NEMA Division 1 Explosion Proof Motors

Among our catalog of electric motors, we are proud to offer a wide range of Class I, Division 1 motors. For years, we have provided our customers with various hazardous location motors. Our selection of standard motors and custom electric motors are rated to operate in a wide range of hazardous environments classified.

The quality and performance of all standard and custom electric motors we sell meets or exceeds U.S. and international standards, including Underwriters’ Laboratories Inc. (UL), the Canadian Standards Association (CSA), the National Electrical Manufacturers’ Association (NEMA), and more.

What Exactly Is A Class 1, Division 1 Motor?

Hazardous location motors are meant to operate in areas where the environment contains gases, vapors, or dust that is combustible or ignitable. For motors to work safely in these environments, ignitions, and explosions must be contained within the equipment’s housing without igniting the surrounding air to avoid catastrophic external explosions.

This type of accident can be avoided by selecting the appropriate motor for the operating environment. To do this, one needs to know the class, division, and group classification of the environment. These hazardous classifications are defined by the NFPA 70® – National Electrical Code® (NEC) and the Canadian Electrical Code (CEC).

Class describes the type of material present in the surrounding environment. Class I locations contain combustible atmospheric gases or vapors in sufficient quantities to pose a risk of explosion or ignition.

Division defines the frequency of combustible materials in the atmosphere. In Division 1 locations, the explosive or ignitable materials are commonly present under normal working conditions.

Group further classifies hazardous materials based on their behavior after they have been ignited. Class I environments are subdivided into four groups, A through D. Groups are arranged in descending order of severity and risk. For example, Group A, which includes acetylene and hydrogen, creates an explosion that is more intense than a Group D material, such as ammonia or propane.

Based on these classifications, Class I, Division 1 motors are built to operate in environments routinely exposed to significant quantities of potentially explosive atmospheric gases or vapors. They must be built and labeled as explosion-proof.

Class I, Division 1 motors must possess specific characteristics to be classified as explosion-proof. First, the motor must be designed to contain any internal explosions without rupturing completely. Note that these motors do not prevent explosions, rather, explosions are confined within the motor’s housing without risk of igniting the surrounding environment. This is achieved by cooling gases heated by the internal pressure build-up during ignition. Gases pass through long, narrow passageways known as flame paths, quenching flames and cooling the gases below the minimum ignition temperature of the surrounding area.

Second, the construction of Class I, Division 1 motors must be robust enough to contain the resulting explosion and possess longer flame paths with tighter tolerances. Therefore, Group A materials result in the most intense explosions, and Class I, Division 1, Group A motors require the highest enclosure strength and longest/narrowest flame paths.

Furthermore, the external surfaces of Class I, Division 1 motors must stay cool, lest they ignite the hazardous gases present in the atmosphere. Motors are given an identification number that indicates the maximum temperature of the enclosure surface. This identification number is called a temperature code (T-code).

Class I, Division I motors are most commonly required in fume-heavy areas such as petroleum refining plants, utility gas plants, gas stations, spray painting areas, and aircraft hangars.

Available Brands and Services

At Dietz, we specialize in the supply and servicing of a wide selection of Class I, Division 1 motors (Groups C and D) from a variety of leading manufacturers. All of these motors have been tested and designed to meet or exceed NEMA and NEC specifications. They are also CSA- and UL-approved for use in explosive and hazardous locations.

Some of the explosion-proof motors that we currently supply include:

  • Siemens XP100
  • Brook Crompton NEMA Explosion-Proof Motors
  • Hyundai Explosion Proof Motors
  • Worldwide Electric Corp. Explosion-Proof Motors.
  • TECO EXP NEMA Premium Efficiency Explosion-Proof Motors
  • Tatung Explosion-Proof NEMA Premium Efficiency Series
  • Baldor Explosion-Proof Motors
  • Leeson Rigid Base Explosion-Proof Motors

Additionally, we can provide a specialized selection of custom electric motors suitable for operation in Division 1, Class A or B hydrogen-rich or equivalent hazardous environments. These custom electric motors are available in all NEMA frame sizes, from ¼-to-100 horsepower, and in foot and flange mountings. Single-phase custom electric motors are also available.

We also offer a comprehensive range of repair and maintenance services for explosion-proof and custom electric motors. Dietz Electric Co., is certified by Underwriters’ Laboratories Inc. (UL) to perform repairs on explosion-proof Class I, Division 1, Class C and D motors, and Division 1, Class 2, E, F, and G motors.

