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Frequently Asked Questions from TANO CABLE

What industry uses control cable?
Control cables are used in factory equipment, power plants, switch gear, and where there is control equipment.
What happen to the Electric wire when bent?
If conventional cable bend radius is less than the minimum radius the cable insulation can't reach standard thickness because of convex curvature of cable end excessive bending, thus affecting the insulation effect, lead to cable breakdown, or even cause a fire or other accidents.
If the electric wire is armored cable, the problem is more serious, because bending over with armor will pierce the outer sheath and inner insulation, leading to accidents.
When you install the bridge, the bridge should be done to meet the bending radius. Do not install 90 degree; you can use two 45-degree angle cut to meet the 90 elbow.
How to lay underground cable?
Underground cable laying technical requirements
1. Identify circuit trend: identify the circuit trend according to electricity distribution requirements and design drawings;
2. Burial depth should generally be in deep underground 0.7m, when it is close proximity with other channels and other cable should be buried in the depths of 1m;
3. The bottom of underground cable ditch must be flat, or spread a thick 100mm of fine soil in the ditch, and the installation of signs on the ground;
4. When the underground cables lay cross the road should wear sleeve protection;
5. Metallic sheath ends of armored cables and lead sheathed cables must be grounded.
6. There are a variety of cable lines laying method, commonly used methods are buried laying, cable trench laying, tunnel laying pipe laying and brightly laying indoor and outdoor.
Underground cable circuit laying method
1. Firstly, dig trenches. underground cable laying need to dig a trench depth of about 0. 8m on the ground, trench width is 0. 6m. After the formation of the ditch covered with 100mm thick fine sand as underground cables cushion.
2. Cable laying usually divided into two kinds manual laying and mechanical traction. Manual laying is used for laying cables with small size, two people stood on both sides of the cable channel, carrying cable tray forward slowly along the laying direction, gradually release the cable reel, fall into the trench; mechanical traction is used for any size cables, every two meters to place a wheel in cable ditch, located pay-off rack at one end of the cable channel, placed winch or windlass at the other end, 8 to 10 meters i minute to pull the cable out, falls on the wheel, then withdraw the wheel, the cable loosely deposited in the ditch, to extend and retract. On the cable and then covered with 100mm thick soft soil or fine sand, covered with brick or concrete cover, covering both sides of the cable diameter should exceed the width 5omm finally filling in the cable trench backfill above the ground to 150- 200mm, and at both ends of the cable line, intermediate and corner joints erected Flag piles.
3. Finished the intermediate connector and terminal head of cable, cable construction is going to complete, before delivery, it must be do related tests.
Main characteristics of split-phase metal sheath power cables
Waterproof wire and cable research and development has been a problem in the main study, after many long and repeated experiments we can found that even if the insulating sheath is not broken, there will be some water or moisture seeped into the core of power cables. Thus, it is generally considered that improving three core waterproof cables to three single core waterproof cables structure is better when medium voltage power cables or low voltage power cables applied to real-life.
We can produce cables based on the structure of single core medium voltage waterproof power cable, then stranding three single core cables instead of three core cables. Water-blocking effect of improved water proof power cable will be better, and the structure become simple, it is not only save water blocking and cost, but also improve the carrying capacity and heat dissipation potential of power cables on the other hand, ease of manufacture, and easier to install. The most important is to prevent the ingress of moisture inside the cable, keep dry insulated core, to further extend the life of the cable.
Specifications of split-phase metal compartment power cables
1. Specifications of power cable core
Conductor should be metallized or non-metallized annealed copper, aluminum, or aluminum alloy which consistent with GB/ T3956 type 1 or type 2, it also can be bare copper or metallization annealed copper conductor consistent with GB T3956 type 5, Insulation, metal shielding (if any), cabling, inner sheath (if any), the outer jacket to meet GB /T12706 relevant standards.
2. Specifications of split-phase metal sheath
After the completion of phase metal sheath. we need test for cables inflate, the test should be met. cable filled 50-100KPa dry air or nitrogen, total length of the cable after the pressure equalization within 3h, the air pressure in the cable should not be reduced.
3. The integrated waterproof specifications of metal power cable
Cable finished product soaked in water 72 hours then the case of the surface except the insulating structure, observe the surface should be dry Phase metal sheath water poof power cable manufacturing process is simple, all aspects of performance are more excellent, and it is suitable for medium and low voltage cable selection.
How to identify good quality cable or poor quality cable?
1. Check printed label carefully, whether the printing is illegible. It means to see printed words on the label and the insulated sheath, if there are typos or printed shades, vague words, you need to pay attention. 2. Twist insulation sheath with hand, check whether it fades or lose word. Twist insulation sheath with your fingers, insulation sheath of poor quality cable is easy
to fade, especially red insulation sheath and printed word is easy to rub away. 3. Scratch or nip insulation sheath of cable with nails. it is poor quality cable if you can pinch off the insulation sheath. 4. Bend insulation sheath repeatedly, and check whether it will break after three to four times. If break, it is poor quality cable because its insulation sheath is very bad. 5. Fire the insulation sheath of cable, check whether it will self-ignite when fire off. If it will self-ignite, it is poor quality cable. 6. Check the conductor. The conductor of cable is common aluminum and copper if the conductor color is dark and no metallic luster, it is poor quality cable. 7. Measure inner diameters and outer diameters, and then weigh the cable. Measure the inner and outer diameters of cable insulation sheath the tolerance is ±10%. If it exceeds the tolerance it is poor quality cable.
Why flexible mine insulated fire resistant cable have good fire resistance performance?
Superior high temperature resistance and fire resistance performance.
General wire and cable insulation due to the use of organic polymer materials are therefore highly carbonized under fire conditions and thus lose insulation Flexible mine insulated fire resistant cable main materials is mineral compounds, which in itself does not cause a fire, can not burn or support combustion. These materials generally have a higher melting point above 1500 C, so even for fire resistant cable under fire conditions can also play a normal transmission function, it is a real fire cable sense. And through the BS6387 C, W, Z test.

Strong overload
Flexible mine insulated fire resistant cable ampacity is large, and has a strong circuit overload, according to the relevant electrical design requirements that cable surface temperature is usually not higher than 70℃, if there isn’t combustibles around, Flexible mine insulated fire resistant cable long-term working temperature can reach overload 250℃.