**General Order 64-A**

**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 stress on the end supports of crossings, conflicts or joint
use, where located in lines of the same grade of construction, shall be taken
as the unbalanced tension equal to the stress 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 fractional part of a conductor, the nearest whole number shall
be used. The construction of the
supports (including poles, structures, towers, crossarms, pins, insulators and
conductor fastenings) shall be such as to withstand at all times the stress
specified with a safety factor at least equal to unity. Excluded from this rule are crossings,
conflicts, or joint use construction involving Class L circuits, street
railways and conductor fastenings of Class C circuits, where Grade “B”
construction is involved.