Machine Tool Wire Ampacity

Why does mtw wire have a higher ampacity rating than standard stranded wire.

Machine tool wire ampacity. Conductor sizes 18 awg through 2 awg. Diameter min color put up reel reel size put up barrel 12. Weighing approximately 951 lbs mft these wires are rated for up to 600 volts and have different maximum temperature ratings. Is the higher ampacity determined by the physical characteristics or because the wiring is mostly run inside of control enclosures.

Our selection of mtw bare copper and tew tinned copper presents the best wire options for every function. Certain sizes and colors are also available in 2500 foot reels. Mtw wire tew wire pass the vw 1 flame test and are also moisture resistant. Where would i find ampacity tables for machine tool wire mtw other than in nfpa 79 1997.

Voltage rating for all applications is 600 volts. 10 12 and 14awg are 19 strands all others are highly flexible stranding constructions. Encore wire corporation size awg type mtw 600 volts gr i vw 1 ul or awm or c ul type tew ft1 listed. The above data is approximate and subject to normal manufacturing tolerances.

Machine tool wire mtw consists of stranded soft annealed copper conductors insulated with polyvinylchloride pvc. Of strands insulation thickness overall diameter net weight awg kcm inches mm lbs kft 18strmtw 18 16 0 030 0 76 0 113 2 87 11 16strmtw 16 26 0 030 0 76 0 125 3 18 14 14strmtw 14 41 0 030 0 76 0 139 3 53 20. 2 sizes 18 awg 16 awg. Mtw wire is sold in 500 foot spools.

Mtw is ul rated for 600 volts. Badger wire cables machine tool wire. For use in accordance with the national jacket electrical code nec and nfpa standard 79. Applications for machine tool wire include use with switchboards appliances electronic circuits and control cabinets and of course the wiring of machine tools.

Mtw stands for machine tool wire and as the name implies its primary uses are related to the wiring of machine tools appliances and control cabinets. Allowable ampacities of insulated conductors rated up to and including 2000 volts 60 c through 90 c 140 f through 194 f not more than three current carrying conductors in raceway cable or earth directly buried based on ambient temperature of 30 c 86 f. Wdt id gauge construction temp volt flame rating tinned copper stranding nom. Ampacities are based on table 310 15 b 16 of the nec 2014 edition.

Control cabinets in machine tool applica tions and in appliance wiring applications.