LIST OF FIGURES
Figure
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)
+------------------+-----------+---------------+---------------+-----------+-----------+-----------+
| Conductor size-- | Single | 2-conductor, | 3-conductor, | 4- | 5- | 6- |
| AWG or MCM | conductor | round or flat | round or flat | conductor | conductor | conductor |
+------------------+-----------+---------------+---------------+-----------+-----------+-----------+
| 8................| 45 | 40 | 35 | 30 | 25 | 20 |
| 6................| 60 | 50 | 50 | 40 | 35 | 30 |
| 4................| 85 | 70 | 65 | 55 | 45 | 35 |
| 3................| 95 | 80 | 75 | 65 | 55 | 45 |
| 2................| 110 | 95 | 90 | 75 | 65 | 55 |
| 1................| 130 | 110 | 100 | 85 | 75 | 65 |
| 1/0..............| 150 | 130 | 120 | 100 | 90 | 80 |
| 2/0..............| 175 | 150 | 135 | 115 | 105 | 95 |
| 3/0..............| 205 | 175 | 155 | 130 | 120 | 110 |
| 4/0..............| 235 | 200 | 180 | 150 | 140 | 130 |
| 250..............| 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-- | 1-3 | 4-6 | 7-9 |
| | conductor | conductor | conductor |
+------------------+-----------+-----------+-----------+
| 14...............| 15 | 12 | 8 |
| 12...............| 20 | 16 | 11 |
| 10...............| 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 | 3- |
| | types G- | conductor |
| Conductor size--AWG or MCM | GC and | type SHD- |
| | SIIC-GC | GC 2,001- |
| | 2,000 volts | 5,000 volts |
+----------------------------+-------------+-------------+
| 6..........................| 65 | 65 |
| 4..........................| 85 | 85 |
| 3..........................| 100 | 100 |
| 2..........................| 115 | 115 |
| 1..........................| 130 | 130 |
| 1/0........................| 145 | 145 |
| 2/0........................| 170 | 170 |
| 3/0........................| 195 | 195 |
| 4/0........................| 220 | 220 |
| 250........................| 245 | 245 |
| 300........................| 275 | 275 |
| 350........................| 305 | 305 |
+----------------------------+-------------+-------------+
TABLE 4--NOMINAL DIAMETERS OF ROUND CABLES
WITH TOLERANCES IN INCHES--600 VOLTS
+-----------+-----------+--------------------------+-----------------------------+---------------+---------------+----------------------+
| | | 2-conductor | 3-conductor | | | 6-conductor |
| | |----------|--------|---------|--------|---------|-------------| | |-----------|------------|
| | | | | | | | Type | | | | |
| Conductor | Single | Types | Type | Type | Type | Type | PCG, 3 | 4-conductor-- | 5-conductor-- | | |
| size--AWG | conductor | W & G | PG, 2 | PCG, 3 | W & G | PG, 3 | power, | Types W & G | Types W & G | Type w | Tolerance |
| or MCM | | twisted | power | power, | | power, | 2 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 | ±0.03 |
| 6.........| .51 | .93 | .93 | .98 | 1.01 | 1.03 | 1.18 | 1.10 | 1.21 | 1.31 | ±.03 |
| 4.........| .57 | 1.08 | 1.08 | 1.10 | 1.17 | 1.20 | 1.29 | 1.27 | 1.40 | 1.52 | ±.03 |
| 3.........| .63 | 1.17 | 1.17 | 1.20 | 1.24 | 1.27 | 1.31 | 1.34 | 1.48 | 1.61 | ±.03 |
| 2.........| .66 | 1.27 | 1.27 | 1.29 | 1.34 | 1.34 | 1.39 | 1.48 | 1.61 | 1.75 | ±.03 |
| 1.........| .74 | 1.44 | 1.44 | 1.44 | 1.51 | 1.52 | 1.52 | 1.68 | 1.88 | 2.05 | ±.03 |
| 1/0.......| .77 | 1.52 | 1.52 | 1.52 | 1.65 | 1.68 | 1.68 | 1.79 | 1.96 | 2.13 | ±.04 |
| 2/0.......| .82 | 1.65 | 1.65 | 1.65 | 1.75 | 1.79 | 1.79 | 1.93 | 2.13 | 2.32 | ±.04 |
| 3/0.......| .87 | 1.77 | 1.77 | 1.77 | 1.89 | 1.93 | 1.93 | 2.07 | 2.26 | 2.49 | ±.05 |
