**AWG (American Wire Gauge)** - Standard system primarily used in the United states for specifying the size of a solid or stranded conductor.

**Bunch Stranding** - Stranded conductor composed of any number of wires of the same diameter that are twisted together without regard to the geometric

pattern of the individual strands. Common bunch configurations have 10, 16, 26, 41, 65, and 105 strands.

**Circular Mil (CMIL)** – Measurement for a solid round conductor area in CMILS, which is calculated by squaring the diameter in mils.

**Conductivity **– The measure of a materials ability to conduct an electric current between two points. Conductivity is the reciprocal of resistivity and typically

expressed as % IACS.

**Conventional Concentric Stranding** - Stranded conductor composed of a central wire that is surrounded by one or more layers of helically laid wires that

reverse the direction of lay and increase the lay length for each successive layer.

**IACS** – International Annealed Copper Standard, which is 1/58 Ohm-mm2/m at 20°C for 100% conductivity.

**Lay Direction** - The lateral direction in which the strands will run over the top as they recede from the observer looking along the axis of the conductor.

Typically specified as left or right hand lay with left being the most common direction.

**Lay Length **- Distance measurement of axial length of one turn of helix, which is usually expressed in inches and a function of the number of twist per foot.

**Resistivity** – The electrical resistance of a body for a volume (unit length and cross-sectional area, or unit length and weight). Resistivity is a material

property that is independent of the conductor size.

**Rope Stranding** - Composed of members that are concentric or bunch stranded. Stranding is specified by giving the number of members, the number

of strands within the member, and strand size (ex. 19x7/27). Typically specified for 8 AWG and larger conductors.

**Temperature Coefficient of Resistance** – Factor that represents the change in resistance per degree of temperature change and typically expressed as

factor per °C. Refer to ASTM B193 for correction formula and coefficients of various conductor materials.

**Unidirectional Concentric Stranding** - Stranded conductor composed of a central wire that is surrounded by one or more layers of helically laid wires that

have the same direction of lay and an increasing length of lay for each successive layer.

**Unilay Stranding** - Stranded conductor composed of a central wire that is surrounded by one or more layers of helically laid wires that have the same

direction of lay and the same lay length each successive layer.