4.1 Conductor 4.1.1 Hard-drawn aluminum wires The conductor shall be compacted stranded conductor of hard drawn aluminum wire in combination with aluminum-clad steel wire. The construction of the conductor shall be in accordance with Table 1 and 2. The interstices of the stranded conductor be sealed with a suitable material, as a rule, using swelling tapes as an impediment to longitudinal water penetration. 4.1.3 Aluminum-clad steel wire Aluminum-clad steel wire shall be close adhesion covering to aluminum. Characteristic should be the same as in Table 2 before stranded <Table 2.> Characteristic of Reference value Aluminum Tensile Elonga- Conduc- Twist Size Diameter strength tion tivity to Al Breaking Electric (Dia.) Tolerance Min. Min. Min. Break Al Approx. load Resistance (mm) (mm) Rolling Min. Nom. Weight (%) (%) (No.) Thick. (kg/km) Thick. kN (kgf) Test Ω/km (mm) (mm) 10.29 1,27 16 53 3.2 . ±0.06 1.5 . 20.3 0.15 0.22 . 10.6 (130) (1,050) Do 1,27 12.25 not 3.5 1.5 20.3 16 0.15 0.24 8.83 63.4 ±0.07 (130) (1,250) crack 1,23 15.39 4.0 ±0.08 1.5 20.3 16 0.20 0.27 6.76 82.8 (125) (1,570) 4.1.3 Lay The direction of lay of aluminum and steel wires shall be reversed in successive layers. The outermost layer of wires in all conductors shall be in left-hand direction of lay(s). A multiple of pitch is not more than the values in Table 3. External diameter is the values in Table 1, and cross-sectional area of aluminum is not less ±2% than 95% of Nominal-sectional area. <Table 3.> Number of wire Pitch of Aluminum Al St Outside of Inside of Layer 6 1 16 -
4.1 Conductor 4.1.1 Hard-drawn aluminum wires The conductor shall be compacted stranded conductor of hard drawn aluminum wire in combination with aluminum-clad steel wire. The construction of the conductor shall be in accordance with Table 1 and 2. The interstices of the stranded conductor be sealed with a suitable material, as a rule, using swelling tapes as an impediment to longitudinal water penetration. 4.1.3 Aluminum-clad steel wire Aluminum-clad steel wire shall be close adhesion covering to aluminum. Characteristic should be the same as in Table 2 before stranded <Table 2.> Size (Dia.) (mm) Diameter Tolerance (mm) Tensile strength Min. Elonga- tion Min. (%) Conduc- tivity Min. (%) Twist to Break (No.) Characteristic of Aluminum Reference value Al Min. Thick. (mm) Rolling Test Al Nom. Thick. (mm) Breaking load kN (kgf) Electric Resistance Ω/km Approx. Weight (kg/km) 3.2 . ±0.06 1,27 (130) 1.5 . 20.3 16 0.15 Do not crack 0.22 10.29 (1,050) . 10.6 53 3.5 ±0.07 1,27 (130) 1.5 20.3 16 0.15 0.24 12.25 (1,250) 8.83 63.4 4.0 ±0.08 1,23 (125) 1.5 20.3 16 0.20 0.27 15.39 (1,570) 6.76 82.8 4.1.3 Lay The direction of lay of aluminum and steel wires shall be reversed in successive layers. The outermost layer of wires in all conductors shall be in left-hand direction of lay(s). A multiple of pitch is not more than the values in Table 3. External diameter is ±2% the values in Table 1, and cross-sectional area of aluminum is not less than 95% of Nominal-sectional area. <Table 3.> Number of wire Pitch of Aluminum Al St Outside of Inside of Layer 6 1 16 -