| 4/0.......| .93 | 1.92 | 1.92 | 1.92 | 2.04 | 2.13 | 2.13 | 2.26 | 2.46 | 2.71 | ±.05 |
| 250.......| 1.03 | 2.16 | 2.16 | 2.16 | 2.39 | 2.39 | 2.39 | 2.66 |...............|..........| ±.06 |
| 300.......| 1.09 | 2.32 |.......|........| 2.56 |........|............| 2.84 |...............|..........| ±.06 |
| 350.......| 1.15 | 2.43 |.......|........| 2.68 |........|............| 2.98 |...............|..........| ±.06 |
| 400.......| 1.20 | 2.57 |.......|........| 2.82 |........|............| 3.14 |...............|..........| ±.06 |
| 450.......| 1.26 | 2.67 |.......|........| 2.94 |........|............| 3.26 |...............|..........| ±.06 |
| 500.......| 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 |
| |--------------------------------------|--------------------------------------|-------------------|-------------------|
| Conductor | Type W | Type G | Major | Minor |
| 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 | ±0.04 | 0.51 | ±0.03 |......|...........|......|...........|......|...........|......|...........|
| 6 | .93 | ±.04 | .56 | ±.03 | 1.02 | ±.04 | 0.56 | ±.03 | 1.65 | ±0.06 | 0.67 | ±0.05 |
| 4 | 1.05 | ±.04 | .61 | ±.03 | 1.15 | ±.04 | .61 | ±.03 | 1.85 | ±.06 | .75 | ±.05 |
| 3 | 1.14 | ±.04 | .68 | ±.03 | 1.26 | ±.04 | .68 | ±.03 | 1.99 | ±.06 | .77 | ±.05 |
| 2 | 1.24 | ±.04 | .73 | ±.03 | 1.35 | ±.04 | .73 | ±.06 | 2.10 | ±.06 | .81 | ±.05 |
| 1 | 1.40 | ±.04 | .81 | ±.03 | 1.55 | ±.04 | .81 | ±.03 | 2.43 | ±.06 | .97 | ±.05 |
| 1/0 | 1.51 | ±.04 | .93 | ±.03 | 1.67 | ±.04 | .93 | ±.03 |......|...........|......|...........|
| 2/0 | 1.63 | ±.04 | .99 | ±.03 | 1.85 | ±.04 | .99 | ±.03 |......|...........|......|...........|
| 3/0 | 1.77 | ±.04 | 1.03 | ±.03 | 2.00 | ±.04 | 1.03 | ±.03 |......|...........|......|...........|
| 4/0 | 1.89 | ±.04 | 1.10 | ±.03 | 2.10 | ±.04 | 1.10 | ±.03 |......|...........|......|...........|
+-----------+------+-----------+------+-----------+------+-----------+------+-----------+------+-----------+------+-----------+
TABLE 6--NOMINAL DIAMETERS OF HEAVY JACKETED
CORDS WITH TOLERANCES IN INCHES--600 VOLTS
+-----------+----------------------+----------------------+----------------------+----------------------+----------------------+----------------------+
| | 2-conductor | 3-conducter | 4-conducter | 5-conducter | 6-conductor | 7-conductor |
| Conductor |-----------|------------|-----------|------------|-----------|------------|-----------|------------|-----------|------------|-----------|------------|
| size--AWG | Diameter | Tolerance | Diameter | Tolerance | Diameter | Tolerance | Diameter | Tolerance | Diameter | Tolerance | Diameter | Tolerance |
+-----------+----------+-----------+----------+-----------+----------+-----------+----------+-----------+----------+-----------+----------+-----------+
| 14........| 0.64 | ±0.02 | 0.67 | ±0.02 | 0.71 | ±0.02 | 0.78 | ±0.03 | 0.83 | ±0.03 | 0.89 | ±0.03 |
| 12........| .68 | ±.02 | .72 | ±.03 | .76 | ±.03 | .83 | ±.03 | .89 | ±.03 | .98 | ±.03 |
| 10........| .73 | ±.03 | .80 | ±.03 | .84 | ±.03 | .90 | ±.03 | 1.00 | ±.03 | 1.07 | ±.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 | Type SHD-GC | Type SHD-GC |
| | (nonshielded) 2,000 | (shielded overall) | (individually shielded | (individually shielded |
| Conductor size-- | volts | 2,000 volts | power conductors) | power conductors) |
| AWG or MCM |-----------|------------|-----------|------------| 2,001-3,000 volts | 3,001-5,000 volts |
