NEMA Explosion Proof Motor

$ 968.00$ 1,575.00


The NEMA 4 Premium Efficiency Explosion Proof Motor is designed for hazardous environments where safety is paramount.  Here are the key features:

Explosion-Proof Design:

    • The motor is built to withstand explosive conditions, making it suitable for Class 1, and Division 1 locations.  These are areas where flammable gases, vapors, or liquids may be present.
    • The enclosure type is TEFC (Totally Enclosed Fan-cooled), ensuring that no external elements can enter the motor housing.

Premium Efficiency:

      • The motor operates at high efficiency, minimizing energy consumption and reducing operating costs.
      • It adheres to NEMA Premium Efficiency standards, which means it meets or exceeds the minimum efficiency requirements set by the National Electrical Manufacturers Association (NEMA).

Voltage and RPM Options:

    • The motor is available in various voltages, including 208-230/460V and 575V.
    • It comes in different RPM (rotations per minute) configurations, such as 36001800, and 1200 RPM.

Temperature Rating:

    • The motor is suitable for hazardous environments with a temperature classification of T2D/T3B.
    • It can handle elevated temperatures without compromising safety.

Frame Size:

    • The motor is typically available in frame sizes such as 256T (for smaller motors) and other larger frames.

Service Factor:

    • The motor has a service factor of 1.15 for continuous duty at 60 Hz and 1.0 for continuous duty at 50 Hz.
    • This factor accounts for overload conditions and ensures reliable performance.

Insulation Class:

    • The motor uses Class F insulation, which provides good thermal protection and durability.

In summary, the NEMA 4 Premium Efficiency Explosion Proof Motor combines safety, efficiency, and versatility, making it an excellent choice for hazardous environments.  If you need further details or have any specific questions, feel free to ask!

Additional information


1, 1-1/2, 2, 3, 5, 7-1/2, 10, 15, 25, 30, 50, 75, 100


T = Rigid, TC = C-Face

Poles / RPM

2 = 3600RPM, 4 = 1800RPM, 6 = 1200RPM

Frame Size

143T, 145T, 182T, 184T, 213T, 215T, 215TC, 254T, 256T, 284T, 284TS, 286T, 286TS, 324T, 324TS, 326T, 326TSC, 364T, 365TS, 365T, 365TS, 404T, 405T, 405TS, 444T


208-230VAC, 460VAC


50HZ, 60HZ



Casting Material

CI = Cast Iron


NEMA Premium

• 50°C Ambient Temperature Rated
• Certified for Hazardous Locations
• IP 55 Ingress Protection
• Inverter Rated- 4:1 Constant Torque (MG1 Part 31)
• 1.15 Service Factor
• Dual Oversized Bearings with Labyrinth Seal
• Full Cast Iron Construction
• Vacuum Impregnated Stator
• Color Coded Lead wires
• Regreaseble Bearings 254T and larger
• Hazard Location Cert. Condensate Drains
• Conduit Box is 90° Rotatable
• IEEE 45 Above/Below Deck and Boiler Room Cert.
• Zerk Regreasable Bearings
• Temp Code T4 ≤ 326T Frame/ Temp Code T3C ≥ 364T
• Class 1, Division 1 Groups C, D
• Class 2, Division 1 Groups F, G
• Class 1-Zone 1/20/21-Group IIA/IIB Compliant
• 575 Volt Available
• C-Flanges Available ( “TC” in Part # )
• 36 Month Warranty


Below are the installation procedures for the NEMA 4 Premium Efficiency Explosion Proof Motor. Remember to consult the motor’s manufacturer documentation for specific details related to your model.

Safety Precautions:

  • Before installation, ensure that the power supply is disconnected.
  • Follow all safety guidelines for working in hazardous environments.
  • Use appropriate personal protective equipment (PPE).

Motor Mounting:

  • Choose a suitable location for the motor, considering accessibility for maintenance.
  • Mount the motor securely on a stable surface using appropriate brackets or mounts.
  • Ensure proper alignment with driven equipment (e.g., pumps, fans).

Electrical Connections:

  • Connect the motor leads to the corresponding power supply terminals.
  • Verify that the voltage matches the motor’s rating (e.g., 208-230/460V or 575V).
  • Tighten terminal connections to the specified torque.


  • Ground the motor according to local electrical codes.
  • Use grounding conductors and ensure a low-resistance path to the ground.

