Journal of electricity, power, and gas . for copper60,000 lb. the relation of the two conductors becomes X 24,000 375601 X 60,000 60000 .62, an aluminum con- ductor has only 62 per cent of the strength of a cop-per conductor of the same carrying capacity. Fortun-ately the load which the conductors on this line have,to carry can be carried safely by the aluminum andadvantage can therefore be taken of a lighter con-ductor. Since this line was constructed, steel coredaluminum cables have been put on the market andhave been used with great satisfaction by severalpower companies. The ste
Journal of electricity, power, and gas . for copper60,000 lb. the relation of the two conductors becomes X 24,000 375601 X 60,000 60000 .62, an aluminum con- ductor has only 62 per cent of the strength of a cop-per conductor of the same carrying capacity. Fortun-ately the load which the conductors on this line have,to carry can be carried safely by the aluminum andadvantage can therefore be taken of a lighter con-ductor. Since this line was constructed, steel coredaluminum cables have been put on the market andhave been used with great satisfaction by severalpower companies. The steel cored cable is muchheavier for the same conductivity but has a very muchhigher tensile strength than hard drawn copper. The conductors used have a cross sectional areaof 270,000 cm. consisting of 19 strands, an elasticlimit of 14,000 lb. per sq. in., an ultimate strength of24,000 lb. per sq. in. and weighs 1315 lb. per mile. The Towers. In a distribution line where the amount of powerto be transmitted is small and where owing to the. I if tfU-i t iilHiy ?.. Details of Towers. revenue being in proportion the cost must be keptdown in order that the line may earn a dividend, cedarpoles have to be used. Cedar poles however are veryinflammable and are easily set on fire. A spark from April 18, 1914.] JOURNAL OF ELECTRICITY, POWER AND GAS 331 a brush, timber or other kind of fire settling in aweather crack is liable in dry weather to start the polesmoldering and once started it will continue tosmolder or burst into flames and the result is a burntoff pole. A leaky insulator may start a fire in a poletop or the charging current due to the insulator actingas a condenser may do the same with the result thatwhen the pole top is burnt off the wire is allowedto fall and cross with other wires of the circuit. Theseare perhaps the principal reasons why the conductorsof Tie Lines such as the one we are consideringare usually supported on steel towers The generally accepted type of tower at
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