General Order 95
Section IV
Strength Requirements for All Classes of Lines
47.5 End Supports in Grades “A” or “B” Construction
In Grades “A” or “B” construction the longitudinal load on each
end support of crossings, conflicts or joint use, where located in lines of
the same grade of construction, shall be taken as the unbalanced load equal
to the tension of one–third of the total number of conductors (not including
overhead ground wires), such one–third of the conductors being so selected
as to produce the maximum stress in the supports. If the application of the
above results in the fractional part of a conductor, the nearest whole number
of conductors shall be used. The construction of the supports (including poles,
structures, towers, crossarms, pins, insulators, conductor fastenings and
guys) shall be such as to withstand at all times the load specified with a
safety factor at least equal to unity. Excluded from the requirements of this
rule, where Grade “B” construction is required, are Class L lines crossing
minor railways and conductor fastenings of Class C circuits crossing major
railways.