14/016 Technical Data NEMA / EEMAC Ratings

1 General InformationTechnical DataNEMA / EEMAC RatingsMoeller Electric CorporationVoltage ratingsNEMA and EEMAC Standards recognize that industrial control is normally applied to the point of power utilization and that this utilization voltage is somewhat lower than nominal system voltages. The NEMA Standard Industrial Control and Systems - 1993 includes the following:ICS Rated Operational Voltage (Ue)Low voltage Ratings for industrial control apparatus are based on utilization voltages and shall be as follows:a) Alternating current, 60 Hertz, multiphase - 115, 200, 230, 400, 460 and 575 voltsb)Alternating current, 60 Hertz, single phase - 115 and 230 voltsc)Direct current - 115 and 230 voltsIndividual manufacturers may choose to mark coils or control-circuit transformers at the utilization voltage (listed above) or the corresponding nominal system voltage (120, 208, 240, 416, 480 or 600 volts, 60 Hertz).

2 Coils marked with voltage Ratings in multiples of 115 volts are considered adequate for use on nominal system voltage Ratings in multiples of 120 line with the above, industrial control equipment in this catalog is listed at the utilization voltage. Circuit breakers are listed at their corresponding nominal system called voltsSystem voltageUtilization voltage110-115-120120115208208200220-230 -240240230440-460-480480460550-575-60060 0575 NEMA / EEMAC Sizes Motor starters are sometimes referred to by their NEMA/ EEMAC sizes. The NEMA Standard Industrial Controls and Systems -1993 (ICS ) lists the following horsepower Ratings for these sizes for non-plugging and non-jogging duty:Three Phase575 volts230 voltsSizeHPSizeHP002001 050311017 2252153503304100450520051006400620076007 30089008450916009800460 volts200 voltsSizeHPSizeHP002001 050311017 225210350325410044052005756400615076007- 89008-916009-Single Phase230 volts115 voltsSizeHPSizeHP001001/3020113121P51P32 7 23 NEMA/ EEMAC sizes are not shown in our catalog listings but are easily converted to HP and voltage by reference to the above tabulation.

3 It should be recognized that the NEMA/ EEMAC Standard on Motors and Generators (MG-1-1998) list more HP Ratings than that are shown above. For many of these in-between sizes , Moeller Electric offers contactors and starters, with performance guaranteed, sized for the motor HP, at more economical prices than the NEMA/ EEMAC sizes. NEC 2002 General, 430, 1 through IMotor Circuit Conductors, through IIMotor and Branch Circuit Overload Protection, through IIIM otor Branch Circuit Short-Circuit and Ground-Faul Protection, through IVMotor Feeder Short-Circuit and Ground-Fault Protection, through VMotor Control Circuits, through VIMotor Controllers, through VIIM otor Control Centers, through VIIID isconnecting Means, through IXOver 600 Volts, Nominal, through XProtection of Live Parts - All Voltages, through XIGrounding - All Voltages, through XIIT ables, Tables through 430151(B)

4 Part XIIIU seful Electrical FormulasTo findAC SystemDC System3 phase1 phaseHP output1 x E x x %Eff x cos 7461 x E x %Eff x cos 7461 x E x %Eff746 Amperes when HP is knownHP x 746E x x %Eff x cos HP x 746E x %Eff x cos HP x 746E x %EffkVAI x E x x E1000 Amperes when kVA is knownkVA x x EkVA x 1000 EkWI x E x cos 1000I x E cos 1000I x E1000 Amperes when kW is knownkW x x E x cos kW x 1000E x cos kW x 1000EI = AmperesE = VoltskVA = Kilo-volt-ampereskW = Kilowatts%Eff = per cent efficiencycos = power factor1-866-595-96161-630-595-9515Go to: General InformationTechnical DataRating Codes, Environmental Protection StandardsMoeller Electric CorporationRating Codes for AC Control Circuit: Contacts at 50 and 60 HzContact rating code designation 1)Thermal continuous test currentMaximum current, A 2)VAAMakeBreakMakeBreakMakeBreakMakeBrea kMakeBreakA 7200720A 7200720A 3600360B 3600360B 1800180C 1800180C 43272D 43272E 21636 Rating Codes for DC Control Circuit ContactsContact rating code designation 1)Thermal continuous test currentMax.

5 Make or Break Current, A 3)Max. Make and break VA st 300V or lessA125V250V301 to 600VN 275N 275N 138P 138P 69Q 69Q 28R 28 Notes:1) The numerical suffix designates the maximum voltage design values, which shall be 600V, 300V, and150V for suffixes 600, 300, and 150 )For maximum Ratings at voltages between the maximum design value and 120V, the maximum make-and-break Ratings shall be obtained by dividing the volt-ampere rating by the applicable voltage. For voltages below 120V, the maximum make current shall be the same as for 120V and the maximumbreak current shall be obtained by dividing the break volt-ampere by the application voltage, but shall not exceed the thermal continuous test )For maximum Ratings at 300V or less, the maximum make-and-break Ratings shall be obtained by dividing the volt-amperes rating by the application voltage, but shall not exceed the thermal continuous test : CSA standard No.

6 24-M 1995, UL 508 Tables and 1999 (17th edition)14/0171-866-595-96161-630-595-95 15Go to.