Specifications - City of Montpelier, Vermont

Title:Montpelier District Heating16470 $ PanelboardsCity of Montpelier, VTIssue Date:September 28, 2012Page #:12 of 17c. Provide one (1) continuous bus bar per phase. Each bus bar shallhave sequentially phased branch circuit connectors suitable forplugon or bolton branch circuit breakers. The bussing shall befully rated. Panelboard bus current ratings shall be determined byheatrise tests conducted in accordance with UL 67. Bussing shallbe copper. Panelboards shall be suitable for use as ServiceEquipment when application requirements comply with UL 67 andNEC Articles 230F and G.d. All currentcarrying parts shall be insulated from ground andphasetophase by Noryl high dielectric strength thermoplastic orequivalent.e. Split solid neutral shall be plated and located in the mainscompartment up to 250 amperes so all incoming neutral cable maybe of the same length. [UL Listed panelboards with 200% ratedsolid neutral shall be plated copper for nonlinear loadapplications. Panelboards shall be marked for nonlinear loadapplications].f. Interior trim shall be of deadfront construction to shield user fromenergized parts. Deadfront trim shall have preformed twistoutscovering unused mounting space.g. Nameplates shall contain system information and catalog numberor factory order number. Interior wiring diagram, neutral wiringdiagram, UL Listed label and short circuit current rating shall bedisplayed on the interior or in a booklet format.h. Interiors shall be field convertible for top or bottom incoming feed.Main and subfeed circuit breakers shall be vertically mounted.Main lug interiors up to 400 amperes shall be field convertible tomain breaker. Interior leveling provisions shall be provided forflush mounted applications.2. Main Circuit Breakera. Main circuit breakers shall have an overcenter, tripfree, togglemechanism which will provide quickmake, quickbreak contactaction. Circuit breakers shall have a permanent trip unit withthermal and magnetic trip elements in each pole. Each thermalelement shall be true rms sensing and be factory calibrated toPANELBOARDS 16470 12