specifications - FAACO - Federal Aviation Administration Contract ...

FTWIC-2235June 2009drawings, the panelboard shall be equipped with bus connections for the futureinstallation of circuit breakers.F. MOLDED CASE CIRCUIT BREAKERS: Circuit breaker interrupting rating shall be42K RMS symmetrical amperes at 480 VAC. Circuit breakers shall be constructed usingreinforced insulating material providing high dielectric strength. The circuit breaker shallhave quick-make, quick-break contacts with an over center operating mechanism.Current carrying components shall be isolated from the trip system and field installedaccessories. Breakers shall provide common tripping of all poles and shall be trip free.Circuit breaker handle accessories shall provide provisions for locking the handle in theOFF position. Lugs shall be UL Listed to accept solid or stranded copper and aluminumconductors. Lugs shall be suitable for 75° C rated wire and 90° C rated wire, sizedaccording to the 75° C temperature rating per NEC Table 310-16. The circuit breakershall be UL listed for reverse connection.1. Thermal Magnetic: Ampere ratings shall be as shown on the drawings. Circuitbreakers shall have a permanent trip unit with thermal and magnetic trip elementsin each pole. Thermal elements shall be factory calibrated to operate in a 40° Cambient environment. Two- and three-pole circuit breakers shall have an internalcommon trip crossbar to provide simultaneous tripping.2. Electronic Trip: Ampere ratings shall be as shown on the drawings. The ampererating shall be determined by the combination of the interchangeable rating plugand the frame/sensor size of the breaker. The ampere rating resulting from theframe/rating plug combination shall be clearly marked on the front of thebreaker. The circuit breakers shall have true RMS sensing. The integral systemshall operate independently of any external power source and shall containelectronic components to measure and time the output from internal currentsensors and initiate tripping action. The trip unit shall be factory installed andfield upgradeable. The rating plug shall be factory installed and fieldreplaceable. UL listing shall be retained when rating plug is field replaced. Thebreaker shall be provided with the means to seal the trip unit, and trip functionadjustment dials to discourage tampering once the breaker is in service. Providethe following time/current profile adjustments to maximize system selectivecoordination. Each adjustment shall have discreet settings and shall beindependent from all other adjustments:Adjustable Long Time Pickup and DelayAdjustable Short Time Pickup and Delay includes I 2 T IN & OUTAdjustable Instantaneous Pickup with OFF position16163-3