JZD Wire & Cable Factory
More Than 20 Years Experience
More Than 20 Years Experience
Author: Joey 
July 09,2022
Although it is said that solar dc cables are low-smoke halogen-free and flame-retardant, flame-retardant photovoltaic cables are not the only choice for many solar construction project engineering teams, because the users they serve are different in economy. The trend I love is that flame retardant photovoltaic cables are expensive in the photovoltaic cable industry, so many people are forced to use photovoltaic cables that are not flame retardant. Therefore, there are many solar energy occasions that fire from time to time. What are the reasons for the fire? Let's discuss it below.
The laying and installation of photovoltaic cables did not meet the standard requirements. The solar engineering contractor did not lay photovoltaic cables according to the specified requirements, the process equipment was poor, and the photovoltaic cable laying process was not strictly implemented. There is no supervision, self-inspection and mutual inspection in the installation process, which makes the completed photovoltaic cable line unsafe, frequent accidents, and easy to cause fire during operation.
2. There is a short circuit in the photovoltaic cable
When the two wires of the AC circuit are in contact with each other, a short circuit occurs, and the current does not flow through the electrical equipment in the circuit, but directly forms a loop. The resistance of the photovoltaic cable itself is small. If only through the loop of the photovoltaic cable, the current will increase sharply, tens or hundreds of times the normal value. Because the resistivity of the conductor of the photovoltaic cable is too high, heat will be generated when it is energized, and sometimes the conductor will heat up in a short period of time and continue to heat up to thousands of degrees, enough to ignite nearby combustibles, so a fire occurs.
Photovoltaic cables are overloaded and heated, ultraviolet rays, ambient temperature changes, photovoltaic cable heat dissipation conditions, and contact with atmospheric and environmental chemicals will cause photovoltaic cable insulation and outer sheaths to age. Among them, the severe overload of photovoltaic cables is the most important factor to accelerate the aging of cable insulation. The main reason is that there is information that the long-term overload working temperature of photovoltaic cables exceeds the allowable long-term working temperature of insulation by 90°, and the insulation life of photovoltaic cables will be halved. If it is not replaced in time, it is easy to cause a short circuit of the cable and cause a fire.
Measures to prevent photovoltaic cables from catching fire
The electrical wiring must be installed in strict accordance with the electrical installation regulations, professional electricians must be hired for the wiring of the solar power station, and the electricians must be certified.
Choose an appropriately sized circuit. Don't use too thin or poor quality PV cables to make them cheap. When choosing a photovoltaic cable, please pay attention to check whether it is a qualified product.
3. Safe use of photovoltaic cables
Do not arbitrarily pull, connect or add PV cables that have been laid at will, which will cause the overall electrical load of the line. Pay attention to understand the maximum load of the circuit used, and do not exceed this limit during use, otherwise it will easily cause an accident.
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