Change List for this Rule

 

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 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.

 

 

Strikeout and Underline Version

Rule 49.1-A

 49.1-A    Strength

 

(1)    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 and shall meet the following:

 

a)    temperature and loading factors as specified in Rule 43.

 

b)    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. and the modulus of rupture used in calculation of safety factors shall be not greater than the value given in per Rule 48.1.

 

(2)    Non-wood materials, other than wood used for poles, towers and structures, together with including their foundations, shall meet the following:

 

a)    temperature and loading factors as specified in Rule 43.

 

b)    shall be of such strength as to withstand, with safety factors not less than those specified in Rule 44, and the structural values used in calculation of safety factors per Rules 48.2, 48.3 and 48.6. the maximum stresses to which they are subjected under the loading conditions specified in Rule 43.

 

(3)    In cases where lateral stresses on a pole or structure require the use of a guy(s), the pole or structure below the point of the guy attachment shall be considered merely a strut, the guy(s) 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. Certain poles are subject to special stresses due to angles in the line, deadending 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 guys, in which case the pole below the point 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.

 

(4)    Crossing spans - for crossing spans, Sspliced 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

 

(1)    Wood poles shall be of sound timber,and shall meet the following:

 

a)    Temperature and loading factors as specified in Rule 43.

 

b)    Safety factors not less than those specified inRule 44,. and the modulus of rupture used in calculation of safety factors per Rule 48.1.

 

(2)    Non-wood poles, towers and structures, including their foundations, shall meet the following:

 

a)    Temperature and loading factors as specified in Rule 43.

 

b)    Safety factors not less than those specified in Rule 44, and the structural values used in calculation of safety factors per Rules 48.2, 48.3 and 48.6.

 

(3)    In cases where lateral stresses on a pole or structure require the use of a guy(s), the pole or structure below the point of the guy attachment shall be considered merely a strut, the guy(s) 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.

 

(4)    Crossing spans - for crossing spans, 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.