What Parameters to Know When Choosing Explosion-Proof Motors

Regarding explosion-proof motor models, classifications, grades, national standards, and installation methods, these should be the areas that many customers need to understand.No Chinese content provided, so no translation needed.At the most basic level, you can imagine that when we want to purchase a product, we would first need to understand all its parameters.Below, we delve into a detailed analysis and explanation of explosion-proof motor models, classifications, ratings, national standards, and installation methods.

One, Explosion-proof motor model - letter meanings

Currently, there's a vast array of explosion-proof motor models domestically, making it difficult for non-experts to identify them. What do all those letters and numbers signify? What do the large-printed parameters on the explosion-proof motor labels actually mean?

To assist you in resolving this issue, I have compiled and edited a wealth of information on explosion-proof motor models, classifications, protection ratings, national standards parameters, and installation methods for your reference and study.

Explosion-proof electric motor modelThe letters represent the following meanings.

Y represents "Asynchronous Motor."

B-Represents "Explosion Proof"

X-Represents "High Efficiency and Energy Saving"

2- Product Design Sequence No., indicating the 2nd design iteration.

3- Product Design Serial No., indicating the third design iteration.

YB - Represents "Explosion-proof asynchronous motor"

A- represents the "Enhanced Safety" model.

K-Product Feature Code, indicating mine-specific.

YA stands for explosion-proof asynchronous motor

The letter "F" stands for "Ventilation" and "Dust," for example, YBF represents an explosion-proof asynchronous motor for fans, while YFB stands for dust explosion-proof motor.

The "S" stands for "water" cooled and "transmission" motor, such as YBS represents the explosion-proof asynchronous motor for conveyors, and YBSS represents the water-cooled explosion-proof asynchronous motor for conveyors.

EExd-Explosion-proof motor.

EExe-Enhanced Safety Motors

Explosion-proof motors EExd and increased safety motors EExe areNo Chinese content provided.Two common types of explosion-proof motors, the EExd's application environment area is higher than that of EExe.

Motor base frame number examples:

YBX3-355M1-4w Explosion-Proof Electric Motor Model

Y - Asynchronous Motor; B - Explosion-proof; X - High Efficiency; 3 - Third Generation Explosion-proof Motor (Design Sequence Number); 355 - Center Height 355MM; M - Medium Foot; 1 - Caring Length 1; 4 - Number of Electrodes; W - Special Code (Outdoor Type)

IEC Explosion Proof Standard Format: Ex(ia)ⅡC T4

E: Recognized by the CENELEC mark; Ex: Explosion-proof general marking; IA: Explosion-proof type (intrinsically safe); II: Equipment group; C: Gas group

Section 2: Explosion-proof Electric Motor Standards - Production Standards (National Standard)

Explosion-proof motors generally require an explosion-proof certificate during purchase. They are mainly used in coal mines, oil and natural gas, petrochemical, and chemical industries.

The rated voltage, rated current, power, and speed of explosion-proof motors are the same as those of ordinary motors; the only difference is that explosion-proof motors have an additional explosion-proof symbol: Ex.

Intrinsically Safe Type + Equipment Category + (Gas Group) + Temperature Group Explosion-Proof.

Blast-proof certificates are typically issued by national departments and can be verified online for authenticity and validity. For the relevant factories, this certificate is necessary to ensure the safety and qualification of explosion-proof motors.

Our country's explosion-proof grade standard is "GB3836.1-2000 Electrical Equipment for Explosive Gas Atmospheres," which will be supplemented or amended by the following explosion-proof type-specific standards.

GB 3836.2 Electrical Equipment for Explosive Gas Atmospheres – Part 2: "d" Type Flameproof Equipment

GB 3836.3: Electrical Equipment for Explosive Gas Atmospheres, Part 3: Increased Safety "e"

GB 3836.4 Electrical equipment for explosive gas atmospheres — Part 4: Equipment for intrinsic safety "i"

GB 3836.5: Part 5 - Electrical Equipment for Explosive Gas Atmospheres: Positive Pressure Type "p"

GB 3836.6: Part 6 - Electrical Equipment for Explosive Gas Atmospheres: Oil-filled Type "O"

GB 3836.7: Part 7 of Electrical Equipment for Explosive Gas Atmospheres - Sand-filled Type "q"

GB 3836.9: Part 9 of Electrical Equipment for Explosive Gas Atmospheres: Encapsulation Type "m"

GB 7957 Mining Safety Helmet Lamp

The above and this standard do not apply to medical electrical equipment, detonators, detonator testers, and ignition circuit testers.

Common Symbol: "ExdⅠ/Ⅱ BT3"

"Ex" is a general symbol representing explosive.

