According to the report of the Central Broadcasting Network, a suspected three migrant workers in a community in Fuqing City, Fujian Province, had an incident of electrocution and electrocution in the community landscape pool the day before yesterday. Because of fear of electric shock, the three children could only be salvaged with a wooden stick. However, due to the long delay, the three children were sent to the hospital for rescue and died.
Suspected leakage waterscape light
It is said that it is suspected of leakage, in fact, it can basically be determined by the leakage of landscape lights. From the picture of the scene, the water depth is less than 0.5m, and the possibility of drowning is not great.
The landscape pool is different from the general playground. This kind of fountain and landscape pool, as well as some live facilities in the open air, such as substation, street lights, landscape lights in the grass, have the risk of electric leakage due to improper maintenance, which is easy to cause casualties. The pressure of some fountains is very high, and the human body may be injured by the impact of the water column.
At the same time, similar waterscape electrical facilities are designed with reference to the design requirements of the fountain. According to the requirements of the "Electrical Design Code for Civil Buildings", for the fountains that allow people to enter, safety ultra-low voltage supply should be adopted, and the AC voltage should not exceed 12 volts; the fountains that are not allowed to enter can be safely operated with an AC voltage of not more than 50 volts. Very low voltage power supply.
In addition, landscape lights, ground lights, and guide lights like this measure up to 100 degrees, and the places where these lights are located are public areas with some people's flow angles. Children or people who don't pay careful attention are vulnerable to burns and other injuries. .
After the incident was reported, Xiaobian found that the thoughts released by one of the netizens were worth sharing and discussion.
@艺尚国际 Jiang Jin:
The design of the Fujian fountain caused by electrocution caused me to be the first part of the lighting designer: When the human body touches the charged body, it will be shocked. The magnitude of the electric shock current is determined by the contact voltage and the impedance of the human body. China's safety voltage is as follows: 50V under condition 1 (dry or wet area, dry skin, high-resistance ground); 24V under condition 2 (wet area, wet skin, low-resistance ground);
Condition 3 means that the skin resistance and water resistance are negligible when the person is immersed in water. The safety voltage at this time is not specified by the IEC, but it is stated in the preparation instructions: “For example, no more than 12Vâ€. There is no regulation in China, and Japan is set at 2.5V. Therefore, the designers have noticed that the wading luminaire design should be designed to be lower than 12V, and the waterproof switch power supply must be kept away from the wading area and strictly waterproof.
To the lighting designer, the second part: the metal casing of the wading lamps and electrical equipment, in the case of reliable grounding, also needs to be locally equipotential bonding, because the metal casing of the electrical equipment has been connected with the PE wire. And connected by the PE wire and the grounding body, but the potential of the metal casing connected to the PE wire is not necessarily the ground potential, when there is leakage current in the PE wire, especially when the device is far away from the grounding body, due to the PE wire There is a resistance, and at this time, the potential of the casing may have a potential sufficient to cause damage, and thus there is a risk of electric shock. When the equipotential bonding is made, even if the potential of the device casing is much higher than the ground potential, the metal objects that the human body may touch are at the same potential. Therefore, talents will not be shocked.
@FELIX ^o^:
IP68 waterproof, very important, often see the wiring inside the pool is wrapped with waterproof tape. As a professional manufacturer of IP68 waterproof connectors, I feel very uncomfortable. However, the current domestic reality is that many engineering companies and construction parties are too cost-conscious, and a cheaper product with 1 yuan will never use a more cost-effective and safer 10 yuan. We sell very well abroad, but the first feeling of many domestic purchases is too expensive. If we do not consider quality and safety, we will choose low-cost bargains. So this kind of safety accident always appears. I hope that the peers will guide the guests from a professional perspective and will always be the first safety.
@A01 Mirage Lighting Ma Wentao:
Frequently, customers ask for a 220V underwater light, and they are not sold to him. They are strongly advised to use low pressure. Most customers will follow the advice, and some customers will go to other places to find it. Once again, it is strongly recommended not to sell high-pressure underwater lights. produce! Can't make this money, for peace of mind!
Regarding the frequent occurrence of leakage of lighting fixtures, what opinions or suggestions do you have?
Everyone is welcome to participate in the discussion and see what they see.
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