Nested insulating tube assembly for a coil lead

An insulating tube assembly for insulating an electrical conductor of a motor or a generator, comprising:

• a first insulating tube that includes a spirally wound insulating material, wherein the spirally wound insulating material is bound together to form a first self-supporting tube that independently retains its tubular shape after binding, and wherein the first insulating tube has a first diameter;
• a second insulating tube that includes said or another spirally wound insulating material, wherein said or another spirally wound insulating material is bound together to form a second self-supporting tube that independently retains its tubular shape after binding, and wherein the second insulating tube has a second diameter that is smaller than the first diameter;
• and
• a third insulating tube that includes said or another spirally wound insulating material, wherein said or another spirally wound insulating material is bound together to form a third self-supporting tube that independently retains its tubular shape after binding, and wherein the third insulating tube has a third diameter that is smaller than the second diameter,
• wherein the second diameter is sized such that the second insulating tube is capable of coaxially nesting within the first insulating tube such that a first interstice is formed between the first and second insulating tubes, and
• wherein the third diameter is sized such that the third insulating tube is capable of coaxially nesting within the second insulating tube such that a second interstice is formed between the second and third insulating tubes, and
• further wherein each of the first, second, and third insulating tubes is self-supporting so as to independently retain its respective tubular shape prior to being coaxially nested with any other of the first, second, and third insulating tubes.