Low-voltage armored cable VV22 power cable Uses: Polyethylene insulated PVC sheathed copper core power cable, laying in the room, tunnels and pipes, armored cable mechanical protective layer can be added to any structure of the cable to increase the cable Mechanical strength, improved resistance to erosion, Low Voltage Armoured Cable is vulnerable to mechanical damage and highly vulnerable areas of the design of the wire and cable.
Low-voltage armored cable for fixed laying in the exchange of 50Hz, rated voltage 3kv and below the transmission and distribution lines for transmission power.
① The maximum rated temperature of the cable conductor is 90 ℃.
② short circuit (the longest duration of not more than 5 seconds) cable conductor maximum temperature does not exceed 250 ℃.
Low - voltage armored cable wiring method
Copper braided wire for cable and shielding lead wire. Stripped of the core of the copper shield with the outer layer of the plastic belt, the shield copper belt polished smooth, Low Voltage Armoured Cable with electric iron, solder braided copper braid were welded in the three core copper shield tape. And then use the emery cloth polished armored steel strip welding area, with a soft copper wire and copper shield banded with three armor, and then use the soldering iron, solder braided copper braided with armored steel belt.
Need to withstand greater mechanical power of the cable, should have a armor layer. The most common types of armored cables are: steel tape armored cables and low pressure armored cables. Low-voltage armored cable is divided into coarse and low pressure armored cable (commonly used in submarine cable and larger diameter power cable and other cables) and thin low-pressure armored cable (commonly used in exploration cables, mining cables and control cables and other cables).
In the domestic cable market, steel armored cable occupies a large share; in the foreign cable market, low-voltage armored cable is more common. The most commonly used low-voltage armored cables are steel wire armored power cables and wire armored control cables. Low-voltage armored cable production, should strictly enforce the relevant national standards and international standards (or related technical specifications), to ensure that the armored cable in its use process has a good stability of the structure and performance. Low-voltage armored cable mainly the implementation of the following two product standards and two related standards:
GB / T 12706-2008 "Rated voltage 1kV to 35kV extruded insulated power cables and accessories" (or IEC60502) and GB / T 9330-2008 "Plastic insulated control cables"; GB / T 2952-2008 "Cable outer sheath" And GB / T 3082-2008 "hot-dip galvanized or hot-dip galvanized -5% aluminum-mixed rare earth alloy coating low-carbon steel wire for armored cable"
First, low pressure armored cable related standards and understanding
GB / T12706-2008 "Rated voltage 1kV to 35kV extruded insulated power cables and accessories" (or IEC60502) for the wire armored power cable standard, this standard on the steel armor requirements (according to GB / T12706.1-2008 as an example) :
Material: Wire should be galvanized steel wire. Low Voltage Armoured Cable In the use of AC circuit for single-core cable armor should be non-magnetic materials, non-magnetic wire generally have stainless steel wire, aluminum wire (GB / T12706.1-2008 12.2).
Wire diameter required: wire nominal diameter: 0.8 mm, 1.25 mm, 1.6 mm, 2.0 mm, 2.5 mm, 3.15 mm (12.4 in GB / T12706.1-2008); wire minimum diameter not less than 95% of nominal diameter ( GB / T12706.1-2008 16.7.3).
Armor requirements: wire armor should be tight, even if the gap between the adjacent wire is the smallest (standard GB / T12706.1-2008 12.6).
GB / T9330-2008 "plastic insulated control cable" for the wire armored control cable standard, this standard quoted GB / T2952.1-2008 standard and indirect reference GB / T 3082- 2008 standard, Low Voltage Armoured Cable the steel armor requirements:
Material: The wire should be galvanized steel wire (GB / T9330.1-2008 6.6.2).
Wire diameter required: wire nominal diameter: 0.8 mm, 1.25 mm, 1.6 mm, 2.0 mm, 2.5 mm (GB / T9330.1-2008 6.6.2); wire diameter tolerance should be consistent with GB / T 3082-2008 (GB / T9330.1-2008 6.6).
Armor requirements: steel wire armored by the steel single-layer left or double steel wire inner layer to the right, the outer left to wrap around the lining, Low Voltage Armoured Cable and the sum of the gaps between the wires should not exceed the diameter of a wire GB / T9330.1-2008 6.6.1).