Specifications - City of Montpelier, Vermont

Title:Montpelier District Heating16470 $ PanelboardsCity of Montpelier, VTIssue Date:September 28, 2012Page #:13 of 17operate in a 40° C ambient environment. Thermal elements shallbe ambient compensating above 40° C.b. Two and threepole circuit breakers shall have common trippingof all poles. Circuit breakers frame sizes above 100 amperes shallhave a single magnetic trip adjustment located on the front of thebreaker which allows the user to simultaneously select the desiredtrip level of all poles.c. Circuit breaker handle and faceplate shall indicate rated ampacity.Standard construction circuit breakers shall be UL Listed forreverse connection without restrictive line or load markings.d. Circuit breaker escutcheon shall have international I/O markings,in addition to standard ON/OFF markings. Circuit breaker handleaccessories shall provide provisions for locking handle in the ONor OFF position.e. Lugs shall be UL Listed to accept solid or stranded copper andaluminum conductors. Lugs shall be suitable for 90° C rated wire,sized according to the 75° C temperature rating per NEC Table31016. Lug body shall be bolted in place; snapin designs are notacceptable.f. The circuit breakers shall be UL Listed for use with the followingaccessories: Shunt Trip, Under Voltage Trip, Ground Fault ShuntTrip, Auxiliary Switch, Alarm Switch, Mechanical Lug Kits, andCompression Lug Kits.3. Branch Circuit Breakersa. Circuit breakers shall be UL Listed with amperage ratings,interrupting ratings, and number of poles as indicated on thepanelboard schedules.b. Molded case branch circuit breakers shall have bolton type busconnectors.c. Circuit breakers shall have an overcenter toggle mechanism whichwill provide quickmake, quickbreak contact action. Circuitbreakers shall have thermal and magnetic trip elements in eachpole. Two and threepole circuit breakers shall have commonPANELBOARDS 16470 13