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|Thickenss||+ Not Limited |
on the length of any section
on the overall length of pole
+ 40 mm
+ 25 mm
For bulk supplies
For any single pole
the finished pole shall not be out of straightness by more 1/1600 of its length.
Based on the assumption that steel weights 7.85g.cm3 *Before making a selection of pole it is necessary to assume a suitable factor of safety has to be applied on the breaking load or the crippling load of the pole as the case may be depending on the relevant electricity rules to obtain the working load.
Value of working load of the poles with a factor of safety of 2 on crippling load and a factor 2.5 on braking load are both give in tables 1 & 2 in Indian standard book. The use will have to calculate the working load if different actors of safety other then tone stated above are applied.
Length the tolerance of the length of section shall be follow : On the length of section = 40mm. On the overall length + 10 mm.
The mean weight for bulk supplied shall no be then 5% below the calculated value the weight of any single pole shall not fall below the calculated weight more than 7.5%
Permissible TOLERANCE ON THE TUBE THICKNESS 10%