Original Version
Rule 49.2-B
49.2-B. Minimum Size
(1) Wood: Crossarms used to support or guard supply conductors shall have cross-sectional dimensions not less than the following:
One piece (homogeneous): 3 ¼ x 4 ¼ inches,
Fabricated: any single member. 1 ¾ x 4 ¼ inches, or
Laminated: 3 x 4 inches.
Crossarms supporting or guarding communication conductors shall provide the strength of Douglas fir having a cross section not less than 3 by 4 ¼ inches except that crossarms six and one-half feet or less in length which support sixteen wires or less shall provide the strength of Douglas fir having a cross section not less than 2 ¾ by 3 ¾ inches.
(2) Metal: The physical properties as a result of dimensions, shape and cross-sectional area of metal crossarms shall be such as to result in sufficient strength to meet the requirements of Rules 46, 47 and 48.2, provided the thickness of any element shall be not less than 3/32 inch.
(3) Pre-stressed Concrete: The minimum dimension of any pre-stressed concrete member shall be 3 inches.
Strikeout and Underline Version
Rule 49.2-B
49.2-B. Minimum Size
The physical properties as a result of dimensions, shape and cross-sectional area crossarms shall be such as to result in sufficient strength to meet the requirements of these Rules.
(1) Wood: Crossarms used to support or
guard supply conductors shall have cross-sectional dimensions not less than the
following:
One piece (homogeneous): 3 ¼ x 4 ¼ inches,
Fabricated:
any single member. 1 ¾ x 4 ¼ inches, or
Laminated:
3 x 4 inches.
Crossarms supporting or guarding
communication conductors shall provide the strength of Douglas fir having a
cross section not less than 3 by 4 ¼ inches except that crossarms six and
one-half feet or less in length which support sixteen wires or less shall
provide the strength of Douglas fir having a cross section not less than 2 ¾ by
3 ¾ inches.
(2)
Metal: The physical properties as a result
of dimensions, shape and cross-sectional area of metal crossarms shall be such
as to result in sufficient strength to meet the requirements of Rules 46, 47
and 48.2, provided the thickness of any element shall be not less than 3/32
inch.
(3) Pre-stressed
Concrete: The minimum dimension of
any pre-stressed concrete member shall be 3 inches.
Final Version
Rule 49.2-B
49.2-B. Minimum Size
The physical properties as a result of dimensions, shape and cross-sectional area crossarms shall be such as to result in sufficient strength to meet the requirements of these Rules.