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.comNEHB Circuit Breaker Panelboardswww.ElectricalPartManualsFor 480Y/277V. ac Systems
.comNEHB PanelboardsOur NEHB panelboards, in combinationwith EH (plug-on) or EHB (bolt-on) circuitbreakers provide superior performance forlighting applications, all in a compact 20" wideby 5%" deep design. '. ,anualsMain lug and main breaker panelboardsare available through 600 amperes. NEHBmain breaker panelboards include a verticallymounted 100,225 or 400 ampere main breaker.High interrupting capacity main breakers areavailable. When EH or EHB breakers areapplied with 100 ampere 1-LIMITER M currentlimiting main breakers, NEHB panelboards areUL listed for application on circuits with100,000 amperes available fault current at208Y/120 V. ac, 240 V. ac and 480Y/277V. ac.tricalPartMAll interiors have top or bottom feedcapacity. Simply inverting the interior is all thatis required to convert from standard bottomteed to a top feed configuration. Conversion ofthe bottom feed main breaker to a top feedconfiguration is accomplished by rotating thebreaker 180 .EH (plug-on)Circuit BreakersOur MONO-FLAT front features com- .pletely concealed hinges and trim clamps andflush lock. Removal of the front is preventedwhen the door is closed and locked.0NEHB panelboards may be applied on thevoltage systems indicated in the table below.EHB (bolt-on)Circuit BreakersVoltagewww.Elec208Y/120V. ac240/120V. ac240V. acSystem Diagram·wye304WDelta 303W':Delta 304W480Y/277V. ac :wyeEMONO-FLAT front features completely concealedhinges and trim clamps; has a flush-mount Jock. 1984 SquareD Company0
.comEH/EHB Circuit BreakersualsSingle pole circuit breakers employ an im proved switching mechanism which provides maxi mum contact opening and handle pre-travel toretard contact bounce on closing, thus permittingthe breakers to pass the UL switching duty test. All15 and 20 ampere single pole breakers bear theSWD marking, verifying UL listing as switching dutybreakers when applied on 277V. ac and 120 V. acfluorescent lighting circuits.EH (plug-on)Circuit Breakers.anAll EH and EHB circuit breakers have the ULlisted interrupting capacities shown in the tablebelow and comply with Federal SpecificationW-C-3758, Class 13a and 13b.calPartMUL Listed Interrupting RatingRMS Symmetrical AmperesAm ereBranchPoles RatmgBreakerEHB (bolt-on)Circuit BreakersEHorEHBw.ElectriEHBwwA/1 15 and 20 ampere single polebreakers bear the SWD marking.VIS/- TRIP indicator ensures easy visualidentification of tripped 0014,00065,00014,00014,00065,000This revolutionary circuit breaker design, an in tegral part of our NEHB panelboard, is the key tolighting system flexibility. Both EH (plug-on) andEHB (bolt-on) circuit breakers have thermal mag netic tripping mechanisms which are factory cali brated for 40 C ambient temperature. Each breakeremploys an over-center, trip-free toggle type oper ating mechanism, with quick-make, quick-break ac tion. Easy visual identification of a tripped breakeris assured by the VIS I- TRIP indicator. When thecircuit breaker is tripped, the VISI-TRIP indicatorsprings into view.
.comAdditional FeaturesMONO-FLAT fronts feature a completely flushlock with stainless steel escutcheon. All hingesand trim clamps are completely concealed.MONO-FLAT fronts are virtually tamperproof,since the front cannot be removed with the doorclosed and locked.ualsFactory assembled lighting contactor and splitbus NEHB panelboards are ideal for frequentswitching or special distribution applications. Con tactor NEHB panelboards are available with eitherelectrically or mechanically held contactors (20through 225 ampere}. Split bus NEHB panelboardswith a wide range of splits and split length arrange ments are available (through 225 ampere}.anSub-feed lugs, both mechanical and compres sion type, may be factory assembled. In addition, afield installable 125 ampere bolt-on sub-feed lugkit may be bolted directly in the branch breakersection of NEHB panelboards.Single row construction interiors mounted incalPartM8%" wide boxes are available for column widthapplications. Main lug and main breaker devicesthrough 225 amperes are available. All columnwidth devices accept a maximum 60 amperebranch breaker.ElectriFactory assembled lighting contactorNEHB pane/board.wwwSingle row construction interiorsmounted in 8%" wide boxes areavailable for column widthapplications.125 and 225 ampere sub-feed lugs bolt directlyto the mains end of NEHB pane/boards.
.comInteriorsAll interiors accept both EH (plug-on) and EHB(bolt-on) breakers. Bus bars are fully insulated andsupported by high strength molded insulators whichprovide greater mechanical and dielectric strength.Use of these premium materials permits a rugged,compact design.cualsThe solid neutral assembly, located adjacent tothe mains compartment, permits easy access tobranch terminals from both sides. The fully insu lated solid neutral may be bonded to the enclosurefor service entrance applications. Standard mainlugs are mechanical AI/Cu type; UL Listed SquareDtype V CEL compression lugs are also available.anAll NEHB main lug interiors may be easily con verted to main breaker interiors by utilizing field in stalled main breaker kits. The kits attach directlyto the interior mounting rails. Preformed phase con nectors are included.tricalPartMPanelboards utilizing special main breakerswith accessories are also available. Main breakeraccessories include shunt trip, undervoltage trip,alarm switches and auxiliary contacts.www.ElecInstallationNEHB boxes are 20" wide by 5%" deep andare constructed of code gauge galvanized steel. Allboxes are supplied with knockouts. Wiring guttersmeet or exceed the latest UL or NEG requirements.NEMA 3R (rainproof) and NEMA 12 (dust tight)boxes are also available.Panelboard interiors mount flat against theback of the box. Leveling hardware or mountingbrackets are not required. Necessary interior/wallflush adjustments (corrects up to 3/4" of misalign ment) are made when the trim clamps on theMONO-FLAT front are tightened. This causesthe front to pull in flat against the wall.
.comualsancalPartMtrilec.EwwwContinuing engineering research and development may change specifications and data without notice.
tegral part of our NEHB panelboard, is the key to lighting system flexibility. Both EH (plug-on) and EHB (bolt-on) circuit breakers have thermal mag netic tripping mechanisms which are factory cali brated for 40 C ambient temperature. Each br
