Title 30: Mineral Resources
PART 18—ELECTRIC MOTOR-DRIVEN MINE EQUIPMENT AND ACCESSORIES
Subpart D—Machines Assembled With Certified or Explosion-Proof Components, Field Modifications of Approved Machines, and Permits To Use Experimental Equipment
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Appendix I to Subpart D of Part 18
LIST OF TABLES------------------------------------------------------------------------ Table No. Title------------------------------------------------------------------------ 1 Portable power cable ampacities_600 volts. 2 Portable cord ampacities_600 volts. 3 Portable power cable ampacities_601 to 5,000 volts. 4 Normal diameter of round cables with tolerances in inches_600 volts. 5 Nominal dimension of flat cables with tolerances in inches_600 volts. 6 Nominal diameter of heavy jacketed cords with tolerances in inches_600 volts. 7 Nominal diameter of three-conductor portable power cables with tolerances in inches_601 to 5,000 volts. 8 Fuse ratings or instantaneous settings of circuit breakers for short-circuit protection of portable cables. 9 Specifications for portable cables longer than 500 feet.------------------------------------------------------------------------
Table 1_Portable Power Cable Ampacities_600 Volts (Amperes Per Conductor Based on 60 °C. Copper Temperature_40 °C. Ambient)---------------------------------------------------------------------------------------------------------------- 2- 3- Single conductor, conductor, Conductor size_AWG or MCM conductor round or round or 4-conductor 5-conductor 6-conductor flat flat----------------------------------------------------------------------------------------------------------------8................................. 45 40 35 30 25 206................................. 60 50 50 40 35 304................................. 85 70 65 55 45 353................................. 95 80 75 65 55 452................................. 110 95 90 75 65 551................................. 130 110 100 85 75 651/0............................... 150 130 120 100 90 802/0............................... 175 150 135 115 105 953/0............................... 205 175 155 130 120 1104/0............................... 235 200 180 150 140 130250............................... 275 220 200 160 ........... ...........300............................... 305 240 220 175 ........... ...........350............................... 345 240 235 190 ........... ...........400............................... 375 280 250 200 ........... ...........450............................... 400 300 270 215 ........... ...........500............................... 425 320 290 230 ........... ...........----------------------------------------------------------------------------------------------------------------
Table 2_Portable Cord Ampacities_600 Volts (Amperes Per Conductor Based on 60 °C. Copper Temperature_40 °C. Ambient)---------------------------------------------------------------------------------------------------------------- Conductor size_AWG 1-3 conductor 4-6 conductor 7-9 conductor----------------------------------------------------------------------------------------------------------------14......................................... 15 12 812......................................... 20 16 1110......................................... 25 20 14----------------------------------------------------------------------------------------------------------------
Table 3_Portable Power Cable Ampacities_601 to 5,000 Volts (Amperes Per Conductor Based on 75 °C. Copper Temperature_40 °C. Ambient)---------------------------------------------------------------------------------------------------------------- 3-conductor types G-GC and SIIC-GC 3-conductor type SHD-GC 2,001-5,000 Conductor size_AWG or MCM 2,000 volts volts----------------------------------------------------------------------------------------------------------------6............................. 65 654............................. 85 853............................. 100 1002............................. 115 1151............................. 130 1301/0........................... 145 1452/0........................... 170 1703/0........................... 195 1954/0........................... 220 220250........................... 245 245300........................... 275 275350........................... 305 305----------------------------------------------------------------------------------------------------------------
Table 4_Nominal Diameters of Round Cables With Tolerances in Inches_600 Volts-------------------------------------------------------------------------------------------------------------------------------------------------------- 2-conductor 3-conductor 6-conductor ------------------------------------------------------- ------------------- Type 4- 5- Conductor size_AWG or MCM Single Types W Type Type Type PCG, 3 conductor_Types conductor_Types conductor & G PG, 2 PCG, 3 Types W PG, 3 power, 2 W & G W & G Type w Tolerance twisted power power, & G power, control, ground ground ground--------------------------------------------------------------------------------------------------------------------------------------------------------8............................... 0.44 0.81 0.84 0.94 0.91 0.93 1.03 0.99 1.07 1.18 ±0 .036............................... .51 .93 .93 .98 1.01 1.03 1.18 1.10 1.21 1.31 ±. 034............................... .57 1.08 1.08 1.10 1.17 1.20 1.29 1.27 1.40 1.52 ±. 033............................... .63 1.17 1.17 1.20 1.24 1.27 1.31 1.34 1.48 1.61 ±. 032............................... .66 1.27 1.27 1.29 1.34 1.34 1.39 1.48 1.61 1.75 ±. 