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i <br /> i <br /> 4. The power distribution panel shall be completely assembled, wired, adjusted and <br /> tested at the factory. After assembly, the complete distribution switchboard will be <br /> tested for operation under simulated service conditions to assure the accuracy of the <br /> wiring and the functioning of all equipment. The distribution bus shall be given a <br /> dielectric test of 2200 volts for one minute between live parts and ground and between <br /> opposite polarities. The wiring and control circuits shall be given a dielectric test of <br /> 1500 volts for one minute between live parts and ground. A certified test report of <br /> all standard production test shall be available to the Engineer upon request. <br /> C. Short Circuit Rating <br /> 1. The complete bus assembly and breakers shall be rated to withstand mechanical forces <br /> I exerted during short circuit conditions when connected directly to a power source <br /> having available fault current of 22,000 amperes symmetrical at rated 480 volts. <br /> D. Bussing <br /> ' 1. All bus bars shall be tin plated copper. Bus sizing shall be based on NEMA standard <br /> temperature rise criteria of 65 degrees C over a 40 degrees C ambient (outside the <br /> enclosure). <br /> 2. A copper ground bus shall be furnished firmly secured to each vertical section <br /> structure and shall extend the entire length of the distribution switchgear. <br /> 3. All hardware used on conductors shall be high-tensile strength and zinc plated. All <br /> bus joints shall be provided with bellville washers. <br /> E. Distribution Breakers <br /> 1. The protective devices shall be molded case breakers with 22,000 amp minimum <br /> interrupting ratings and trip ratings as shown on the Contract one-line drawings. <br /> 2. Each breaker shall have a hasp for padlocking the breaker in the OFF position. <br /> iELECTRICAL <br /> 16000 - 37 <br />