Unshielded service wire for buried installation

An unshielded service wire which is suitable for use in a buried environment, said service wire comprising:

• a core which has a longitudinal axis and which comprises
• at least one pair of insulated metallic conductors which are twisted together and which extend longitudinally;
• a longitudinally extending waterblocking member which is associated individually with said at least one pair of longitudinally extending metallic conductors;
• and
• a longitudinally extending waterblocking member disposed adjacent to said at least one pair of longitudinally extending insulated metallic conductors;
• a jacket which is made of a plastic material and which has an oval-shaped cross section transverse to said longitudinal axis of said core with the oval-shaped cross section having a major axis and a minor axis which is normal to the major axis;
• said plastic material of said jacket engaging each waterblocking member and portions of said insulated metallic conductors;
• and
• two longitudinally extending strength members embedded substantially in said jacket with each strength member being disposed adjacent to an intersection of said major axis and an outer periphery of said jacket cross section.