031............................... .74 1.44 1.44 1.44 1.51 1.52 1.52 1.68 1.88 2.05 ±. 031/0............................. .77 1.52 1.52 1.52 1.65 1.68 1.68 1.79 1.96 2.13 ±. 042/0............................. .82 1.65 1.65 1.65 1.75 1.79 1.79 1.93 2.13 2.32 ±. 043/0............................. .87 1.77 1.77 1.77 1.89 1.93 1.93 2.07 2.26 2.49 ±. 054/0............................. .93 1.92 1.92 1.92 2.04 2.13 2.13 2.26 2.46 2.71 ±. 05250............................. 1.03 2.16 2.16 2.16 2.39 2.39 2.39 2.66 ............... ....... ±. 06300............................. 1.09 2.32 ....... ....... 2.56 ....... ........ 2.84 ............... ....... ±. 06350............................. 1.15 2.43 ....... ....... 2.68 ....... ........ 2.98 ............... ....... ±. 06400............................. 1.20 2.57 ....... ....... 2.82 ....... ........ 3.14 ............... ....... ±. 06450............................. 1.26 2.67 ....... ....... 2.94 ....... ........ 3.26 ............... ....... ±. 06500............................. 1.31 2.76 ....... ....... 3.03 ....... ........ 3.40 ............... ....... ±. 06--------------------------------------------------------------------------------------------------------------------------------------------------------
Table 5_Nominal Dimensions of Flat Cables With Tolerances in Inches_600 Volts-------------------------------------------------------------------------------------------------------------------------------------------------------- 2-conductor 3-conductor_Type G ----------------------------------------------------------------------------------------------------------------------- Type W Type G Major Minor Conductor size_AWG ----------------------------------------------------------------------------------------------------------------------- Major Minor Major Minor -------------------------------------------------------------------------------- O.D. Tolerance O.D. Tolerance O.D. Tolerance O.D. Tolerance O.D. Tolerance O.D. Tolerance--------------------------------------------------------------------------------------------------------------------------------------------------------8............................... 0.84 ±0 0.51 ±0 .04 .036............................... .93 ±. .56 ±. 1.02 ±. 0.56 ±. 1.65 ±0 0.67 ±0 04 03 04 03 .06 .054............................... 1.05 ±. .61 ±. 1.15 ±. .61 ±. 1.85 ±. .75 ±. 04 03 04 03 06 053............................... 1.14 ±. .68 ±. 1.26 ±. .68 ±. 1.99 ±. .77 ±. 04 03 04 03 06 052............................... 1.24 ±. .73 ±. 1.35 ±. .73 ±. 2.10 ±. .81 ±. 04 03 04 06 06 051............................... 1.40 ±. .81 ±. 1.55 ±. .81 ±. 2.43 ±. .97 ±. 04 03 04 03 06 051/0............................. 1.51 ±. .93 ±. 1.67 ±. .93 ±. 04 03 04 032/0............................. 1.63 ±. .99 ±. 1.85 ±. .99 ±. 04 03 04 033/0............................. 1.77 ±. 1.03 ±. 2.00 ±. 1.03 ±. 04 03 04 034/0............................. 1.89 ±. 1.10 ±. 2.10 ±. 1.10 ±. 04 03 04 03--------------------------------------------------------------------------------------------------------------------------------------------------------
Table 6_Nominal Diameters of Heavy Jacketed Cords With Tolerances In Inches_600 Volts------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ 2-conductor 3-conductor 4-conductor 5-conductor 6-conductor 7-conductor Conductor size_AWG ----------------------------------------------------------------------------------------------------------------------------- Diameter Tolerance Diameter Tolerance Diameter Tolerance Diameter Tolerance Diameter Tolerance Diameter Tolerance------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------14................................................................ 0.64 ±0 0.67 ±0 0.71 ±0 0.78 ±0 0.83 ±0 0.89 ±0 .02 .02 .02 .03 .03 .0312................................................................ .68 ±. .72 ±. .76 ±. .83 ±. .89 ±. .98 ±. 02 03 03 03 03 0310................................................................ .73 ±. .80 ±. .84 ±. .90 ±. 1.00 ±. 1.07 ±. 03 03 03 03 03 03------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Table 7_Nominal Diameters of Three-Conductor Portable Power Cables With Tolerances in Inches_601 to 5,000 Volts-------------------------------------------------------------------------------------------------------------------------------------------------------- Type G-GC Type SHC-GC (shielded Type SHD-GC Type SHD-GC (nonshielded) 2,000 overall) 2,000 volts (individually (individually volts ----------------------- shielded power shielded power Conductor size_AWG or MCM ----------------------- conductors) 2,001- conductors) 3,001- 3,000 volts 5,000 volts Diameter Tolerance Diameter Tolerance --------------------------------------------- Diameter Tolerance Diameter Tolerance--------------------------------------------------------------------------------------------------------------------------------------------------------6........................................................... 1.25 +0.10, - 1.39 +0.11, - 1.62 +0.13, - 1.78 +0.14, - 0.06 0.07 0.08 0.094........................................................... 1.40 +.11, -.07 1.55 +.12, -.08 1.77 +.14, -.09 1.90 +.15, -.103........................................................... 1.48 +.12, -.07 1.62 +.13, -.08 1.84 +.15, -.09 1.98 +.16, -.102........................................................... 1.55 +.12, -.08 1.71 +.14, -.09 1.92 +.15, -.10 2.09 +.17, -.111........................................................... 1.74 +.14, -.09 1.89 +.15, -.09 2.04 +.16, -.10 2.18 +.17, -.111/0......................................................... 