Is type MTW conductor considered flame-retardant?

Is type MTW conductor considered flame-retardant?

• A. Yes
• B. No
• C. Only in certain applications
• D. Only when coated properly

Answer: (B)

MTW stands for Machine Tool Wire, a flexible conductor used inside machines and equipment. It is designed for 600-volt applications and rated for dry or damp locations with relatively high temperature limits. However, being flame-retardant is a specific property that requires a listed flame-retardant designation (FR, FT, or similar) on the insulation. MTW does not carry that explicit flame-retardant rating by default, so it isn’t considered flame-retardant. If a project requires wiring that resists flame or slows burning, you would choose conductors that are explicitly rated as FR.

MTW stands for Machine Tool Wire, a flexible conductor used inside machines and equipment. It is designed for 600-volt applications and rated for dry or damp locations with relatively high temperature limits. However, being flame-retardant is a specific property that requires a listed flame-retardant designation (FR, FT, or similar) on the insulation. MTW does not carry that explicit flame-retardant rating by default, so it isn’t considered flame-retardant. If a project requires wiring that resists flame or slows burning, you would choose conductors that are explicitly rated as FR.