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To ensure safe use of electricity
- Sep 04, 2017 -

Choose the appropriate wire and cable models, is to ensure the premise of safe electricity. Select the wire and cable models, to consider the use of laying conditions and the safety of the wire can carry the scope. Select the specifications of the wire and cable to consider considering the heat, voltage loss, economic current density, mechanical strength and other 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 high 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. General wire and cable specifications are selected in the table below

Wire and cable safety current related calculation formulas:

The current carrying capacity of the wire is related to the cross section of the conductor. It is also related to the material, type, laying method and ambient temperature of the wire. The factors affecting the calculation are more complicated. The carrying capacity of various conductors can usually be found in the manual. But the use of formulas and then with some simple mental arithmetic, can be directly calculated, do not look up the table.

Wire and cable use Note: more wire and cable knowledge:

       1, home improvement should pay attention to the floor of the building do not all pavement marble. Marble is several times heavier than the weight of floor tiles and wood floors, and if the floor is full of marble, it is possible to overwhelm the floor. Especially on the second floor, because the housing has not been identified by the identification of housing decoration, the weight of its ground decoration materials shall not exceed 40 kg / square meter.

       2, the room decoration, not free to wear holes in the load-bearing walls, the demolition of the balcony and doors and windows connected to the wall and expand the size of the original doors and windows or other doors and windows, this approach will cause local cracks and serious impact on seismic capacity, thus shortening Building life.

       3, balcony, bathroom decoration should try to use the load of small materials, because the balcony over-over will be overturned.

       4, toilet water is also a key part of the renovation. The general practice is to install the toilet before the bathroom, the first to block the floor drain, put more than 5 cm of water, the water test, if the water leakage, must be redo waterproof; if not leak, but also in the construction of careful laying the ground , Do not damage the waterproof layer and unauthorized changes in the water and heating system.

        5, in the room decoration in order to pursue luxury, covered in the walls of the plate, ceiling trim two three-dimensional three-dimensional ceiling, this decoration is not desirable. Because the walls covered with sheet metal, occupy a larger space, will reduce the size of the entire space, the cost is also a higher cost, while not conducive to fire. The ceiling is too low to make the whole room feel depressed.

        6, select the wire to use copper, avoid using aluminum. As the conductivity of aluminum wire is poor, the use of electric wire easy to heat, loose joints or even lead to fire. Also in the construction should also be noted that not directly on the wall trench buried wire, should be used to install the regular casing to avoid leakage and cause a fire.

        7, in the construction should pay attention to avoid the hole in the concrete hole on the hole, drilling, hanging ceiling and the installation of art lighting.

        8, interior decoration to ensure that the gas pipeline and equipment safety requirements, do not unauthorized removal of the pipeline, so as not to affect the normal operation of the system. Also pay attention to the power pipeline and equipment and gas pipeline horizontal net distance of not less than 10 cm, wire and gas pipe cross distance of not less than 3 cm.

        9, the kitchen decoration do not put the gas stove in the wooden cabinet, but can not be the total gas valve package in the wooden cabinet. Once the cabinet fire, gas valve in the fire is difficult to close, the consequences will be disastrous.