Our qualified technical staff also possesses the electrical and mechanical expertise to repair any motors we supply. All repairs meet and/or exceed NEMA, Electrical Apparatus Service Association (EASA), and/or Institute of Electrical and Electronic Engineers (IEEE) Standard 112A requirements.

At Dietz, we understand that there are times when a standard off-the-shelf motor may not always be the best solution. For specialized applications, our engineering department can either modify existing motors from our catalog or create unique NEMA- and IEC-compliant custom electric motors. We work with you to configure the best solution for your application.

See the list of all available modification options here.

The Best in Hazardous Area Motors

When selecting a motor to be used in a hazardous environment, careful attention must be paid to the classification of the operating environment and whether the selected motor is suitable to be used in that environment.

Understanding Class, Division, and Group classifications and the impact they have on design requirements can help you to adequately communicate specifications to us and minimize the risk of potentially catastrophic explosions. If you’re unsure, our team of experts can help you determine which off-the-shelf or custom electric motor will provide the safest possible operation at your worksite.

To learn more about our line of hazardous location standard motors or custom electric motors, contact us today or request a quote to discover options and pricing suitable to your unique needs.

Available Motors

XP100 - Class I, Group C & D, Class II, Groups F & G, Division 1 High Efficiency

  • 1 to 300 HP
  • Service factor, 40oC ambient
  • T3C temperature code
  • 900, 1200, 1800, or 3600 RPM
  • 3 phase, 60 Hz; 230/460 volt operation under 25 HP, 460 volt 25HP and above; 200 & 575 volt available
  • Class F insulation, Class B temperature rise
  • NEMA design B, Continuous Duty
  • 143T through 449T Frame
  • Inverter Duty 4:1 CT, 20:1VT
  • Two Normally Closed Class B Thermostats
  • Regreasable Bearings
  • C & D flanges Available
  • 3 Year Warranty
  • Also Class 1 Group D, Division 1, 1.15SF Drill Rig Duty XP100 1D1 (No Thermostats)

UL/CSA Approved Class I Group C & D Class II Groups E,F & G T3B 140 - 250T frame UL/CSA Approved Class I Group D Class II Groups E,F & G T3B 280T and above

  • NEMA MG1 Part 31 Inverter Duty
  • UL certified 5:1 constant torque
  • CSA certified 10:1 constant torque
  • S.F. 1.15 sine Wave. 1.0 S.F. S.F. VFD
  • IP55 degree of protection
  • NEMA Design B performance
  • Class F insulation
  • Dual rated 60 / 50 Hz
  • Thermostats fitted as standard
  • Sealed Ball Bearings 140 – 280T
  • Regreasable Bearings 320T and above
  • C & D Flanges are available
  • Stainless Steel Nameplate
  • F1 to F2 convertible
  • 575V, 60HZ also in stock
  • Warranty: 3 years

Hyundai Explosion Proof Motors - Rigid Base

  • 1-250 HP
  • 3600, 1800 and 1200 RPM
  • 208-230/460 volt (1-125 HP)
  • 460 volt (150-250 HP)
  • TEFC enclosure
  • 1.15 service factor
  • Class F insulation
  • Class B temperature rise
  • Rigid base, C-Flanged Available
  • Premium efficiency, meets or exceeds EISA 2007 requirements defined in NEMA MG-1 table 12-12
  • 5 year warranty
  • NEMA Design B
  • Cast iron frame and conduit box
  • Suitable for part winding start on low voltage (1-125 HP)
  • Suitable for wye-delta start (15-250 HP)
  • Unique multiple rating system for 40° and 55°C ambient
    • 143T-215T: T2C at 40°C, T2B at 55°C, T4 when thermostat is connected
    • 254T-286T: T2D at 40°C, T2C at 55°C, T4 when thermostat is connected
    • 324T-444T: T3 at 40°C, T2D at 55°C, T4 when thermostat is connected
    • 445T-449T: T3 at 40°C, T2D at 55°C, T4 when thermostat connected and 1.0 SF
  • Class I, Division 1, Groups C & D, UL Certification
  • CC # 038A, CSA Energy Certified

Worldwide Explosion Proof Motors, Premium Efficient Class I, Division 1, Groups C & D, T3C Temp Code Class II, Division 1, Groups E, F & G (254T-449T only)

