Resolución 2535: adopta el Código Eléctrico Nacional, versión 1993. (Sustituye el Anejo A del Reglamento 4435)

(FPN): See Section 430-12(e) for grounding connection means required at motor terminal housings. (b) Separation of Junction Box from Motor. The junction box required I by (a) above shall be permitted to be separated from the motor by not more than 6 feet (1.83 m), provided the leads to the motor are Typc AC cable or armored cord or are stranded leads enclosed in liquidtight flexible metal conduit, flexible metal conduit, intermediate metal conduit, rigid metal conduit, or electrical metallic tubing not smaller than ³/₈-inch electrical trade size, the armor or raceway being connected both to the motor and to ARTICLE 430 - MOTOR CIRCUITS, CONTROLLERS 70-425 the box. Where stranded leads are used, protected as specified above, they shall not be larger than No. 10 and shall comply with other requirements of this Code for conductors to be used in raceways. Liquidtight flexible nonmetallic conduit and rigid nonmetallic conduit shall be permitted to enclose the leads to the motor provided the required grounding conductor is connected to both the motor and to the box. (c) Grounding of Controller Mounted Devices. Instrument transformer secondaries and exposed noncurrent-carrying metal or other conductive parts or cases of instrument transformers, meters, instruments, and relays shall be grounded as specified in Sections 250-121 through 250-125. M. Tables Table 430-147. Full-Load Current in Amperes, Direct-Current Motors The following values of full-load currents* are for motors running at base speed. Armature Voltage Rating* HP 90V 120V 180V 240V 500V 550V ¹/₄ 4.0 3.1 2.0 1.6 ¹/₃ 5.2 4.1 2.6 2.0 ½ 6.8 5.4 3.4 2.7 3/4 9.6 7.6 4.8 3.8 1 12.2 9.5 6.1 4.7 1½ 13.2 8.3 6.6 2 17 10.8 8.5 3 25 16 12.2 5 40 27 20 7½ 58 29 13.6 12.2 10 76 38 18 16 15 55 27 24 20 72 34 31 25 89 43 38 30 106 51 46 40 140 67 61 50 173 83 75 60 206 99 90 75 255 123 111 100 341 164 148 125 425 205 185 150 506 246 222 200 675 330 294 *These are average direct-current quantities. 70-426 NATIONAL ELECTRICAL CODE Table 430-148. Full-Load Currents in Amperes Single-Phase Alternating-Current Motors The following values of full-load currents are for motors running at usual speeds and motors with normal torque characteristics. Motors built for especially low speeds or high torques may have higher full-load currents, and multispeed motors will have full-load current varying with speed, in which case the namplate current ratings shall be used. The voltages listed are rated motor voltages. The currents listed shall be permitted for system voltage ranges of 110 to 120 and 220 to 240. HP 115V 200V 208V 230V 1/6 4.4 2.5 2.4 2.2 ¼ 5.8 3.3 3.2 2.9 ½ 7.2 4.1 4.0 3.6 ½ 9.8 5.6 5.4 4.9 3/4 13.8 7.9 7.6 6.9 1 16 9.2 8.8 8 1½ 20 11.5 11 10 2 24 13.8 13.2 12 3 34 19.6 18.7 17 5 56 32.2 30.8 28 7½ 80 46 44 40 10 100 57.5 55 50 ARTICLE 430 - MOTOR CIRCUITS, CONTROLLERS 70-427 Table 430-149. Full-Load Current Two-Phase Alternating-Current Motors (4-Wire) The following values of full-load current are for motors running at speeds usual for belted motors and motors with normal torque characteristics. Motors built for especially low speeds or high torques may require more running current, and multispeed motors will have full-load current varying with speed, in which case the nameplate current rating shall be used. Current in the common conductor of a 2-phase, 3-wire system will be 1.41 times the value given. The voltages listed are rated motor voltages. The currents listed shall be permitted for system voltage ranges of 110 to 120, 220 to 240, 440 to 480, and 550- 600 volts. Induction Type Squirrel-Cage and Wound-Rotor Amperes HP 115V 230V 460V 575V 2300V ½ 4 2 1 .8 3/4 4.8 2.4 1.2 1.0 1 6.4 3.2 1.6 1.3 1½ 9 4.5 2.3 1.8 2 11.8 5.9 3 2.4 3 8.3 4.2 3.3 5 13.2 6.6 5.3 7½ 19 9 8 10 24 12 10 15 36 18 14 20 47 23 19 25 59 29 24 30 69 35 28 40 90 45 36 50 113 56 45 60 133 67 53 14 75 166 83 66 18 100 218 109 87 23 125 270 135 108 28 150 312 156 125 32 200 416 208 167 43 70-428 NATIONAL ELECTRICAL CODE Table 430-150. Full-Load Current* Three-Phase Alternating-Current Motors Induction Type Synchronous Type Squirrel-Cage and Wound-Rotor Unity