it must carry and on the allowable
Keep in mind that the
Although a generator is balanced, an
larger the wire size, the greater its
inspection of the phases at any point
in the distribution system may reveal
will have, hence, less voltage drop.
that the phases are out of balance.
Economy, however, should be considered
in size determination.
Table 1 shows
In a 3 4W system, three hot wires and
capacities for wires ranging from a
three hot wires carrying the same
No. 8 to a 4/0.
At one pole, power may be
delivered to one of the 1 2W loads in
a. Types of conductors. Conductors
used in overhead distribution systems
facility with a branch consisting of
at Army posts are usually copper,
one phase and the neutral. Therefore,
although they may be steel, aluminum,
between this pole and the next, the
three phases will not be balanced.
Copper has high
Such phase or pole to pole
unbalances are not uncommon due to the
Hard-drawn or medium-hard-drawn copper
various loads applied to the system.
conductors because of its strength.
this situation may be allowed to exist
without any harmful effects to the
tensile strength from 50,000 pounds
per square inch to 35,000 pounds,
soldered splices should not be used on
hard-drawn copper wire because the hot
sleeves are normally used when making
The size of wire for a given section
of a system is selected on the basis
of the amount of electrical load that