Original Version

Rule 49.1-A

49.1-A.    Poles, Tower and Other Structures

Wood poles shall be of sound timber, free from defects which would materially reduce their strength or durability and they shall have sufficient strength to withstand, with safety factors not less than those specified in Rule 44, the maximum stresses to which they are subjected under the loading conditions specified in Rule 43.  The modulus of rupture used in calculation of safety factors shall be not greater than the value given in Rule 48.1.

Metallic, prestressed concrete and reinforced concrete poles, together with their foundations, shall be of such material and dimensions as to withstand, with safety factors not less than those specified in Rule 44, the maximum stresses to which they are subjected under the loading conditions specified in Rule 43.  The fiber stress values used in calculation of safety factors shall be as specified in Rule 48.2, 48.3 and 48.6.

Certain poles subject to special stresses due to angles in the line, dead –ending of conductors or other attachments, which stresses must be included in computing the loading and safety factor.  Poles subject to these special stresses sometimes require the use of guy attachment shall be considered merely as a strut, the guy taking all lateral stresses.  In such cases the pole strength requirement shall apply at the point of guy attachment rather than at the ground line.

Strikeout and Underline Version

Rule 49.1

49.1-A.    Poles, Tower and Other Structures

Wood poles shall be of sound timber, free from defects which would materially reduce their strength or durability and they shall have sufficient strength to withstand, with safety factors not less than those specified in Rule 44, the maximum stresses to which they are subjected under the loading conditions specified in Rule 43.  The modulus of rupture used in calculation of safety factors shall be not not be greater than the value given in Rule 48.1.

Metallic, pre-stressed concrete and reinforced concrete poles, together with their foundations, shall be of such material and dimensions as to withstand, with safety factors not less than those specified in Rule 44, the maximum stresses to which they are subjected under the loading conditions specified in Rule 43.  The fiber stress values used in calculation of safety factors shall be as specified in Rule 48.2, 48.3 and 48.6.

Materials, other than wood used for poles, towers and structures, to ether with their foundations shall be of such strength as to withstand, with safety factors not less than those specified in Rule 44, the maximum stresses to which they are subjected under the loading specified in Rule 43.

Certain poles subject to special stresses due to angles in the line, dead –ending of conductors or other attachments, which stresses must be included in computing the loading and safety factor.  Poles subject to these special stresses sometimes require the use of guy attachment shall be considered merely as a strut, the guy taking all lateral stresses.  In such cases the pole strength requirement shall apply at the point of guy attachment rather than at the ground line.

Final Version

Rule 49.1-A

49.1-A.    Poles, Tower and Other Structures

Wood poles shall be of sound timber, free from defects which would materially reduce their strength or durability and they shall have sufficient strength to withstand, with safety factors not less than those specified in Rule 44, the maximum stresses to which they are subjected under the loading conditions specified in Rule 43.  The modulus of rupture used in calculation of safety factors shall not be greater than the value given in Rule 48.1,

Materials, other than wood used for poles, towers and structures, to ether with their foundations shall be of such strength as to withstand, with safety factors not less than those specified in Rule 44, the maximum stresses to which they are subjected under the loading specified in Rule 43.

Certain poles subject to special stresses due to angles in the line, dead –ending of conductors or other attachments, which stresses must be included in computing the loading and safety factor.  Poles subject to these special stresses sometimes require the use of guy attachment shall be considered merely as a strut, the guy taking all lateral stresses.  In such cases the pole strength requirement shall apply at the point of guy attachment rather than at the ground line.