WORK PLANS - Laserfiche WebLink

Home Browse Search

PANELBOARDS Section 16435 15-1207 3. Provisions for future addition of circuit breakers. 4. Bussing and rating of, including neutral and ground. 5. Enclosures: a. Dimension. b. Trim. PART 2 - PRODUCTS 2.1 MATERIALS: A. Panelboards: Eaton, General Electric, Siemens, Square D. 1. Panelboards: Factory -assembled, dead -front, metal encased safety type; construction consisting of structural or formed steel frame carefully braced and welded into rigid structure which shall maintain its alignment and not be damaged in shipment or erection, or by stresses resulting from short circuits. Bolted housing construction with tack -welded joints will be acceptable. Frame: Completely enclosed on rear, top and sides with sheet steel covers, doors and panels, accessible from front. Cabinet: Of sufficient size to conform to both minimum dimensional requirements and minimum wiring gutter requirements of Article 373 CEC (2013). Minimum Cabinet Size: twenty inches (20") wide by five and three-quarters inches (5 3/4") deep. Stationary Portions of Steel Frame and Covers: 12 -gauge minimum with concealed trim clamps. Old style screw fastener type not acceptable. Doors: Sheet metal construction with concealed hinges and equipped with flush type lock and catch. All panels shall be keyed alike. Supply two (2) keys with each lock. Distribution panels installed in outdoor locations shall be free standing in NEMA 3R enclosure. Equipped with heater(s) and thermostat. Heater(s) shall prevent condensation from forming in the inside of the panel. Set thermostat at fifty-five degrees (551) F. 2. Busses: Hard-drawcoppei, ,ii,lety-eight percent (AuB0/v) conductivity, Grade ED, ASTM B230, in accordance with NEMA Standards and as hereinafter specified. 3. Connectors: Silver plated copper. 4. Structure Housing, Bus, and Connections; Construct brace to safely withstand rated short circuit currents in conformance with UL Standard Ui-67. Connections shall be bolted or welded and laminations arranged to provide adequate contact area. All contact surfaces of copper shall be silver-plated. Copper sizes and arrangement shall be such that temperature rise of bus shall not exceed fifty degrees (500) C. with a forty degrees (400) C. ambient outside enclosure. 5. Provide a bare copper neutral bus on insulated bus supports and an uninsulated copper equipment ground bus bar secured to each unit frame, to provide separate, integrated, continuous, neutral and equipment ground buses. Neutral Bus: Same size as associated phase buses for 480/277 volt panels, 200% rated for 208/120 volt panels. Ground Bus: Arranged to ground panelboard's non -current -carrying parts, provided with brazed or approved pressure connector terminations for feeder ground conductors. 6. PanelhnnrA KAnin nnA Rrnnrh Circuit Prntertinn, Rnit-nn typnr mniriie41 race rirrwiit breakers with sizes as shown. Individual panelboards shall be constructed to have short circuit rating consistent with circuit breaker being installed. 7. Circuit Breakers: L