1.84 +.15, -.09 2.02 +.16, -.10 2.18 +.17, -.11 2.34 +.19, -.122/0......................................................... 1.99 +.16, -.10 2.16 +.17, -.11 2.29 +.18, -.12 2.46 +.20, -.123/0......................................................... 2.12 +.17, -.11 2.30 +.18, -.11 2.45 +.20, -.12 2.62 +.21, -.134/0......................................................... 2.30 +.18, -.12 2.48 +.20, -.12 2.62 +.21, -.13 2.76 +.22, -.14250......................................................... 2.46 +.20, -.12 2.70 +.22, -.13 ........ ........... ........ ...........300......................................................... 2.63 +.21, -.13 2.84 +.23, -.14 ........ ........... ........ ...........350......................................................... 2.75 +.22, -.14 2.97 +.24, -.15 ........ ........... ........ ...........--------------------------------------------------------------------------------------------------------------------------------------------------------
Table 8_Fuse Ratings or Instantaneous Setting of Circuit Breakers for Short-Circuit Protection of Portable Cables and Cords-------------------------------------------------------------------------------------------------------------------------------------------------------- Maximum allowable circuit Conductor size_AWG or MCM Ohms/1,000 ft. at 25 °C. Maximum allowable fuse breaker instantaneous rating (amperes) setting (amperes) \1\--------------------------------------------------------------------------------------------------------------------------------------------------------14............................................................ 2.62 20 5012............................................................ 1.65 30 7510............................................................ 1.04 40 1508............................................................. .654 80 2006............................................................. .410 100 3004............................................................. .259 200 5003............................................................. .205 250 6002............................................................. .162 300 8001............................................................. .129 375 1,0001/0........................................................... .102 500 1,2502/0........................................................... .081 ............................ 1,5003/0........................................................... .064 ............................ 2,0004/0........................................................... .051 ............................ 2,500250........................................................... .043 ............................ 2,500300........................................................... .036 ............................ 2,500350........................................................... .031 ............................ 2,500400........................................................... .027 ............................ 2,500450........................................................... .024 ............................ 2,500500........................................................... .022 ............................ 2,500--------------------------------------------------------------------------------------------------------------------------------------------------------\1\ Higher circuit-breaker settings may be permitted for special applications when justified.
Table 9_Specifications for Portable Cables Longer Than 500 Feet \1\-------------------------------------------------------------------------------------------------------------------------------------------------------- Normal ampacity at 60 Conductor size_AWG or MCM Max. allowable length (feet) °C. copper temperature Resistance at 60 °C. (40 °C. ambient) copper temperature (ohms)--------------------------------------------------------------------------------------------------------------------------------------------------------6............................................................. 550 50 0.5124............................................................. 600 70 .3533............................................................. 650 80 .3022............................................................. 700 95 .2581............................................................. 750 110 .2201/0........................................................... 800 130 .1852/0........................................................... 850 150 .1573/0........................................................... 900 175 .1304/0........................................................... 1,000 200 .116250........................................................... 1,000 220 .098300........................................................... 1,000 240 .082350........................................................... 1,000 260 .070400........................................................... 1,000 280 .061450........................................................... 1,000 300 .054500........................................................... 1,000 320 .050--------------------------------------------------------------------------------------------------------------------------------------------------------\1\ Fuses shall not be used for short-circuit protection of these cables. Circuit breakers shall be used with the instantaneous trip settings not to exceed the values given in Table 8.
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[33 FR 4660, Mar. 19, 1968; 33 FR 6345, Apr. 26, 1968, as amended at 42 FR 8373, Feb. 10, 1977]
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