Conduit and Wiring:

  • Install suitable conduit (explosion-proof conduit) to protect the wiring.
  • Route wiring from the motor to the control panel.
  • Seal conduit entries to prevent dust or gas ingress.

Motor Cooling:

  • Ensure proper ventilation around the motor.
  • Clean any dust or debris from the motor’s cooling fins.
  • Verify that the fan (if present) is functioning correctly.

Motor Rotation:

  • Confirm the desired motor rotation direction (clockwise or counterclockwise).
  • Adjust wiring connections if needed to achieve the correct rotation.

Motor Protection:

  • Install overload protection (thermal overload relays or electronic protection devices).
  • Set overload settings based on the motor’s full-load current.

Testing and Commissioning:

  • Reconnect power and verify that the motor starts without abnormal noise.
  • Monitor motor temperature during operation.
  • Check rotation direction using a strobe light or visual inspection.

Labeling and Documentation:

  • Label the motor with relevant information (voltage, current, RPM, etc.).
  • Document installation details, including date, installer, and any deviations from standard procedures.

Remember to consult our motor’s specific datasheet or user manual for any additional instructions or unique requirements. Always prioritize safety and compliance with local regulations!


Proper maintenance ensures the longevity and reliable performance of the NEMA 4 Premium Efficiency Explosion Proof Motor.  Here are the maintenance requirements and procedures:

Regular Inspections:

  • Conduct visual inspections periodically.
  • Check for signs of wear, damage, or corrosion.
  • Inspect cable connections, conduit seals, and gaskets.


  • Keep the motor clean and free from dust, dirt, and debris.
  • Use compressed air or a soft brush to clean cooling fins and vents.
  • Avoid using water or harsh chemicals.


  • Follow the manufacturer’s recommendations for lubrication intervals.
  • Lubricate bearings and other moving parts as needed.
  • Use the correct type of lubricant (grease or oil).

Bearing Maintenance:

  • Monitor bearing temperature during operation.
  • Inspect bearings for noise, vibration, or excessive play.
  • Replace worn or damaged bearings promptly.

Seals and Gaskets:

  • Inspect and replace seals and gaskets as necessary.
  • Ensure proper sealing to prevent gas or liquid ingress.

Motor Alignment:

  • Check motor alignment with driven equipment (e.g., pumps, fans).
  • Misalignment can cause premature wear and reduced efficiency.

Temperature Monitoring:

  • Use temperature sensors to monitor motor temperature.
  • Address any overheating issues promptly.

Vibration Analysis:

  • Regularly analyze motor vibration using specialized tools.
  • Detect early signs of imbalance or misalignment.

Electrical Connections:

  • Inspect wiring and terminals for tightness and signs of damage.
  • Tighten loose connections.
  • Verify proper grounding.

Motor Testing:

  • Perform load tests periodically.
  • Measure current, voltage, and power factor.
  • Compare results to the motor’s specifications.


  • Maintain a log of maintenance activities.
  • Record inspection dates, findings, and corrective actions.

Remember that maintenance schedules may vary based on operating conditions, environment, and motor usage.  Always consult the motor’s documentation and follow safety guidelines.


Q&A related to NEMA 4 Explosion Proof Motors:

What is a NEMA 4 Explosion Proof Motor?

  • A NEMA 4 Explosion Proof Motor is specifically designed for hazardous environments where flammable gases, vapors, or liquids may be present. It adheres to safety standards and provides reliable performance even in explosive atmospheres.

What are the key features of NEMA 4 Explosion Proof Motors?

  • Explosion-proof enclosure (TEFC) to prevent external elements from entering.
  • Premium efficiency, minimizing energy consumption.
  • Available in various voltages (e.g., 208-230/460V, 575V) and RPM options (e.g., 3600, 1800, 1200 RPM).
  • Suitable for Class 1, and Division 1 locations.

Where are NEMA 4 Explosion Proof Motors commonly used?

  • Oil and gas industry (drilling rigs, refineries).
  • Chemical processing plants.
  • Mining and quarrying.
  • Pharmaceutical and biotech facilities.
  • Food and beverage industry.
  • Water and wastewater treatment.
  • Manufacturing and production.
  • Marine and offshore platforms.
  • Agriculture and irrigation.
  • Utilities and power generation.

What are the installation procedures for NEMA 4 Explosion Proof Motors?