"d" indicates the explosion-proof type is "diaphragm-type d."

"I" or "II" denote the classification of electrical equipment, with I representing electrical equipment for coal mines and II for equipment used in explosive gas environments other than coal mines. Among them, Class II explosion-proof "d" and intrinsic safety "i" electrical equipment are further divided into Class II A, II B, and II C. "T3" indicates the temperature group. For specific classifications and meanings, please refer to "GB3836.1-2000 Electrical Equipment for Explosive Gas Atmospheres."

The National Quality Supervision, Inspection, and Quarantine Bureau (NQSIQB) authorized national product quality supervision and inspection institution, and the National安全生产 Supervision and Management Bureau authorized national safety production A-grade inspection and testing institution, it is the only national explosion-proof electrical product quality supervision and inspection center recognized by the China National Accreditation Service for Conformity Assessment (CNAS) and authorized by the China Certification and Accreditation Administration (CNCA); it is also recognized by the National Import and Export Commodity Inspection Laboratory Accreditation Committee as an import and export explosion-proof electrical product verification testing institution.

1 JB/T 9593.1-2002 Technical Conditions for Explosion-Proof Three-Phase Asynchronous Motors for Coal Mines, Part 1: YBK2 Series Explosion-Proof Three-Phase Asynchronous Motors for Underground Coal Mines (Frame Sizes 100-315)

JB/T 10685-2006 YBD2 Series Explosion-Proof Variable-Pole and Multi-Speed Three-Phase Asynchronous Electric Motors Technical Specifications (Frame Size 80-280)

JB/T 6201-2006 YBDC2 Series Explosion-Proof Capacitor-Starting Single-Phase Induction Motors (Frame Sizes 71 to 132) Technical Specifications

YW Series Non-Spark Type Three-Phase Asynchronous Motor Technical Specifications (Frame Size 80-315)

5 MT 451-1995 General Technical Specification for the Safety Performance of Explosion-Proof Low-Voltage Three-Phase Asynchronous Motors for Coal Mines

6 JB/T 7565.2-2002: Technical Conditions for Explosion-proof Three-Phase Asynchronous Motors - Part 2: YB2-W, YB2-TH, YB2-THW, YB2-TA, YB2-TAW Series Explosion-proof Three-Phase Asynchronous Motors (Frame sizes 63-355)

JB/T 10352-2002 YFB Series Dust-Ex-proof Three-Phase Asynchronous Motors (Frame Sizes 63-355) Technical Specifications

8 JB/T 10353.1-2002 Technical Conditions for Explosion-Proof Electric Motors for Fuel Dispensers, Part 1: Explosion-proof three-phase asynchronous electric motors for YBJY series fuel dispensers (frame sizes 63-100)

9 JB/T 7565.4-2004 Technical Conditions for Explosion-Proof Three-Phase Asynchronous Motors, Part 4: YB2 Series Explosion-Proof (ExdⅡCT1～T4) Three-Phase Asynchronous Motors (Frame Sizes 63～355)

10 JB/T 7565.5-2004: Technical Conditions for Explosion-Proof Three-Phase Asynchronous Electric Motors - Part 5: Explosion-Proof Three-Phase Asynchronous Electric Motors for YBF2 Series Fans (Frame Sizes 63-355)

11 MT/T 249-1997 Mining-Used Explosion-Proof Double-Speed Three-Phase Induction Motors

12 MT/T 575-1996 Explosion-Proof Three-Phase Asynchronous Motors for Pumping Stations in the YBRB Series

13 JB/T 50136.1-1999: Evaluation Method for Reliability Indices of Explosion-Proof Three-Phase Asynchronous Motors (Laboratory Method) (For Internal Use)

14 JB/T 8731-1998 Temporary Provision for the Manufacturing and Inspection of Soft Connection Structure for Explosion-Proof Motor Terminal Boxes

15 JB/T 8674-2007 YB2 Series High-Voltage Explosion-Proof Three-Phase Induction Motors - Technical Specifications (Frame Sizes 355 to 560)

16 JB/T 7565.7-2006 Technical Conditions for Explosion-Proof Three-Phase Asynchronous Motors - Part 7: Explosion-proof three-phase asynchronous motors for YBGB2, YBGB2-W series pipeline pumps, and outdoor pipeline pumps (frame sizes 80-315)

17 JB/T 7565.6-2004 Technical Conditions for Explosion-Proof Three-Phase Asynchronous Motors, Part 6: YB2-H Series Marine Explosion-Proof Three-Phase Asynchronous Motors (Frame Sizes 63-355)

