What Is MTW Wire?
MTW stands for Machine Tool Wire, a type of hook-up and lead wire specifically designed for use in the internal wiring of industrial machinery, control panels, and manufacturing equipment. MTW wire features a flexible construction and thermoplastic insulation, making it ideal for applications that require frequent movement or tight routing. It is commonly used in both wet and dry environments and must meet strict safety and flame-retardance requirements.
MTW wire is UL-listed and compliant with the National Electrical Code (NEC), often overlapping with other ratings like AWM (Appliance Wiring Material) and THWN-2, depending on the insulation type.
Where Is MTW Wire Used?
MTW wire is widely used across industrial and commercial sectors, including:
- Machine Tool Assemblies
- Automated Control Panels
- Conveyor Systems
- Robotics and CNC Equipment
- Switchboards and Motor Controls
Its flexibility, oil-resistance, and thermal stability make it a go-to solution for wiring that experiences constant flexing or is installed in confined spaces.
Explore more MTW applications and solutions on our Data Centers page.
What Are the Key Features of MTW Wire?
- Voltage Rating: Typically rated for 600V
- Temperature Rating: Up to 90°C in dry conditions and 60°C in wet environments
- Insulation Material: PVC (Polyvinyl Chloride)
- Flame-Retardant: Meets FT1/UL VW-1 standards
- Oil-Resistant: Suitable for industrial environments
- Highly Flexible: Facilitates installation in machinery with moving parts
MTW Wire vs. THHN and AWM
While MTW wire shares similarities with THHN (Thermoplastic High Heat-Resistant Nylon-coated) and AWM, it is specifically rated for use in machinery and must meet additional flex and durability standards. THHN may be used in building wiring, while MTW is tailored for tighter, industrial equipment environments.
Some wires carry dual or triple ratings (e.g., MTW/THWN/AWM) allowing them to serve multiple purposes and simplify inventory.
Cable Compliance and Standards
MTW wire is typically compliant with:
- UL 1063: Machine Tool Wire Standard
- CSA TEW: Canadian Equivalent
- NFPA 79: Electrical Standard for Industrial Machinery
- RoHS: Restrictions on Hazardous Substances
Frequently Asked Questions
What gauge sizes are available for MTW wire?
Common sizes range from 22 AWG to 500 MCM, depending on the application and load requirements.
Is MTW wire suitable for wet environments?
Yes, MTW wire is rated for use in wet locations up to 60°C, provided it carries the appropriate UL listings.
Can MTW wire be used in place of THHN?
Only in certain situations. While MTW and THHN may overlap, MTW is preferred for machinery and flex-heavy environments. Dual-rated wires may satisfy both applications.
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