br />A. Products: <br /> <br />2. <br /> <br />3. <br /> <br />4. <br /> <br />5. <br /> <br />6. <br /> <br />This Specification is for dry type, encapsulated, self-cooled, enclosed <br />transformers for the two winding type. Impedance shall be NEMA standard. <br />Supply transformers with copper windings of capacity and voltage ratings as <br />indicated, built to IEEE, ANSI and NEMA standards. <br />Equip with NEMA standard taps. If taps are not standard, equip transformer <br />with two 2-1/2% FCAN and two 2-1/2% FCBN taps. <br />Where neutral connection is indicated, attach to bolt and lug inside enclosure and <br />extend bolt through enclosure to permit external ground cormectJon. <br />Equip transformers with vibration dampers (Korfund Company or equivalent) <br />separating core and coil assembly from the structural members of the enclosure. <br />Provide transformers with Class H insulation having a temperature rise above a <br />40 degrees C ambient, when operating at full load, not to exceed: <br />a. Class H, 80 degrees C: 9KVA and above. <br /> <br />Construction enclosures shall be a separate compartment supplied with <br />panelboard where indicated on the drawings; of heavy gauge sheet steel, primed <br />inside and out with zinc chromate or iron oxide rust-inhibiting primer. Finish <br />with a gray enamel. Use manufacturer's standard gray color unless a particular <br />ASA color is indicated or specified. Locate terminal compartment below the <br />level of the transformer windings. Provide access to terminals from front for <br /> <br />Basic Materials and Methods 16050-14 <br /> <br /> <br />