Recently, a circle of friends rumored that a girl leaked electricity and caused a girl to be electrocuted. I saw that I was in the throat (because the video content is too sorrowful, Xiaobian puts a picture and wants to see it myself).
It is rumored that the incident occurred in a certain district of Shenzhen and was subsequently verified by the media. This is a leakage event in the swimming pool of a seaside five-star hotel in Vietnam on July 21, 2015. How many such security risks are there around our lives? How to buy and install pool lights? How to choose LED underwater lighting?
How to choose LED underwater lighting?
To purchase and use an LED underwater light, we should consider the following points:
1, low voltage (required!!!)
The national standard has clear requirements, all underwater lamps must work in a safe low voltage! Usually 12-24V.
2, IP68 protection level (6, 8 is representative of dust and water resistance)
The degree of protection for luminaires used for long-term underwater use must be IP68!
What is IP68?
Please see the table below:
3, the lamp housing material
Different luminaire housings have different application scenarios, and we can select suitable underwater luminaires according to factors such as site and budget. If it is used in water for a long time, the outer casing of the underwater luminaire should be corrosion-resistant. LED underwater lights with stainless steel casing or ABS plastic casing are available.
4, the transformer
Just talked about safety voltage and waterproofing. If you can't use the mains voltage we use every day, you must have a transformer. Since the swimming pool is usually outdoors, the transformer also needs to be waterproof!
As for the specific degree of protection, depending on the installation conditions of the voltage device, if it is installed in the distribution box, the distribution box should be waterproofed. If the appliance is installed outdoors, the appliance's own protection level should meet the outdoor use standard, at least IP65.
Outdoor waterproof transformer: Fully waterproof transformer for filling glue, can be buried in the green belt outside the pool.
Choosing a luminaire that meets the requirements does not mean that everything is OK. On-site construction and installation is an important part:
Installation and construction precautions
1, do not directly use 220V voltage test light
This is a mistake often made, using 220V voltage to directly test the low-pressure underwater lighting, the result is burning!
2, to be waterproof during installation, use waterproof cable!
When doing waterproof construction, you must make sure that you have to do it again and again. If the installation master is not working properly during construction, it may cause water in the wire and damage to the lamp. Also, the cable must be suitable for underwater use!
3, underwater lights can not be too far from the transformer
The wire will also have a resistance, which will divide a part of the voltage, resulting in the voltage of the underwater light is less than 12V. If a certain voltage is not reached, the luminaire will not light up normally. Therefore, the distance of the underwater light from the transformer outlet should not be too far. If the distance is too far, you can increase the number of transformers to solve.
4, according to the total power of the underwater light configuration size transformer
In general, a transformer usage rate of 75% is appropriate, that is, a 100W transformer is a lamp with a displacement of more than 75W. Also have to pay attention to the transformer's in and out line!
As long as it meets the safety regulations for installation and use (if you can't identify it, then you can only use the credit of the developer to help judge), whether it is a pool or other places, everyone can use it with confidence, but if it is illegal, don't Said to be a swimming pool, many places need to pay attention.
For example, the situation seen a few days ago:
Finally, an electric shock
With the increasing use of electricity in daily life. The occurrence of electric shock and electric shock will also increase. Some people see that the first reaction to someone's electric shock is often to push forward, but the result is often to save people from being injured or even life-threatening.
1. When an electric shock occurs at home, we should directly find the main switch pull-off and power-off at the first time. This is the safest way. Insulated objects can also be used to separate the electric shock from the power source.
2. When you find the electric shock in the outdoor, don't rush to save people and rush to the brain. We should calm down and find objects that can be insulated to pick up the wires. But at the same time, we must pay attention to protect ourselves. We can step on insulated objects such as wooden boards or wooden benches or wear rubber shoes to ensure insulation under the feet.
3. After the electric shocker is disconnected from the power supply, we can check the pulse heartbeat first. If there is no heartbeat, we should immediately perform cardiopulmonary resuscitation on him and insist until the ambulance arrives.
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