18 MT 902-2002 Coal Mine Electric Anchor Drill Motor

19 JB/T 7565.1-2004 Technical Conditions for Explosion-Proof Three-Phase Asynchronous Motors, Part 1: YB2 Series Explosion-Proof Three-Phase Asynchronous Motors (Frame Sizes 63-355)

20 JB/T 50136.2-1999防爆型Three-Phase Asynchronous Motor Explosion-Proof Component Reliability Evaluation Method (Laboratory Method) (For Internal Use)

21 JB/T 7565.3-2004 Technical Conditions for Explosion-Proof Three-Phase Asynchronous Electric Motors, Part 3: Explosion-proof, outdoor-resistant asynchronous electric motors of series YB2-F1, YB2-WF1, YB2-F2, YB2-WF2 (frame sizes 63-355)

Section 3: Explosion-Proof Motor Grades - Explosion-Proof Principle

1. The Concept of Explosion

In a very short span of time, a large amount of energy is released, generating high temperatures and expelling a substantial volume of gases, causing a chemical reaction or state change in the surrounding medium under high pressure. The rapid release of energy will subject surrounding objects to violent shocks and destruction.

Three Necessary Conditions for an Explosion: 1) Explosive Material: Substances that can react with oxygen (air), including gases, liquids, and solids. (Gases: Hydrogen, acetylene, methane, etc.; Liquids: Alcohol, gasoline; Solids: Dust, fibrous dust, etc.) 2) Oxygen: Air. 3) Ignition Source: Includes open flame, electrical sparks, mechanical sparks, static sparks, high temperatures, chemical reactions, and light energy.

2. Reasons for explosion prevention considerations

Explosive Materials: Many production sites generate certain flammable substances. Approximately two-thirds of underground coal mine facilities have explosive materials; in the chemical industry, over 80% of production areas contain explosive substances. Oxygen: Oxygen in the air is omnipresent. Ignition Sources: During the production process, the extensive use of electrical instruments, various friction sparks, mechanical wear sparks, static sparks, and high temperatures are unavoidable, especially when instruments or electrical systems malfunction. Objectively, many industrial sites meet the conditions for explosion. When the mixture of explosive materials and oxygen is within the explosive limit range and an ignition source is present, an explosion will occur. Therefore, implementing explosion-proof measures is of utmost necessity.

3. Explosion-proof Mark - Safety Factor

The explosive hazards in factories or mining areas are scientifically categorized and graded based on their ignition energy, minimum ignition temperature, and the duration of the presence of explosive gases in the field, to determine the explosion-proof marking and type of explosion-proof equipment on-site.

Explosion-proof marking format:

　　Ex (ia) ⅡC T4 

Explosion-proof Marking, Explosion-proof Class, Gas Group, Temperature Group

Explanation of Explosion-Proof Ratings:

ia Rating:

Electrical equipment that cannot ignite an explosive gas mixture under normal operation, a single fault, or two faults.

During normal operations, the safety factor is 2.0.

In the event of a failure, the safety factor is 1.5.

At two failures, the safety factor is 1.0.

Note: Spark-generating contact points must be fitted with explosion-proof enclosures, airtight enclosures, or enhanced safety factors.

IB Level:

Electrical equipment that cannot ignite explosive gas mixtures under normal operation or during a fault.

During normal operation, the safety factor is 2.0; during a single fault, the safety factor is 1.5.

During normal operation, sparking contacts must be protected with explosion-proof or airtight enclosures, and feature fault self-display measures. In the event of a fault, the safety factor is 1.0.

Electrical Explosion-proof Grade - Protection Grade (IP)

Explosion-proof motors can be divided into two categories:
Category I: Underground Coal Mine Electrical Equipment
Category II: Electrical equipment for all explosive gas environments except for coal mines and underground areas.
Category II can be further divided into II-A, II-B, and II-C, with equipment labeled II-B suitable for the conditions applicable to II-A equipment; II-C is suitable for the conditions of both II-A and II-B equipment.
Note: The II-C marking indicates a higher explosion-proof rating, but does not imply the best performance of the equipment.
No Chinese content provided.High Surface Temperatures: Electrical Equipment within the Specified RangeLargestAny part of electrical equipment that may ignite an explosive environment in adverse operating conditionsNo Chinese content provided.High temperatures.No Chinese content provided.High surface temperatures should be below flammable temperatures.
For example, if the ignition temperature of explosive gases in the explosion-proof sensor environment is 100°C, then the sensor inNo Chinese content provided.Poor working conditions may affect any component of the product.No Chinese content provided.High surface temperatures should be below 100°C.
Temperature Groups:

Gas Temperature Classification:

The explosion-proof grade of electric motors consists of three parts.

