Machine Tool Wire Ampacity

Ampacities are based on table 310 15 b 16 of the nec 2014 edition.

Machine tool wire ampacity. For use in accordance with the national jacket electrical code nec and nfpa standard 79. Wdt id gauge construction temp volt flame rating tinned copper stranding nom. Our selection of mtw bare copper and tew tinned copper presents the best wire options for every function. Applications for machine tool wire include use with switchboards appliances electronic circuits and control cabinets and of course the wiring of machine tools.

Weighing approximately 951 lbs mft these wires are rated for up to 600 volts and have different maximum temperature ratings. Control cabinets in machine tool applica tions and in appliance wiring applications. Why does mtw wire have a higher ampacity rating than standard stranded wire. Where would i find ampacity tables for machine tool wire mtw other than in nfpa 79 1997.

The above data is approximate and subject to normal manufacturing tolerances. 2 sizes 18 awg 16 awg. 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. Ampacity based on nfpa 79 table 12 5 1 for use with industrial machinery applications.

Certain sizes and colors are also available in 2500 foot reels. Mtw is ul rated for 600 volts. It is a pvc hookup wire and although machine tool wire is qualified for many wiring applications it is a simply constructed wire that is made up of a highly stranded bare copper conductor. Mtw wire is sold in 500 foot spools.

Diameter min color put up reel reel size put up barrel 12. Conductor sizes 18 awg through 2 awg. Mtw wire tew wire pass the vw 1 flame test and are also moisture resistant. Mtw is a machine tool wire with a bare copper conductor and pvc insulation that is available in a variety of colors for identification purposes.

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. 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. Encore wire corporation size awg type mtw 600 volts gr i vw 1 ul or awm or c ul type tew ft1 listed.

Is the higher ampacity determined by the physical characteristics or because the wiring is mostly run inside of control enclosures.