Specifications - City of Montpelier, Vermont

Title:Montpelier District HeatingCity of Montpelier, VT15030 – Electrical Requirements for Mechanical EquipmentIssue Date:September 28, 2012Page #:5 of 67. Nameplate: Indicate the full identification of manufacturer, ratings,characteristics, construction, special features, nominal full load motorefficiency and similar information.2.2 STARTERS, ELECTRICAL DEVICES, AND WIRINGA. General: Except as otherwise indicated, provide motor controllers and ancillarycomponents which comply with the manufacturer’s standard materials, design,and construction in accordance with published product information, and asrequired for a complete installation.B. Combination Magnetic Starters: Full voltage nonreversing type with circuitprotective device. Circuit protective devices shall be molded case motor circuitprotector breakers for motors sized up to 10 horsepower, and fusible disconnectswitches for motors sized larger than 10 horsepower. Circuit protective devicesshall be rated for approximately 175% of the motor full load amperage. Fusesshall be dual element time delay type. Molded case circuit breakers shall havesymmetrical interrupting capacity, rating to accommodate available short circuitcurrent of the electrical system. Starters shall be 60 Hertz, be mounted in aNEMA rated enclosure suitable for the environment in which it is located, sizedproperly for the motor horsepower, voltage, and phasing. Minimum size shall beNEMA size 1. All starters shall be sized in accordance with the National ElectricCode.C. Magnetic Starters: Starters shall be 60 Hertz, be mounted in a NEMA ratedenclosure suitable for the environment in which it is located, sized properly forthe motor horsepower, voltage, and phasing. Minimum size shall be NEMA size1. All starters shall be sized in accordance with the National Electric Code.D. Provide magnetic starters with fused 120 volt control circuits and auxiliarycontacts. Minimum size control transformers shall be 100VA. Provide eachmagnetic starter with auxiliary contacts, two normally open (NO) and twonormally closed (NC). Furnish all combination starters with HandOffAuto(HOA) switches and red pilot ‘ON’ lights. Bimetallic, isothermic type ambientcompensated overload and relay shall be provided in each leg of the starters.Overload relays shall be NEMA Class 20 and sized so that their thermalcharacteristics closely parallel the motor thermal characteristics as determinedfrom the motor nameplate. Overload relays shall be hand reset from the outsideof the starter enclosure by an insulated reset button.ELECTRICAL REQUIREMENTS FOR MECHANICAL EQUIPMENT150305