1) Different electrical equipment safety classifications in explosive gas areas (Zone 0, Zone 1, Zone 2). For example, the selection of rotating motors is categorized into explosion-proof (code d), positive pressure (p), increased safety (e), and non-sparking (n) types.

2) Classification of gas or vapor explosive mixture grades, divided into three types: ⅡA, ⅡB, and ⅡC. These classifications are mainly based onNo Chinese content provided.Large Test Safety Margin (MESG) orNo Chinese content provided.MICR is used to differentiate.

3) Classification of temperature groups for igniting certain mediums. Mainly divided into T1 - 450°C

Protection Level:

Unprotected Motors - Without specific protection, no tests are required, but should comply with Clause 2.1.

The motor with protection against solids larger than 50mm can prevent large-area accidental human contact or proximity to the shell's live or rotating parts. It also prevents solids with a diameter larger than 50mm from entering the shell.

The motor, which is designed to protect against solids larger than 12mm, prevents any foreign objects with a diameter larger than 12mm from entering the housing.

The motor is designed to prevent tools or wires with diameters greater than 2.5mm from contacting or approaching the live or rotating parts inside the housing, offering protection greater than 2.5mm.

Motor with protection against solids larger than 1MM can prevent wires or strips with a diameter or thickness greater than 1MM from contacting or approaching the live or rotating parts inside the housing.

5 Dustproof Motor - Withstands splashing from any direction without harmful effects.

Unprotected Motor; No Special Protection

1. Anti-drip motor: Vertical dripping should have no harmful effects.

At 15-degree tilt, the motor ensures that vertical dripping has no harmful effects when the motor tilts from its normal position to any angle within 15 degrees.

The motor is designed to prevent water splashes within a 60-degree angle from the vertical line, ensuring no harmful effects.

4 Splash-Proof Motor - Endures splashes from any direction without harmful effects.

5 Waterproof Motor - Withstands Water Sprays from Any Direction Without Harmful Effects

The 6 Wave-Resistant Motor: When subjected to fierce wave impacts or strong jets of water, the motor's water intake should not reach a harmful level.

7 Waterproof Motors – The motor should not allow water to enter to a harmful degree after being submerged in water at specified pressure for a designated period of time.

The 8潜水 motors are designed to operate submerged for extended periods under the specified conditions of the manufacturing plant. While typically waterproof, some models may allow water entry, but it should not reach a harmful level.

The application of protection grades in industry is generally: IP65.Please provide the Chinese content you would like translated into American English.High-end models are rated IP68, while those with IP54 protection are of a lower grade. The IP rating consists of letters and numbers, where the number 5 is the first digit and the number 4 is the second digit. The first digit indicates the level of contact protection and protection against foreign objects, while the second digit indicates the level of waterproof protection.

Four: Explosion-proof electric motor classifications - Various classification methods

1. By motor principle

Our range includes explosion-proof asynchronous motors, explosion-proof synchronous motors, and explosion-proof DC motors, among others.

2. By application location

We offer explosion-proof motors for use in underground coal mines and for factory applications.

3. By explosion-proof principle

The company offers explosion-proof motors, increased safety motors, positive pressure motors, non-sparking motors, and dust explosion-proof motors, among others.

4. By equipment category

Coal mine conveyor use explosion-proof motorsSpecial Explosion-Proof Electric Motors for Coal Mine WinchesExplosion-proof motors for rock drilling machines, local fans in coal mines, valve applications, high-noise explosion-proof fans, marine explosion-proof motors, crane and metallurgical explosion-proof motors, and brushless excitation synchronous motors for hydrogenation unit accessories. Additionally, they can be categorized by technical specifications such as rated voltage, efficiency, etc., including high-voltage explosion-proof motors, high-efficiency explosion-proof motors, high-slip ratio explosion-proof motors, and high-starting torque explosion-proof motors.

Common installation methods for explosion-proof motors include:

B3, B5, B34, and B35 installation methods.

Code B3: Bearings are for two end covers; Base: With base feet; Shafts: With shaft extensions; Mounting Type: Installed on a foundation structure.

Code B5: Bearings are for two end covers; Base: Without base feet; Shaft Extension: With shaft extension; Mounting Type: Flange mounting. Structural Features: End covers with flanges, flanges with through holes, flanges at the D end.

Code B35: Bearings for two end covers; Base: With footings; Shafts: With shaft extensions; Mounting Type: Installed on the foundation structure with the help of footings and with flange mounting. Structural Features: End covers with flanges, flanges with through holes, flanges at the D end.

Code B34: Bearings are for two end covers; Base: With base feet; Shafts: With shaft extensions; Mounting Type: Installed on foundation components using base feet, and with flange flat mounting. Structural Features: End covers with flanges, flanges with bolt holes, and a stop on the flange at the D end.