MTW wire sizes 10, 12, 14, 16, 18 AWG and now 20 AWG are available. Type MTW conductors are primarily used in control cabinets, in machine tool applications and in appliance wiring applications at temperatures from -25°C to 105°C. MTW wire complies with the National Electrical Code (NEC) and NFPA Standard 79. Voltage rating for all applications is 600 volts. New Striped MTW wire with color-coded PVC heat and moisture-resistant insulating jackets is also now available in 20 AWG. White with blue striped wire is generally used for DC circuit conductors, white with orange stripes is used to indicate AC circuit conductors that remain energized when the main supply circuit is off, and green with or without yellow stripes is used to identify the equipment grounding conductor. 20 AWG MTW wire is sold in 500 foot spools starting at $25.00.