Overview of Machine Tool Wire UL MTW

by | Mar 13, 2020 | Technical Glossary

What is Machine Tool Wire (MTW)?

Machine Tool Wire, denoted as “MTW”, is used for general purpose wiring circuits, machine tool wiring and internal wiring of control panels covered under UL standard 1063. The standard describes a single conductor wire / hookup wire as well as multi-conductor cable where the conductors meet UL standard 1063 and are enclosed by a PVC jacket. These multi-approved cables are versatile in installations depending on which type of UL approval is needed – See Flexible Power and Control Cables. Constructed with a high strand count of either bare or tinned copper strands for increased corrosion protection, Machine Tool Wire (MTW) is intended to be flexible with a small bending radius for easier routing in tight spaces such as electrical cabinets. MTW wires are rated up to 600V and have a temperature rating from -25°C to 105°C.

How does Machine Tool Wire (MTW) differ from Appliance Wiring Material (AWM)?

Both are similar in that they are used for internal wiring of appliances or control cabinets, however Machine Tool Wire (MTW) is covered under UL standard 1063, a completely different standard than UL standard 758 covering Appliance Wiring Material (AWM). MTW is intended for industrial machines and control cabinets governed under NFPA 79 and NEC. There are many cable constructions for varying industries that fall under the AWM category organized by style numbers.

How does MTW differ from THHN?

THHN wire stands for Thermoplastic High Heat-resistant Nylon made with PVC, a thermoplastic material. Primarily considered a building wire, THHN wire comes in aluminum or copper, stranded or solid conductors and from 14 AWG to 1000 MCM. Machine Tool Wire (MTW) in comparison is made of stranded conductors of bare or tinned copper and offered from 22 AWG to 1000 MCM.

Your specific application will determine which approval is required and Right Hand Industrial can help with your selection.