Electrical cable armor

The IEEE definition makes an important distinction between ground and earth. Earth refers to mother earth, and ground refers to the equipment grounding system, which includes equipment grounding conductors, metaUic raceways, cable armor, enclosures, cabinets, frames, building steel, and all other non-current-carrying metal parts of the electrical distribution system. 

For offshore locations where ignitible gas-air concentrations are neither continuously present nor present for long periods, API RP 14F also allows type MC cable with a continuous aluminum sheath and an outer impervious jacket (such as PVC) and armored cables satisfying ANSI/ Institute of Electrical and Electronic Engineers (IEEE) Standard No. 45. API RP 14F does not recommend IMC for offshore installations and cautions users that installations of MI cable require special precautions. The insulation of MI cable is hygroscopic (able to absorb moisture from the atmosphere). 

Since important properties of the poly(p-aramide)s are quite different from those of Nomex , most apphcations are also different. Characteristic are applications as bullet-proof body armor, cut-fast gloves, substitute of asbestos, and as reinforcing component in concrete. They are also used as fibers in high performance tires for airplanes and racing cars, or as laminates for the constmction of boat hulls. Furthermore, poly(p-aramide)s are used for the production of sports articles, drum heads, brake pads, turbo hoses, optical fiber cables, or electrical-mechanical cables. Their fabrics serve as hot air filters and in combination with Nomex for the production of protective clothing and helmets. The total production of polyaramides amounts in 2008 to 60,000 tons. 

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