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The differences between AWM and MTW

Definition and Usage

1. AWM (Appliance Wiring Material)

o Definition: It refers to the wiring material designed for electrical appliances.

o Usage: It is commonly used for interconnecting sensors, actuators, switches, and other components within electrical appliances. AWM wires are also frequently utilized as external connection wires between appliances.

2. MTW (Thermoplastic insulated machine tool wire)

o Definition: It is a type of wire specifically insulated with thermoplastic and intended for use in machine tools.

o Usage: It is primarily used for internal wiring in electrical appliances, particularly in those requiring high levels of fire safety. MTW wires are commonly found in refrigeration equipment, automatic washing machines, air conditioning units, machine tool control systems, and various construction machinery control systems.

Standards and Certifications

1. AWM

o Standard: Complies with the UL758 standard, which is the only global standard for AWM wires established by UL (Underwriters Laboratories).
o Certification: Typically carries a UL Listed certification.

2. MTW

o Standard: Produced according to the UL1063 standard, which is the standard for machine tool wires. It also meets the electrical requirements of the NFPA 79 standard.
o Certification: Often comes with UL Listed certification to ensure compliance with NFPA 79 electrical codes.

Physical Characteristics

1. AWM: Generally characterized by its specific design and materials tailored for appliance wiring.

2. MTW: Typically features larger copper conductors and more plastic insulation than wires rated for 300V. It is constructed with stranded conductors for better flexibility. MTW wires are also known for their robust and wear-resistant polyvinyl chloride (PVC) insulation or PVC/nylon insulation.

Operating Temperatures

1. AWM: Operating temperatures may vary depending on the specific application and type of insulation.

2. MTW: In dry environments, it can operate at temperatures up to 90°C (194°F). When exposed to moisture, oil, or coolants, its operating temperature is reduced to 60°C (140°F).

Flame Resistance and Oil Resistance

MTW: Often has a flame resistance rating of VW-1 or higher and an oil resistance rating of I, making it suitable for a wider range of applications requiring high levels of safety and durability. In summary, AWM and MTW wires differ significantly in their definitions, usage, standards, certifications, physical characteristics, operating temperatures, and flame and oil resistance ratings. When selecting the appropriate wire for a specific application, it is important to consider all these factors to ensure compliance with safety standards and optimal performance.