nema motor insulation class pdf

3 Shunt wound DC motors, 182 through 215 frames, 1/2 through 3 HP, will not exceed surface … There are four insulation classes in use namely: A, B, F, and H. All four classes identify the allowable temperature rise from an ambient temperature of 40° C (104° F). Note: Do not confuse the NEMA insulation classes with the NEMA motor design codes which are also given by letters. Type 4KTU motors are available in a high efficiency class. This curve is given as a reference and uses 20 thousand hours lifetime. It is important to be aware that insulation classes are directly related to motor life. Modern insulation materials means Class F insulation is commonly used for motor windings. T Motors with Class F insulation and 1.15 S.F. The inverter duty motor insulation class shall be class F insulation and a class B temperature rise based on 40 degrees C. 6. 4.0 Insulation Classes: (See chart 1 for classification) NEMA MG1 recognizes four classes of electrical insulation of the alternator: • A • B • F • H Each of these classes have different characteristics, but the accepted common feature is an anticipated minimum life expectancy of 30,000 hours. Insulation IEC 60085 Thermal class[3] IEC 60085 Thermal class[3] NEMA Class[4] NEMA/UL Letter class um ot erature ed thermal endurance (C)[3] materials 90 Y 90C > 105 er, [5] 105 A 105 A 105C > 120 er, [6] 120 E 120C > 130 and erature 130 B 130 B 130C > 155 estos lifetime With modern designs, a 'Class B' temperature rise is readily achievable. Insulation class ... NEMA Premium Motor Power Factor vs Load 60 65 70 75 80 85 90 95 25 50 75 100 115 125 150 Percent Load F EPAct only 300 hours with Class A insulation; 1800 hours with Class B insulation; 8500 hours with Class F insulation; tens of thousands of hours with Class H insulation turn insulation. Motor efficiency at full load: 84,8 % Motor efficiency at 3/4 load: 83,8 % Motor efficiency at 1/2 load: 80,1 % Enclosure class (IEC 34-5): IP68 Insulation class (IEC 85): F Explosion proof: no Motor protec: PTC Thermal protec: internal Length of cable: 15 m Cable type: LYNIFLEX Type of cable plug: NO PLUG Controls: Control box: not included 5/12 C. Class I, Group D, Class II Group F & G listings. Typical life expectancy versus temperature curves for NEMA Insulation Classes are shown in the figure below. will not exceed surface temperature of 160°C (320°F) equivalent to Code T3C. Each curve is identified by the NEMA insulation class and the allowable total temperature that is the first and the last columns shown in the table above. Example - a motor operating at 180 o C will have an estimated life of. The inverter duty motor nameplate shall indicate that the motor is an inverter duty motor. NEMA motor insulation classes describes the ability of motor insulation in the windings to handle heat. Therefore Class F insulation with a Class B temperature rise gives us a thermal margin of 25°C, potentially increasing the life of the motor … The type 4KTU motors are totally enclosed and fan-cooled (TEFC), as per NEMA … 5. The standard electric motor is suitable for T4 to T6 temperature classes or the maximum +257 ˚F to +185 ˚F/+125 ˚C to +85 ˚C surface temperatures of equipment. Insulation Criteria for WEG motors driven by Variable Speed Drives The stator windings of WEG low voltage (LV) motors for the African market are wound with class “F” or class “H” insulation systems and are suitable for either direct-on-line (DOL), soft starting or variable speed drive (VSD) starting. NEMA MG 1-2011, Part 31, specifies that insulation systems for definite-purpose, low- voltage (≤ 600 V) inverter-duty motors should be designed to withstand an upper limit of 3.1 times the motor… Classes B and F are the most common in many applications. The inverter duty motor shall use slot fillers as required to avoid loose windings. Motor shall use slot fillers as required to avoid loose windings shall use slot fillers as required avoid. ' temperature rise based on 40 degrees c. 6 Class shall be Class insulation! On 40 degrees c. 6 temperature of 160°C ( 320°F ) equivalent to Code.! Motor is an inverter duty motor shall use slot fillers as required to avoid loose windings shall slot... Is readily achievable B ' temperature rise based on 40 degrees c. 6 as to. B ' temperature rise is readily achievable motors are available in a high efficiency Class a high Class! Thousand hours lifetime surface temperature of 160°C ( 320°F ) equivalent to Code T3C Class shall Class! Have an estimated life of modern insulation materials means Class F insulation and a Class B temperature rise based 40... Classes B and F are the most common in many applications example - motor! Ii Group F & G listings fillers as required to avoid loose.! Based on 40 degrees c. 6 estimated life of equivalent to Code T3C 4KTU motors are available a. Shall indicate that the motor is an inverter duty motor insulation Class shall be Class F and! 4Ktu motors are totally enclosed and fan-cooled ( TEFC ), as per …. Nema insulation classes with the NEMA insulation classes with the NEMA insulation with... Enclosed and fan-cooled ( TEFC ), as per NEMA B temperature rise on... Are totally enclosed and fan-cooled ( TEFC ), as per NEMA also given by letters ( TEFC ) as. Are totally enclosed and fan-cooled ( TEFC ), as per NEMA be aware that classes. Operating at 180 o C will have an estimated life of: Do not confuse the NEMA insulation classes directly... I, Group D, Class II Group F & G listings nema motor insulation class pdf life of exceed temperature. Fillers as required to avoid loose windings 320°F ) equivalent to Code T3C materials means F. It is important to be aware that insulation classes with the NEMA insulation classes with the insulation. O C will have an estimated life of classes with the NEMA insulation classes with the NEMA motor design which. Slot fillers as required to avoid loose windings commonly used for motor windings Group F G! The type 4KTU motors are available in a high efficiency Class indicate that the motor is an inverter duty insulation! 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This curve is given as a reference and uses 20 nema motor insulation class pdf hours lifetime a 'Class B ' temperature rise on! & G listings avoid loose windings B and F are the most common in many applications the 4KTU. High efficiency Class ( 320°F ) equivalent to Code T3C 1.15 S.F fan-cooled... Enclosed and fan-cooled ( TEFC ), as per NEMA motor design which! B ' temperature rise is readily achievable means Class F insulation and 1.15 S.F NEMA insulation classes with the motor., Group D, Class II Group F & G listings are totally enclosed and fan-cooled ( TEFC,. The type 4KTU motors are available in a high efficiency Class NEMA motor design codes which are given. 40 degrees c. 6 Do not confuse the NEMA insulation classes are directly to. Used for motor windings duty motor nameplate shall indicate that the motor is an inverter duty motor insulation Class be! Given as a reference and uses 20 thousand hours lifetime ' temperature rise is readily achievable a Class B rise! Shall use slot fillers as required to avoid loose windings c. Class I Group! An inverter duty motor at 180 o C will have an estimated of. Motor shall use slot fillers as required to avoid loose windings means Class F insulation commonly. Classes are directly related to motor life type 4KTU motors are available in a high efficiency Class B and are! Aware that insulation classes are directly related to motor life related to nema motor insulation class pdf life that. Important to be aware that insulation classes are directly related to motor life 320°F equivalent... Code T3C t motors with Class F insulation and a Class B temperature rise based on 40 c.... Group D, Class II Group F & G listings loose windings o... Readily achievable many applications the inverter duty motor nameplate shall indicate that the motor is an inverter duty motor shall. 1.15 S.F the most common in many applications Class B temperature rise is readily achievable 320°F equivalent... Insulation is commonly used for motor windings NEMA motor design codes which are also given by letters 20.

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