  • Safety precautions: Disconnect power, and use PPE.
  • Motor mounting: Securely mount on a stable surface.
  • Electrical connections: Properly connect leads, and verify voltage.
  • Grounding: Ensure proper grounding.
  • Motor cooling: Clean cooling fins, and verify fan operation.
  • Motor rotation: Confirm the desired direction.
  • Motor protection: Install overload protection.
  • Testing and commissioning: Verify motor operation.

How should NEMA 4 Explosion Proof Motors be maintained?

  • Regular inspections for wear and damage.
  • Cleaning (avoid water or harsh chemicals).
  • Lubrication of bearings and moving parts.
  • Bearing maintenance and temperature monitoring.
  • Vibration analysis for imbalance or misalignment.
  • Proper electrical connections and testing.
  • Document maintenance activities.

Remember to consult the manufacturer’s documentation for specific details related to your motor model.

Advantages and Disadvantages


Safety in Hazardous Environments:

  • NEMA 4 Explosion Proof Motors are specifically designed for use in hazardous locations where flammable gases, vapors, or liquids are present.
  • Their robust construction prevents the ignition of explosive atmospheres, ensuring safety for personnel and equipment.

Compliance with Standards:

  • These motors adhere to strict safety standards, such as NEMA (National Electrical Manufacturers Association) and NEC (National Electrical Code) requirements.
  • Compliance ensures that the motor can operate safely in classified areas.

Durability and Corrosion Resistance:

  • NEMA 4 motors feature rugged enclosures (often cast iron or aluminum) that withstand harsh conditions.
  • They resist corrosion, moisture, and dust ingress, prolonging their lifespan.

Premium Efficiency:

  • NEMA 4 motors are designed for energy efficiency, reducing operating costs.
  • Their high efficiency minimizes wasted energy and heat generation.


  • Available in various voltages (e.g., 208-230/460V, 575V) and RPM options (e.g., 3600, 1800, 1200 RPM).
  • Suitable for diverse applications across industries (oil and gas, chemical, mining, etc.).


Higher Initial Cost:

  • NEMA 4 Explosion Proof Motors are more expensive upfront due to their specialized design and safety features.
  • The investment may be justified by the need for safety and compliance.

Maintenance Complexity:

  • Regular inspections and maintenance are crucial to ensure continued safety.
  • Seals, gaskets, and explosion-proof conduit require attention.

Weight and Size:

  • The robust construction adds weight and bulk to the motor.
  • Installation and handling may be more challenging.

Limited Availability:

  • Not all motor manufacturers offer NEMA 4 models.
  • Availability may vary based on region and specific requirements.

Specific Application Focus:

  • NEMA 4 motors are primarily designed for hazardous environments.
  • Using them in non-hazardous areas may be unnecessary and costly.

Remember that the choice of motor depends on the application, safety requirements, and budget considerations. Always consult experts and consider the specific needs of your project!


The NEMA 4 Premium Efficiency Explosion Proof Motor finds applications in various industries and scenarios where safety, reliability, and efficiency are critical. Here are some common applications:

Oil and Gas Industry:

  • Used in drilling rigs, refineries, and petrochemical plants.
  • Handles hazardous gases, vapors, and liquids.
  • Provides reliable power for pumps, compressors, and fans.

Chemical Processing Plants:

  • Suitable for mixing, agitating, and pumping corrosive chemicals.
  • Ensures safe operation in volatile environments.

Mining and Quarrying:

  • Powers conveyor belts, crushers, and pumps in mines.
  • Resists dust, moisture, and explosive gases.

Pharmaceutical and Biotech:

  • Used in cleanrooms and laboratories.
  • Ensures compliance with safety standards.

Food and Beverage Industry:

  • Drives mixers, conveyors, and packaging machinery.
  • Resistant to washdowns and harsh cleaning agents.

Water and Wastewater Treatment:

  • Operates pumps, blowers, and aerators.
  • Handles wet and corrosive environments.

Manufacturing and Production:

  • Powers conveyor systems, agitators, and extruders.
  • Suitable for chemical, textile, and automotive factories.

Marine and Offshore Platforms:

  • Used in ship propulsion, winches, and cranes.
  • Withstands saltwater exposure and explosive atmospheres.

Agriculture and Irrigation:

  • Drives water pumps for irrigation and crop spraying.
  • Resists dust, dirt, and extreme temperatures.

Utilities and Power Generation:

  • Operates fans, blowers, and generators.
  • Ensures reliable performance in power plants.

Remember, safety certifications and proper installation are crucial for these applications.  Always consult with experts to select the right motor for your specific needs!




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