2 Answers

Insulation: The early rubber insulation has been replaced by thermoplastic insulation with excellent aging properties, thermal characteristics, and dielectric strength.

Wraps: Cotton braiding has been replaced with impregnated paper material that has good dielectric qualities and is moisture-resistant.

Anti-short bushings: Fibrous material used in early bushings has been replaced by thermoplastics that allow easy sliding and eliminate ripping, tearing, and deterioration.

Bonding wire: Easily breakable, flat bonding wire has been eliminated and replaced with a bonding wire that is in constant contact with the armor throughout the cable length.

Galvanizing: The early practice of galvanizing the sheet steel first, then cutting it into strips, left the cut edges unprotected and allowed them to rust. This technique has been di-opped in favor of galvanizing the steel after cutting, providing superior corrosion resistance.

Cutting techniques: A handheld roto-cutter (Seatek Co. Inc. pioneered the first commercially successful BX armor cable cutter in 1973. This patented tool is known as the Roto-Split) is now available to use in lieu of hacksaws, pliers, etc., for fast, automatically controlled cuts that significantly reduce the possibility of conductor damage.

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