Abstract :
The specifications are intended to apply in general to joints on cables operating at voltages above 10,000, and in particular to joints operating above 20,000 volts. The specifications include the following points: 1. The cable sheath should be cut back from the ends of the conductor a sufficient distance to allow the application of the insulation to the joint without injuring the insulation around the conductors. 2. The copper splicing sleeves should have a carrying capacity at least equal to that of the conductors. 3. The ends of the copper splicing sleeve should be carefully tapered, rounded and finished so as to eliminate all sharp points or edges. 4. The conductors should be separated from each other and from the enclosing lead sleeve by some form of solid insulation that will hold them in a fixed position relative to each other and to the enclosing lead sleeve. 5. The filling compound should have sufficient dielectric strength, which should not be materially reduced at the maximum operating temperature of the cable. a. It should be non-hygroscopic. b. It should not form cracks in cooling nor during cold weather. c. It should be sufficiently fluid when poured that it will flow into all air spaces before becoming chilled: e. It should be capable of being readily removed when necessary without injury to the insulation around the conductors. f. It should not have an excessive coefficient of expansion. 6. The insulation should be applied and the compound poured in such a manner that the joint will be without air pockets or voids. 7. All moisture should be carefully excluded from the joint. 8. If filling compounds with low melting point are used precaution should be taken to prevent the compound from running back into the cable at the maximum operating temperature. 9. The initials, or some other symbol, should be stamped on the joint to indicate the name of the Splicer. 10. The joint should be so located, supported and protected that it cannot be readily injured by- men working in the manhole.
