Facts & Figures Book - KPI-JCI

MOTOR WIRING AT STANDARD SPEEDS, (Continued)From National Electrical Code==Min. **Max. ==Min. **MaxFull Size Size Rating Full Size Size RatingLoad Wire Con- of Load Wire Con- ofHP. Amp. AWG duit Branch Amp. AWG duit BranchPer Rubber in Circuit Per Rubber in CircuitPhase Covered Inches Fuses Phase Covered Inches FusesDIRECT CURRENT MOTORS115 Volts 230 Volts1 8.4 14 1⁄2 15 4.2 14 1⁄2 151 1 ⁄2 12.5 12 1⁄2 20 6.3 14 1⁄2 152 16.1 10 3⁄4 25 8.3 14 1⁄2 153 23 8 3⁄4 35 12.3 12 1⁄2 205 40 6 1 60 19.8 10 3⁄4 307 1 ⁄2 58 3 1 1 ⁄4 90 28.7 6 1 4510 75 1 1 1 ⁄2 125 38 6 1 6015 112 00 2 175 56 4 1 1 ⁄4 9020 140 000 2 225 74 1 1 1 ⁄2 12525 184 300 ‡ 2 1 ⁄2 300 92 0 2 15030 220 400 ‡ 3 350 110 00 2 17540 292 700 ‡ 3 1 ⁄2 450 146 0000 2 1 ⁄2 22550 360 1000 ‡ 4 600 180 300 ‡ 2 1 ⁄2 30060 215 400 ‡ 3 35075 268 600 ‡ 3 1 ⁄2 450100 355 1000 ‡ 4 600‡==***=206M.C.M.In order to avoid excessive voltage drop where long runs are involved, it may benecessary to use conductors and conduit of sizes larger than the minimum sizes listedabove.Branch-circuit fuses must be large enough to carry the starting current, hence theyprotect against short-circuit only. Additional protection of an approved type must beprovided to protect each motor against normal operating overloads.For full-voltage starting of normal torque, normal starting current motor.For reduced-voltage starting of normal torque, normal starting current motor, and forfull-voltage starting of high-reactance, low starting current squirrel-cage motors.NEMA Frame Numbers for Polyphase Induction Motors“T” FrameHorsepower 1800 RPM 1200 RPM2 145T 184T3 182T 213T5 184T 215T7 1 ⁄2 213T 254T10 215T 256T15 254T 284T20 256T 286T25 284T 324T30 286T 326T40 324T 364T50 326R 365T60 364T 404T75 365T 405T