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Welding Cable Specify The Required Construction And Installation
- Jul 03, 2017 -

The general principle of Welding Cable selection

In the selection of Welding Cable, the general attention to Welding Cable models, specifications (conductor cross-section) choice.

⒈ Welding Cable model selection

When using Welding Cable, consider the use, laying conditions and safety; for example,

According to the use of different, can choose power cables, overhead insulated cables, control cables;

According to the different conditions of laying, can choose the general plastic insulated cable, steel armored cable, steel armored cable, anti - corrosion cable;

According to the safety requirements, can choose non-flame retardant cable, flame retardant cable, halogen-free flame retardant cable, fire-resistant cable. ⒉ Welding Cable specifications of the choice

Determine the use of Welding Cable specifications (conductor cross-section), the general should consider the heat, voltage loss, economic current density, mechanical strength and other selection conditions.

According to experience, low-voltage power line because of its large load current, it is generally the first choice according to heat conditions cross-section, and then check the voltage loss and mechanical strength; low-voltage lighting line because of its higher voltage level requirements, Select the cross-section, and then check the heat conditions and mechanical strength; for high-voltage lines, the first by the economic current density selection section, and then check the heat conditions and allow the voltage loss; and high-voltage overhead lines, but also check its mechanical strength. If the user has no experience, should consult the relevant professional units or people's views.

⒈ transport is strictly prohibited from the height of the cable or cable with a cable tray, especially at lower temperatures (usually about 5 ℃ and below), throwing, dropping the cable will likely lead to insulation, sheath cracking.

⒉ As far as possible to avoid in the open air to store the cable, cable tray is not allowed to flat.

⒊ lifting package, it is strictly prohibited at the same time several sets of lifting. In vehicles, ships and other means of transport, the cable tray to be used to fix the appropriate way to prevent collision or overturned to prevent mechanical damage to the cable.

⒋ cable is strictly prohibited with acid, alkali and mineral oil contact, with these corrosive substances isolated storage. Storage of the cable in the warehouse shall not be damaged and the presence of harmful gases that corrode the metal.

⒌ cable during storage, should be regularly rolling (summer 3 months once, other seasons may be appropriate extension). Scrolling, will be stored down the disk side up, so as not to decay the bottom of the damp. Always pay attention to whether the cable head is intact when storing.

⒍ cable storage period to the product factory limited to the general should not be more than a year and a half, the longest no more than two years.

The design and construction of the installation of Welding Cable shall be carried out according to the relevant provisions of GB 50217-94 "Code for Electric Power Engineering Cable" and adopt the necessary cable accessories (terminals and fittings). The quality, safety and reliability of the power supply system are not only related to the quality of the Welding Cable itself, but also to the construction quality of the cable accessories and lines. Through the analysis of line failure statistics, due to construction, installation and connection and other factors often lead to fault than the Welding Cable body defects caused by the possibility of failure is much greater. Therefore, the correct selection of Welding Cable and accessories, in addition to the requirements of the design and construction, but also should pay attention to the following aspects:

⒈ cable laying installation should be qualified professional units or professionals, do not meet the requirements of the relevant provisions of the construction and installation, may cause the cable system can not run properly.

⒉ human laying the cable, the command should be unified command rhythm, every 1.5 to 3 meters have a shoulder cable, while pulling side pull, slowly cast.

⒊ mechanical cast cable, the general use of special cable laying machine and equipped with the necessary traction tools, traction size appropriate, uniform control, so as not to damage the cable.

⒋ before the release of cable, to check the appearance of the cable and the head is intact, pay attention to the direction of rotation of the cable tray, do not flatten or scratch the cable outer jacket, in the winter when the low temperature should not be beaten way to straighten the cable, To avoid insulation, sheath cracking.

⒌ laying the cable when the bending radius is greater than the specified value. Before the installation of the cable laying, after the installation with 1000V megger to measure the insulation resistance between the conductors of the cable is normal, and according to the cable model specifications, length and ambient temperature of the measurement results are properly modified, small size (10mm 2 below Core conductor) cable should also measure whether the conductor off.

⒍ cable such as direct burial laying, pay attention to soil conditions, the general building under the cable buried depth of not less than 0.3 meters, more soft or the surrounding environment is more complex, such as arable land, construction sites or roads, etc., there must be some buried Depth (0.7 ~ 1 m), to prevent the buried cable accidental damage, if necessary, should be erected obvious signs.