| | | | | |------------|-------------|------------|-------------|
| | Diameter | Tolerance | Diameter | Tolerance | Diameter | Tolerance | Diameter | Tolerance |
+------------------+----------+-----------+----------+-----------+-----------+------------+-----------+------------+
| 6................| 1.25 | +0.10, | | | | | | |
| | | -0.06 | 1.39 | +0.11, | | | | |
| | | | | -0.07 | 1.62 | +0.13, | | |
| | | | | | | -0.08 | 1.78 | +0.14, |
| | | | | | | | | -0.09 |
| 4................| 1.40 | +.11,-.07 | 1.55 | +.12,-.08 | 1.77 | +.14,-.09 | 1.90 | +.15,-.10 |
| 3................| 1.48 | +.12,-.07 | 1.62 | +.13,-.08 | 1.84 | +.15,-.09 | 1.98 | +.16,-.10 |
| 2................| 1.55 | +.12,-.08 | 1.71 | +.14,-.09 | 1.92 | +.15,-.10 | 2.09 | +.17,-.11 |
| 1................| 1.74 | +.14,-.09 | 1.89 | +.15,-.09 | 2.04 | +.16,-.10 | 2.18 | +.17,-.11 |
| 1/0..............| 1.84 | +.15,-.09 | 2.02 | +.16,-.10 | 2.18 | +.17,-.11 | 2.34 | +.19,-.12 |
| 2/0..............| 1.99 | +.16,-.10 | 2.16 | +.17,-.11 | 2.29 | +.18,-.12 | 2.46 | +.20,-.12 |
| 3/0..............| 2.12 | +.17,-.11 | 2.30 | +.18,-.11 | 2.45 | +.20,-.12 | 2.62 | +.21,-.13 |
| 4/0..............| 2.30 | +.18,-.12 | 2.48 | +.20,-.12 | 2.62 | +.21,-.13 | 2.76 | +.22,-.14 |
| 250..............| 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 | Maximum allowable |
| Conductor size-- | Ohms/ | allowable | circuit breaker |
| AWG or MCM | 1,000 ft. | fuse rating | instantaneous |
| | at 25° C. | (amperes) | setting (amperes)1 |
+------------------+-----------+-------------+--------------------+
| 14...............| 2.62 | 20 | 50 |
| 12...............| 1.65 | 30 | 75 |
| 10...............| 1.04 | 40 | 150 |
| 8................| .654 | 80 | 200 |
| 6................| .410 | 100 | 300 |
| 4................| .259 | 200 | 500 |
| 3................| .205 | 250 | 600 |
| 2................| .162 | 300 | 800 |
| 1................| .129 | 375 | 1,000 |
| 1/0..............| .102 | 500 | 1,250 |
| 2/0..............| .081 |.............| 1,500 |
| 3/0..............| .064 |.............| 2,000 |
| 4/0..............| .051 |.............| 2,500 |
| 250..............| .043 |.............| 2,500 |
| 300..............| .036 |.............| 2,500 |
| 350..............| .031 |.............| 2,500 |
| 400..............| .027 |.............| 2,500 |
| 450..............| .024 |.............| 2,500 |
| 500..............| .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 FEET1
+------------------+---------------+------------------+---------------+
| | | Normal ampacity | Resistance at |
| | Max. | at 60° C. copper | 60° C. copper |
| Conductor size-- | allowable | temperature (40° | temperature |
| AWG or MCM | length (feet) | C. ambient) | (ohms) |
+------------------+---------------+------------------+---------------+
| 6................| 550 | 50 | 0.512 |
| 4................| 600 | 70 | .353 |
| 3................| 650 | 80 | .302 |
| 2................| 700 | 95 | .258 |
| 1................| 750 | 110 | .220 |
| 1/0..............| 800 | 130 | .185 |
| 2/0..............| 850 | 150 | .157 |
| 3/0..............| 900 | 175 | .130 |
| 4/0..............| 1,000 | 200 | .116 |
| 250..............| 1,000 | 220 | .098 |
| 300..............| 1,000 | 240 | .082 |
| 350..............| 1,000 | 260 | .070 |
| 400..............| 1,000 | 280 | .061 |
| 450..............| 1,000 | 300 | .054 |
| 500..............| 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.
[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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