outdoor electrical box consumer unit Introduction:
1. The service life of electrical devices on the power distribution board outdoor electrical box consumer unit decreases due to high temperature
The upper limit of ambient temperature for electrical equipment designed and manufactured in accordance with national standards should not exceed 40 during operation. However, the temperature of the power distribution board exposed to the scorching sun in summer sometimes exceeds 60 due to direct sunlight, heat reflection from the cement floor, and heat generated by equipment in the warehouse. Such a high temperature is easy to cause the insulation of the coil and wire deterioration, damage and burn; The electrical contact temperature is too high, contact resistance increases, contact resistance increases, heating increases, such a vicious cycle will eventually lead to contact burn; In addition, high temperature will affect the stability of electrical protection function, working reliability and measurement accuracy.
2. Install the surge arrester only at the incoming line side. The surge protection cannot cover all devices
Fuses are usually installed between the access and exit lines of the POWER distribution board and the bus. If a lightning strike occurs, the fuse is blown first, and the whole power distribution board loses lightning protection. Many power distribution boards are damaged by lightning every year.
3. Improper installation process leads to overheating and burning of the connecting head
Instead of pressing down on the head of the wire, some electricians used multi-twist wire to screw it around the head of the wire, which burned out soon after the wire was replaced. In the distribution box produced by some manufacturers, the wire pile is connected with the bus, poor heat dissipation, heavy load, and natural failure.
4. If the distribution board outdoor electrical box consumer unit is not checked, it is a potential safety hazard
The products provided by equipment manufacturers have been strictly checked before leaving the factory, but due to the shaking of the road and the vibration of disassembly and assembly, some connecting bolts may be loosened to a certain extent after being shipped to the site, and the guide joints of some outdoor distribution boxes may overheat immediately after leaving the factory.
5. Improper installation position of distribution box not only affects the appearance of the city, but also is vulnerable to external damage. You are advised to select an appropriate installation position.
6, part of the zero protection power supply system still adopts three-phase four-wire power supply mode, low voltage power grid zero line is long, large impedance. When three-phase load is unbalanced, zero-phase current flows through the zero line. At the same time, due to environmental deterioration, wire deterioration, moisture and other factors, the leakage current of the wire also forms a closed loop through the zero line. The zero line has a certain potential, which is not conducive to safe operation.
7, distribution box spacing is too small, electrical and phase gap is small, some have no obvious cut-off point, not only to the electrician's operation has brought danger, but also in the rain and fog weather can not carry out live fuse replacement work; Distribution box generally lack of phase protection, phase loss of mechanical and electrical accidents often occur; Some distribution boxes do not use electronic energy meters, can not perform remote centralized replication; Part of the distribution box closed all year round, lack of regular inspection protection.
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