APPENDIX E STANDARD SPECIFICATIONS 213 



The insulated' conductor shall 'be sufficiently flexible to stand being twistel three 

 times about itself, left for at least sixteen hours, and untwisted without the dielec- 

 tric showing any signs of rupture. 



Electrical Requirements. The insulation test shall be made on the outside dis- 

 tributing conductor whilst in water, the conductor having been previously submerged 

 in water for at least twelve hours prior ,to the test. All conductors, No. 16 B & S. 

 gauge and over, shall show an insulation resistance of not less than 500 megohms 

 per mile; and conductors under No. 16 B. & S. gauge shall have an insulation 

 resistance of not less than 250 megohms per mile. The temperature at which test 

 is to be made shall not be less than 60F. nor more than 70F. 



The test for insulation resistance shall be made with an electro-motive force of 

 not more than 550 volts, the insulation resistance to be figured from the deflection 

 obtained with the negative pole of the source of potential connection to the conductor 

 and after an electrification of one minute. If unequal deflections are obtained with 

 the positive and negative poles connected to the wire, the insulation shall be considered 

 defective. 



Mechanical Requirements. These include breaking weight, elongation, and braid- 

 ing. 



The breaking weight for No. 14 B. & S. gauge wire shall not be less than one 

 hundred and ninety (190) pounds; for No. 16 B. & S. gauge wire, not less than one 

 hundred and twenty-five (125) pounds; and for No. 19 B. & S. gauge wire not less than 

 seventy (70) pounds. 



The elongation in two feet 'shall not be less than 1 per cent for No. 14, No. 16, 

 and No. 19 B. & S. gauge wires. 



As to braiding, each insulated conductor shall be covered w r ith a close, smooth 

 braid, which shall be thoroughly impregnated with a permanent weather-proof com- 

 pound. The impregnated braid shall then be uniformly covered with a continuous 

 layer of the compound which shall adhere firmly to the braid. 



The compound shall not act injuriously on the dielectric or the braid, and shall 

 not melt when subjected to a temperature of 125 F., nor crack at a temperature of 

 30 F., and shall be insoluble in water. 



Packing for Shipment. The finished conductor shall be delivered in coils of one 

 continuous piece, the eye of the coil to be about nine inches. Both ends of the coil shall 

 be accessible. 



Each coil shall be securely bound with strong tape or twine in at least four 

 separate places, and shall then be wrapped with burlap or strong paper to prevent 

 mechanical injury during transportation. 



Each coil shall have its gauge and length plainly marked on two strong tags, one 

 tag to be attached to the coil and the other to the outside of the wrapping. 



6 Specifications for Glass Insulators 



The material desired under these specifications consists of glass insulators of 

 the style and dimensions hereinafter described. 



General 'The specifications and drawings are intended to include all instruc- 

 tions necessary to guide the manufacturer in his work. They are intended to co- 

 operate with and supplement each other so that any details indicated in one and not 

 in the other shall be executed as if indicated in both. 



Workmanship. All workmanship shall be of the best commercial grade. 

 'Material. The insulators shall be made of transparent colourless or green glass. 

 Dimensions. The insulators shall be of the style and dimensions shown in the 

 drawing attached hereto and: made part of these specifications. 



