4.1.5.5 Assembly of strandsA 19-wire combination round-wire unilay stranded conductor shall be round and shall consist of a straightcentral wire, an inner layer of six wires of the same diameter as the central wire, and an outer layerconsisting of six wires with the same diameter as the central wire, alternated with six wires with a diameterof 0.732 times the diameter of the central wire. No particular assembly of the individual wires of any otherstranded conductor is required. However, simple bunching (untwisted strands) shall not be used. Thelength of lay of the strands in a bunch-stranded conductor twisted as a single bunch shall not be greaterthan indicated in Table 4. The direction of lay of the strands in a bunch-stranded conductor shall beleft-hand.4.1.5.6 Length and direction of layEvery stranded conductor other than a compact-stranded conductor, or a bunch-stranded conductortwisted as a single bunch, shall comply with the following: