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 MIL-HDBK-419A
Table 1-2
Minimum Requirements for Roof and Down Conductors on
Structures Not Greater than 75 Feet (23 Meters) in Height (1-3)
Type of Conductor
Material
Aluminum
Copper
Cable
Strand Size
14 AWG
12 AWG
95 pounds
Weight per 1000 feet*
187-1/2 pounds
Area*
59,500 Cir mils
98,500 Cir mils
0.176 ohms/1000 ft
DC Resistance
0.176 ohms/1000 ft
Solid Strip
Thickness
14 AWG
12 AWG
Width
1 inch* *
1 inch**
DC Resistance
0.176 ohms/1000 ft
0.176 ohms/1000 ft
Weight Per 1000 feet
95 pounds
Solid Rod
186-1/2 pounds
DC Resistance
0.176 ohms/1000 ft
0.176 ohms/1000 ft
95 pounds
Tubular Rod
Weight per 1000 feet
187-1/2 pounds
0.064 inch
Wall Thickness
0.032 inch
DC Resistance
0.176 ohms/1000 ft
0.176 ohms/1000 ft
*Acceptable substitutes are No. 2 AWG copper cables and 1/0 AWG aluminum cables.
**This is the minimum width for a strip void of perforations. If perforated, the width shall be increased
equal to the diameter of the perforations.
Table 1-3
Minimum Requirements for Roof and Down Conductors on
Structures Greater than 75 Feet (23 Meters) in Height (1-3)
Minimum
Weight
Weight Per
DC Resistance
Material
Wire Strand Size*
Per Foot
1000 Feet
Per 1000 Feet
AWG
Ounces
Pounds
Ohms
14
Copper
6
375
0.088
Aluminum
12
3
190
0.088
*Equivalent standard AWG cable: Copper - 2/0, Aluminum - 4/0
1-34
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