Power cable outer sheath type
1. cable sheath should meet the following requirements:
 
(1) AC system single core power cable, when the need to enhance the cable resist external forces, should be selected non magnetic metal armor layer, shall not be used without the non-magnetic effective treatment steel armour.
(2) in the wet, containing chemical corrosive environment or susceptible to water immersion of the cable, the metal layer, strengthening layer, the braid should be PE outer sheath, the cable in water, thick steel wire armoured should be extruded outer layer of protection.
(3) in crowded public facilities, and low toxic flame retardant fire resistance requirements of the place, does not contain halogen outer protective layer are selected as polyvinyl chloride or ethylene propylene rubber, and so on.
When the fire protection has low toxicity, it is not suitable to use PVC outer layer.
(4) except below -150C low-temperature environment or medicinal liquid chemical immersion place, and low toxic and non inflammable requirement of cable extrusion outer protective layer should use polyethylene outer and other can use PVC layer of protection.
(5) with has in water or liquid chemical immersion place of 6 - 35kV importance or above 35kV XLPE cable should be used in accordance with the requirements of the metal plastic composite water resisting layer and the metal sleeve radial waterproofer.
The middle and high voltage cross linked polyethylene cable laid under water should have the structure of longitudinal water resistance.
 
2. Self contained oil filled cable strengthen layer type, when the line is not set stopper joints to the highest and lowest point of elevation difference between the should be in accordance with the following requirements:
(1) only copper radial reinforcing layer, allowing height should be 40m; but for an important loop for 30m times.
(2) both radial and longitudinal strip strengthening layer, allowing high differential is 80m; but used for important loop is 60m.
 
3. The outer sheath of the buried cable selection, shall comply with the following provisions:
(1) under high pressure cable or mechanical injury risk, should strengthen layer or steel wire armored layer.
(2) in the quicksand, backfill with possible displacement of the soil, the cable should have steel wire armored.
(3) severe termite damage area extruded cables should be selected higher hardness of the outer protective layer, can also be the common external support layer extruded high hardness of the thin outer protective layer, the material can be made of nylon or special polyolefin copolymer, also can use a set of metal or steel tape armored.
(4) the high ground water level region, should use polyethylene outer layer.
 
4. the choice of cable sheath for installation in the air shall be in accordance with the following provisions:
(1) small cross-section extruded insulating cable laying directly on the arm bracket, should have a steel armor.
(2) in the safety of the underground passenger transportation, commercial facilities and other requirements of high places severe rodent, plastic insulated cable should be with metal or steel tape armoured belt.
(3) cable in high drop, stress condition and multi core cable should be with steel wire armored and AC single core cables shall conform to the provisions specification.
(4) laid in the bridge and other supporting intensive cable without armor.
(5) the need to clear the need to coordinate with the environmental protection, not the use of PVC outer layer.
(6) in addition to the above requirements, as well as more than 60℃ temperature places should choose the outer layer of polyethylene and other heat resistant cable, other appropriate use of PVC outer sheath.
 
5. mobile electrical equipment, such as the need to frequently bend or have a high flexibility requirements of the loop cable, should use the rubber outer layer.
 
6. Put ray place of cable, is suitable for the radiation tolerance of the radiation intensity of polyvinyl chloride, chlorine butyl rubber, chlorine sulfonated polyethylene endures protective layer.
 
7. cable protection tube laying, with extruded outer sheath.
 
8. the selection of the cable protection layer for underwater laying shall be in accordance with the following provisions:
(1) in the non navigable river such as ditches, cable without armor layer under tension, can choose the steel armor.
(2) River, lake and sea cable, selection of steel wire armored type should meet the stress condition. When the laying condition has mechanical damage and other prevention requirements, can choose to meet the requirements of the protection, corrosion resistance of the outer protection layer.
 
9. the choice of cable sheath in different laying conditions shall be in accordance with the following provisions:
(1) the length of the line is not more than the length of the cable manufacturing, it is appropriate to choose to meet the full line of the same or different types of conditions as far as possible.
(2) when the length of the line is more than the manufactured length of the cable, according to the corresponding section select suitable different types.

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