Non-circular electrical cable having a reduced pulling force

An extruder head for extruding an exterior sheath of a non-round electrical cable, the extruder head comprising:

• a non-circular guide channel extending through the extruder head to guide one or more conductors along a conductor path through the extruder head between a first end and a downstream second end of the extruder head;
• a first extrusion channel defining a first circular exit located between the first end and the downstream second end of the conductor path, wherein the first extrusion channel is configured for extrusion of a first sheath material into a circular first extrusion having a uniform thickness surrounding the conductor path;
• a second extrusion channel defining a second circular exit, wherein the second extrusion channel is configured for extrusion of a second sheath material onto an exterior surface of the circular first extrusion to form a two-layer circular extrusion having a uniform thickness around the conductor path;
• and
• one or more vacuum channels located upstream of the first circular exit along the conductor path, wherein the one or more vacuum channels are configured to apply a negative pressure to an interior surface of the circular first extrusion of the two-layer circular extrusion to pull the two-layer circular extrusion into a two-layer non-circular sheath having a non-circular cross sectional shape around the one or more conductors at a location downstream of the second circular exit.