MIL-HDBK-1004/2A
Table 4
Conductor Sizes for Overhead Lines
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CONDUCTOR
SIZE
TYPE
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Not larger than
Not smaller than
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4/0 AWG (107 mm2)
8 AWG (8.37 mm2)
Copper
336.4 kcm (170 mm2)
6 AWG (13.3mm2)
Aluminum
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2.2.3.4 Special Primary Line. In special instances, use of other conductors
may be appropriate for primary conductors. Insulated conductor, copper or
aluminum, preassembled nonmetallic sheathed or metallic sheathed, messenger-
supported aerial cable is used where necessary to avoid exposure to open wire
hazards; for example, high reliability service in heavy storm areas. Compound
conductor materials such as copper-clad steel, aluminum-clad steel, galvanized
steel, or bronze are used to provide high strength or corrosion resistance.
2.2.3.5 Utilization Lines. For secondary or service drop cable, use
insulated multiplex type, either copper or aluminum.
2.2.3.6 Dissimilar Conductor Connections. Install appropriate connectors
that are specifically designed for such use where necessary to connect
aluminum conductors to copper conductors, in accordance with the instructions
of the manufacturer. Contact with dissimilar conductor materials shall be
minimized.
2.2.4
Insulators. To support bare or weatherproof conductors, select from
the following types of insulator, as appropriate to the installation:
a)
suspension type, single or multiple;
b)
spool type;
c)
line-post type;
d)
strain type; and
e)
pin type.
2.2.4.1 Insulator Combinations. Various types of insulators may be
combined; for example, strain type for anchor poles or dead ends with either
pin or line post for line insulation. Line-post types are considered to be
both less expensive and superior to pin types.
2.2.4.2 Dimensions and Loads. For dimension of insulators and permissible
loads, refer to the ANSI C29 standards as follows:
a) C29.1, Test Methods for Electrical Power Insulators;
b) C29.2, Insulators, Wet-Process Porcelain and Toughened Glass,
Suspension Type;
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