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MULTIPLYING FACTORS FOR CONVERTING D.C.
RESISTANCE TO 60 CYCLE A.C. RESISTANCE
Size |
Multiplying Factor | |||
For Nonmetallic Sheathed Cables in Air or Nonmetallic Conduit |
For Metallic Sheathed Cables or all Cables in Metallic Raceways |
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Copper |
Aluminum |
Copper |
Aluminum |
|
Up to 3 AWG |
1. |
1. 1. 1. |
1. 1.01 1.01 |
1. 1.00 1.00 |
0 |
1.001 1.001 1.002 1.004 |
1.000 1.001 1.001 1.002 |
1.02 1.03 1.04 1.05 |
1.00 1.00 1.01 1.01 |
| 250000 CM 300000 CM 350000 CM 400000 CM |
1.005 |
1.002 1.003 1.004 1.005 |
1.06 1.07 1.08 1.10 |
1.02 1.02 1.03 1.04 |
| 500000 CM 600000 CM 700000 CM 750000 CM |
1.018 1.025 1.034 1.039 |
1.007 1.010 1.013 1.015 |
1.13 1.16 1.19 1.21 |
1.06 1.08 1.11 1.12 |
| 800000 CM 1000000 CM 1250000 CM 1500000 CM |
1.044 1.067 1.102 1.142 |
1.017 1.026 1.040 1.058 |
1.22 1.30 1.41 1.53 |
1.14 1.19 1.27 1.36 |
| 1750000 CM 2000000 CM |
1.185 1.233 |
1.079 1.100 |
1.67 1.82 |
1.46 1.56 |
The resistance values given are applicable only to direct current. When conductors larger than 4/0 are used with alternating current, the above multiplying factors must be used.