Patent ID: 7409816
Filing Date: 2008-08-12
Classification: H01B

Abstract:
1. A concentric stranded conductor having a concentric strand comprising a plurality of strands twisted together, in which each of the strands comprises a plurality of single wires twisted together; wherein the concentric stranded conductor has a central core strand and a first concentric strand layer which comprises a plurality of first-layer strands twisted together around the central core strand; wherein a twist pitch of the central core strand is from 8 to 70 times of a distance between diametrically opposed outer wires of the central core strand, a twist pitch of the first-layer concentric strand is from 8 to 30 times of a distance between diametrically opposed strands of the first-layer concentric strand, |α−(β+γ)| is 15 degrees or less, where α is a twist angle of the central core strand, β is a twist angle of the first-layer strands and γ is a twist angle of the first concentric strand layer, and each of the single wires is made of aluminum or an aluminum alloy, each having elongation of 2% or more.