Change List for this Rule


Original Version
Rule 49.1-A


49.1-A.    Strength

 

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.

Steel 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 and 48.3.

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.

Spliced or stub reinforced poles or pole top extensions, including the attachment (joint) of the different members involved, shall meet all of the vertical, transverse and longitudinal strength requirements of these rules as if a whole pole were used.  Spliced or stub reinforced poles or pole top extensions shall not be used where Grade A construction is required in supports of crossings or conflicts, or where Grade B construction is required for Class C lines crossing the main lines of major railways.

 
Strikeout and Underline Version
Rule 49.1-A


49.1-A.    Strength

 

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 Steel 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 and, 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.

Spliced or stub reinforced poles or pole top extensions, including the attachment (joint) of the different members involved, shall meet all of the vertical, transverse and longitudinal strength requirements of these rules as if a whole pole were used.  Spliced or stub reinforced poles or pole top extensions shall not be used where Grade A construction is required in supports of crossings or conflicts, or where Grade B construction is required for Class C lines crossing the main lines of major railways.

 

Final Version
Rule 49.1-A


49.1-A.    Strength

 

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 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.

Spliced or stub reinforced poles or pole top extensions, including the attachment (joint) of the different members involved, shall meet all of the vertical, transverse and longitudinal strength requirements of these rules as if a whole pole were used.  Spliced or stub reinforced poles or pole top extensions shall not be used where Grade A construction is required in supports of crossings or conflicts, or where Grade B construction is required for Class C lines crossing the main lines of major railways.