Specifications include, but are not limited to: 2.2 TRANSFORMERS, GENERAL A. Description: 2-winding type, designed for operation with Medium-voltage windings connected to a 3-phase, 60-Hz, Delta primary, and a 3 phase, 4 Wire, Wye secondary distribution system. B. Low-Sound-Level Units: Minimum of 5 dB less than NEMA TR 1 standard sound levels for transformer type and rating. C. Transformers shall be K4-rated. 2.3 DRY-TYPE TRANSFORMERS, Quantity of two. A. 13.8 kV, 3 phase, 60 Hertz Delta Primary with 3 phase, 4 wire 480V grounded Wye Secondary: 1. 750KVA, KVA UL listed, TP1 energy rated, pad-mount, vandal proof, dry type transformer to comply with NEMA ST 20, IEEE C.57.12.01, and IEEE C57.94, and list and label as complying with UL 1562 2. Enclosure: The enclosure shall be tamper proof and of heavy gauge steel. All ventilating openings shall be tamper proof and shall be in accordance with NEMA and the NEC standards for ventilated enclosures. The core shall be visibly grounded to the frame by means of a flexible grounding strap. 3. 80 degree C rise with a 220 degree C insulation system 95 KV BIL rating (accomplished without the use of supplemental arrestors). 4. Six (6) full capacity primary taps, two (2) taps to be 2½% each above and four (4) to be 2½% each below normal primary voltage 5. The transformer windings shall be aluminum and vacuum-pressure impregnated, the encapsulating materials used for the VPI process shall have 100 percent solids content and be epoxy resin (double dipped). 6. The unit shall have provisions for changing the tap settings (when de-energized) by flexible links on the face of each HV coil. 7. Minimum of 5 dB less than NEMA TR 1 standard sound levels for transformer type and rating. 8. Outdoor transformer enclosures shall be finished with UL listed outdoor polyester powder paint, Munsell 7GY3.29/1.5 olive green paint. 9. Factory installed accessories shall include the following: a. Replaceable air filters. b. Lightning arrestors. Rated at 15kv class, 12.7 MCOV. 2.4 LIQUID-FILLED/PAD-MOUNTED TRANSFORMERS A. Due to the environmental issues associated with oil filled transformers, they are not used for new or replacement installations on the Amherst campus. 2.5 FINISHES All exterior transformer enclosures shall be finished with UL listed outdoor polyester powder paint, Munsell 7GY3.29/1.5 olive green paint color. TRANSFORMER PADS Transformer pads shall be fiberglass, 36 inch deep, manufactured to meet transformer requirements for size and weight. Available Manufacturers: Subject to compliance with requirements, manufacturers offering transformers pads that may be incorporated into the Work include, but are not limited to, the following: Nordic Fiberglass Inc. Highline Products Concast Fibercrete