Power Factort Amperes Amperes HP 115V 200V 208V 230V 460V 575V 2300V 230V 460V 575V 2300V ½ 4 2.3 2.2 2 1 .8 3/4 5.6 3.2 3.1 2.8 1.4 1.1 1 7.2 4.1 4.0 3.6 1.8 1.4 1½ 10.4 6.0 5.7 5.2 2.6 2.1 2 13.6 7.8 7.5 6.8 3.4 2.7 3 11.0 10.6 9.6 4.8 3.9 5 17.5 16.7 15.2 7.6 6.1 7½ 25.3 24.2 22 11 9 10 32.2 30.8 28 14 11 15 48.3 46.2 42 21 17 20 62.1 59.4 54 27 22 25 78.2 74.8 68 34 27 53 26 21 30 92 88 80 40 32 63 32 26 40 119.6 114.4 104 52 41 83 41 33 50 149.5 143.0 130 65 52 104 52 42 60 177.1 169.4 154 77 62 16 123 61 49 12 75 220.8 211.2 192 96 77 20 155 78 62 15 100 285.2 272.8 248 124 99 26 202 101 81 20 125 358.8 343.2 312 156 125 31 253 126 101 25 150 414 396.0 360 180 144 37 302 151 121 30 200 552 528.0 480 240 192 49 400 201 161 40 *These values of full-load current are for motors running at speeds usual for belted motors and motors with normal torque characteristics. Motors built for especially low speeds or high torques may require more runnning current, and multispeed motors will have full-load current varying with speed, in which case the nameplate current rating shall be used. +For 90 and 80 percent power factor, the above figures shall be multipled by 1.1 and 1.25 respectively. The voltages listed are rated motor voltages. The currents listed shall be permitted for system voltage ranges of 110 to 120, 220 to 240, 440 to 480, and 550 to 600 volts. ARTICLE 430 - MOTOR CIRCUITS, CONTROLLERS 70-429 Table 430-151. Conversion Table of Locked-Rotor Currents for Selection of Disconnecting Means and Controllers as Determined from Horsepower and Voltage Rating For use only with Sections 430-110, 440-12, 440-41, and 455-8(c). Motor Locked-Rotor Current Amperes* Single Phase Two or Three Phase Max. HP 115V 230V 115V 200V 230V 460V 575V Rating 58.8 29.4 24 18.8 12 6 4.8 1/2 82.8 41.4 33.6 19.3 16.8 8.4 6.6 3/4 96 48 43.2 24.8 21.6 10.8 8.4 1 120 60 62 35.9 31.2 15.6 12.6 1½ 144 72 81 46.9 40.8 20.4 16.2 2 204 102 - 66 58 26.8 23.4 3 336 168 - 105 91 45.6 36.6 5 480 240 - 152 132 66 54 7½ 600 300 - 193 168 84 66 10 - - - 290 252 126 102 15 - - - 373 324 162 132 20 - - - 469 408 204 162 25 - - - 552 480 240 192 30 - - - 718 624 312 246 40 - - - 897 780 390 312 50 - - - 1063 924 462 372 60 - - - 1325 1152 576 462 75 - - - 1711 1488 744 594 100 - - - 2153 1872 936 750 125 - - - 2484 2160 1080 864 150 - - - 3312 2880 1440 1152 200 *These values of motor locked-rotor current are approximately six times the full-load current values given in Tables 430-148 and 430-150. 70-430 NATIONAL ELECTRICAL CODE 430-152. Maximum Rating or Setting of Motor Branch-Circuit Short-Circuit and Ground-Fault Protective Devices Percent of Full-Load Current Dual Element Instan- Nontime (Timetaneous Inverse Delay Delay) Trip Time Type of Motor Fuse Fuse Breaker Breaker* Single-phase, all types No code letter 300 175 700 250 All ac single-phase and polyphase squirrel-cage and synchronous motorst with fullvoltage, resistor or reactor starting: No code letter 300 175 700 250 Code letters F to V 300 175 700 250 Code letters B to E 250 175 700 200 Code letter A 150 150 700 150 All ac squirrel-cage and synchronous motorst with autotransformer starting: Not more than 30 amps No code letter 250 175 700 200 More than 30 amps No code letter 200 175 700 200 Code letters F to V 250 175 700 200 Code letters B to E 200 175 700 200 Code letter A 150 150 700 150 High reactance squirrel-cage Not more than 30 amps No code letter 250 175 700 250 More than 30 amps No code letter 200 175 700 200 Wound-rotor - No code letter 150 150 700 150 Direct-current (constant voltage) No more than 50 hp No code letter 150 150 250 150 More than 50 hp No code letter 150 150 175 150 For explanation of code letter marking, see Table 430-7(b). For certain exceptions to the values specified, see Sections 430-52 through 430-54. *The values given in the last column also cover the ratings of nonadjustable inverse time types of circuit breakers that may be modified as in Section 430-52. +Synchronous motors of the low-torque, low-speed type (usually 450 rpm or lower), such as are used to drive reciprocating compressors, pumps, etc., that start unloaded, do not require a fuse rating or circuit-breaker setting in excess of 200 percent of full-load current.