Frequently Asked Questions on Electrical Circuits and Appliances

First, why should we replace the aging wire in time?

In general, the wires are insulated wires. Under normal conditions, the insulation is good and the lines do not collide with each other. However, ordinary rubber-plastic insulated wires will be used after a long period of time; day-to-day aging, especially in the open air, is more likely to age due to wind, rain, and sun exposure, which greatly reduces the insulation performance, and often causes moisture in the rain to cause short-circuit between wires. If it is further aged, the insulation layer may be peeled off. Once the two bare wires touch each other, an electric spark is generated, which may ignite the combustible material and cause a fire. Therefore, always test the insulation of the line, if it is found to be aging, replace it immediately to ensure safety.

Second, how is the fire risk of fluorescent lamps?

The fire hazard of fluorescent lamps is mainly due to the burning of combustibles due to the heating of the ballast. The ballast consists of a core and a coil. During normal operation, the ballast itself consumes electricity and has a certain temperature. If the heat dissipation condition is not good or the lamp is not properly matched, and other accessories are faulty, the internal temperature rise can damage the insulation strength of the coil and form the daytime. The short circuit generates a high temperature, causing the surrounding combustibles to ignite and catch fire.

3. What fire protection measures are commonly used for lamps?

The distance between incandescent lamps, high-pressure mercury lamps and combustibles should not be less than 50cm, and tungsten halogen lamps should be greater than 5Ocm. It is strictly forbidden to cover the lamps with flammable materials such as paper and cloth. The wires near the lamps of incandescent lamps and tungsten halogen lamps above 10 OW shall be protected by non-combustible materials (casing made of porcelain tubes, asbestos and glass filaments. Normal conductors shall not be used to avoid high temperature damage to the insulation and cause short circuit. Stack flammable items.

The height of the light bulb from the ground is generally not less than 2m. If it is less than 2m, protective measures can be taken. Locations that are frequently collided should be protected by a metal mesh cover, and measures with high humidity should be protected against water droplets.

When installing the fluorescent lamp ballast, pay attention to ventilation and heat dissipation. It is not allowed to directly fix the ballast on the flammable ceiling or slab. The voltage and capacity of the ballast and the lamp must be the same and used together.

In low-voltage lighting, it is necessary to select a sufficient cross-section of the conductor to prevent excessive heat generation and cause danger. Where there is a large amount of flammable dust, such as grain processing plants, cotton factories, etc., dust-proof lamps should be used. Explosion-proof lighting fixtures should be installed in the explosion site.

4. What is the significance of synthetic fiber to eliminate static electricity?

Synthetic fibers have superior physical and mechanical properties and chemical resistance, and are widely used in clothing and industry. However, since synthetic fibers are mostly organic polymers, and the molecules are covalently bonded, they cannot be ionized. It does not transmit electrons and it is easy to accumulate static electricity. In addition, they have a small polar group and a high degree of water repellency, which generates a large amount of static electricity during use, which not only affects its take-up and processing properties, but also causes disasters. There are many fire and explosion accidents caused by the static electricity of synthetic fibers. For example, when a worker poured gasoline into a lead drum from a drum, the lead barrel caught fire. The reason was that the chemical fiber clothing worn by the worker had a spark discharge when it touched the lead barrel. Therefore, solving the static electricity of synthetic fibers is not only important for improving the taking value of synthetic fibers, but also necessary for fireproofing and explosion-proof.

5. What are the safety requirements for ordinary resistance heating furnaces?

Ordinary resistance heating furnaces generally have two parts: furnace body and electrical control equipment. The main safety issue is: 1 wire and resistor should be connected reliably. If the connection is not good, the contact resistance will be too large, the contact will be overheated, the contact surface will be oxidized, and even an arc will cause a fire. 2 The furnace lining of the resistance heating furnace should have good thermal insulation performance. The temperature rise of the outer wall of the electric furnace should generally not exceed 60 degrees Celsius; the high temperature furnace should not exceed 90 degrees Celsius. Do not store combustibles near the stove. 3 resistance heating furnace should be equipped with temperature control device and alarm device (alarm when abnormal temperature rises). Electrical equipment should be repaired frequently; the wire at the mouth of the furnace should be protected by a sheath of non-combustible material (usually a porcelain tube). The resistance heating furnace should be provided with a separate power switch and fuse protection. The furnace should not be placed in buildings below the primary and secondary fire rating.

6. What are the fire hazards of electric ovens? How to prevent it?

Electric ovens have a wide range of dry substances, but some flammable and flammable substances, such as too high a temperature, take too long to cause burning or even explosion. The electric oven uses a large amount of electricity, and should prevent the wire from being overloaded. It should be powered by a separate line and install suitable switches and fuses. The wiring of the wire and the heat element should be fastened, and the oven lead wire should be protected by a high temperature resistant insulating material. Insulation packing should be used between the outer wall of the oven and the heating element. No flammable or combustible material should be placed around the oven. The inner bracket of the oven shall be made of non-combustible material and the combustibles on the bracket shall be removed frequently. Combustible items that need to be dried should be placed on a fixed bracket and should not be in direct contact with the thermal element. Electric ovens are not allowed to dry flammable and explosive materials such as nitrocellulose and celluloid. Objects with a flammable liquid volatilization are absolutely prohibited from drying in an electric oven.

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