Electricity Supply.
be had to the normal use by the occupier of any premises or land and where necessary (a) the height of the line conductors shall be increased to provide sufficient clearance for safety in accordance with such use, and (b) provision as hereinafter prescribed in paragraph (14) or (17) shall be made to prevent danger.
[CAP. 103
Line conductors
lines.
(5) Where a line conductor crosses over or under or is in proximity to any other overhead wire, precautions crossing other shall be taken by the company to prevent contact, due to breakage or otherwise, between the line conductor and the other overhead wire, or between the other wire and the line conductor: Provided that this paragraph shall not be deemed to require the company to take precautions against contact between a broken line conductor and other auxiliary conductors and earth wires carried on the same support and forming part of the same overhead line.
(6) Line conductors shall be attached to suitable insulators carried on supports of iron, steel or reinforced concrete. Special precautions shall be taken to prevent the corrosion of all metal work at or below the surface of the ground.
safety of
(7) The supports, in conjunction with stays or struts if provided, shall withstand the longitudinal, transverse and vertical loads due to the wind pressure hereinafter specified without damage and without movement in the ground. In no case shall the strength of a support in the direction of the overhead line be less than one-quarter the required strength in a direction transverse to the line.
The following factors of safety shall apply to each support-
Material.
Iron or steel
Reinforced concrete
Factor of safety.
3
4
These factors of safety shall be calculated on the assumption that all line conductors, cables and wires carried by the supports are at a temperature of 70° F., and that together with the supports they are subjected to a wind pressure of 40 lb. per square foot.
183
Electricity Supply.
be had to the normal use by the occupier of any premises or land and where necessary (a) the height of the line con- ductors shall be increased to provide sufficient clearance for safety in accordance with such use, and (b) provision as hereinafter prescribed in paragraph (14) or (17) shall be made to prevent danger.
[CAP. 103
Line conductors
lines.
(5) Where a line conductor crosses over or under or is in proximity to any other overhead wire,. precautions crossing other shall be taken by the company to prevent contact, due to breakage or otherwise, between the line conductor and the other overhead wire, or between the other wire and the line conductor: Provided that this paragraph shall not be deemed to require the company to take precautions against contact between a broken line conductor and other auxiliary conductors and earth wires carried on the same support and forming part of the same overhead line.
(6) Line conductors shall be attached to suitable Supports. insulators carried on. supports of iron, steel or reinforced concrete. Special precautions shall be taken to prevent the corrosion of all metal work at or below the surface of the ground.
safety of
(7) The supports, in conjunction with stays or struts Factor of if provided, shall withstand the longitudinal, transverse and supports. vertical loads due to the wind pressure hereinafter specified without damage and without movement in the ground. In no case shall the strength of a support in the direction of the overhead line be less than one-quarter the required strength in a direction transverse to the line.
The following factors of safety shall apply to each support-
Material.
Iron or steel
Reinforced concrete
Factor of safety.
3
4
These factors of safety shall be calculated on the assumption that all line conductors, cables and wires carried by the supports are at a temperature of 70° F., and that together with the supports they are subjected to a wind pressure of 40 lb. per square foot.
183
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