  • 1-300 HP
  • 3600, 1800 and 1200 RPM
  • 208-230/460 volt (1-100 HP)
  • 460 volt (125-300 HP)
  • TEXP enclosure
  • 1.15 service factor
  • Class F insulation
  • Rigid base, C-Flanged Available
  • Premium efficiency (1-200 HP)
  • High efficiency (250-300 HP)
  • Three PTC thermistors provided (one per phase)
  • Regreasable Bearings 250 Frame and above
  • UL Listed
  • CSA Certified for use in Class I, Division 2 Hazardous Locations)

EXP NEMA Premium Efficiency Explosion Proof Totally Enclosed Fan Cooled 1 HP through 150 HP Speed 3600, 1800, 1200 RPM Voltage 230/460V (usable on 208V), 575V Frequency 60 Hz

  • Inverter Duty Magnet Wire
  • Rugged Cast-Iron Construction
  • Non-Sparking External Fan
  • Non-Sparking Brass Flingers on Both Ends
  • Oversized Cast-Iron Conduit Box
  • Non-hygroscopic Insulation System
  • Zn-Cd Plated Hardware
  • Stainless Steel Breather/Drains with Bronze Filter
  • Low Temperature Rise Operation
  • Stainless Steel Rating Nameplate and CSA Label
  • Bi-Directional Rotation
  • C-Flanged, and Round Body available
  • KLIXON®1 Temperature Limiting Device
  • Performance Data per ANSI/ IEEE Standard 112 Method B
  • UL Dual Labeled for Class I, Group D and Class II, Groups E, F and G
  • Complies with operating temperature code T2D for Group D and T3B for Group E, F and G
  • Inverter Duty per NEMA MG1-31 – speed ranges 10:1 variable torque, 2:1 constant torque

Explosion Proof NEMA Premium Efficiency Series

  • Output : 1HP ~ 200HP
  • Poles : 2, 4 & 6P
  • Frame size : 140T ~ 447T
  • Frequency : 60 Hz
  • Efficiency : NEMA Premium Efficiency
  • Output : 1HP ~ 200HP
  • Speeds: 3600,1800,1200 RPM
  • Frame size : 140T ~ 447T
  • Power : 3-Phase
  • Frequency : 60 Hz
  • Standard Voltage : 230/460V (Usable on 200V), 575V
  • Service Factor : 1.15
  • Nema Design : B
  • Insulation Class : F with B Rise @ 1.0 S.F.
  • Frame Material : Cast Iron
  • Regreasable 250 Frame and up
  • Klixon Thermal Protection
  • Hazardous locations :Division 1 Class I, Group D, Class II Group E,F&G, T3C Temp Code

Baldor Explosion Proof motors. Baldor has the widest offering in terms of types and options of Division 1 hazardous location electric motors

  • 0.25HP – 250HP
  • 1200, 1800, & 3600RPM
  • 48 – 447T Frames
  • 1 Phase up to 5HP
  • 115/230V, 230/460V, 575V
  • U.L. and CSA Certified
  • Class 1, Group D, Class 2 Groups F&G, Division 1
  • Class 1, Group C&D, Class 2 Groups F&G, Division 1
  • Class 1, Group D, Class 2 Groups E,F,G, Division 1
  • 1.15 Service Factor Drill Rig Duty
  • Auto Overload on fractional ratings
  • Normally Closed Thermostats on NEMA frame sizes
  • T3C & T4 temperature Codes
  • C-Flanged, and C-Flange footless available
  • Close-Coupled Pump, Jet Pump
  • Inverter Duty
  • Brakemotors 0.5 – 5HP

Leeson - Need Title

  • 0.33HP – 350HP
  • 1200, 1800, & 3600RPM
  • 56 –449T Frames
  • 1 Phase up to 5 HP
  • 115/230V, 230/460V
  • Nema Premium Efficient
  • U.L. and CSA Certified
  • Class 1, Group C&D, Class 2 Groups F&G, Division 1
  • Auto Overload on fractional ratings
  • Normally Closed Thermostats on NEMA frame sizes
  • T3B Temperature Codes
  • C-Flanged, and C-Flange footless available
  • Jet Pump
  • Inverter Duty
  • DC 90 & 180V 0.33,0.50,0.75HP, 1750RPM, 56C Frame


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