​​Do you know? ​ ​Last year, an investigation into the fire of a large LED screen in a shopping mall showed that the problem was that the wrong installation location of the distribution cabinet was selected! At that time, the maintenance staff opened the back cover and saw that the distribution cabinet was actually close to the air conditioner external unit, and the high temperature caused the line to age. This is not an isolated case. The most troublesome thing for beginners to install LED screens is where to place this black box. Today we will break it apart and talk about how to find a "Feng Shui Treasure Land" for it.

Three golden rules for choosing the location of the distribution cabinet

​​The first thing to look at the environment:​​
Outdoor installations must avoid these "death areas":

• ​​Puddles​ ​: Last year's typhoon season, the LED screen in a city square was short-circuited because the distribution cabinet was installed on the edge of the drainage ditch.
• ​​Heat source encirclement​ ​: At least 1.5 meters away from the air conditioner external unit, do not shorten the service life of the equipment
• ​​Highly crowded areas​ ​: Shopping mall aisles and fire escapes are absolutely not good, so you have to find corners

​​The second look at maintenance:​​
Remember three principles of "just reach out":

1. You can open the access door with your hand (don't let the pipe block it)
2. You can touch the operation button with your hand (don't install 2 meters high)
3. You can plug in the tester with your hand (leave enough 50cm of operating space)

​​The third thing is to look at safety:​​
The protection level starts with IP43 at least. If it is installed by the river and beach, it must be upgraded to IP55 before insurance. The iron shell of the distribution cabinet must be grounded, and the grounding wire must be made of yellow and green two-color wires. Do not connect it casually in order to save trouble.

Installation location comparison analysis

​​Special attention:​ ​The power distribution cabinet should not be more than 8 meters away from the display screen, as the voltage will drop significantly beyond this distance. If you really want to stretch it, the cable must be thickened by a specification. For example, if you originally planned to use 6 square lines, you have to replace them with 10 square meters.

5 Pocket Avoidance Guides for Beginners

1. ​​Don't believe it, "It's almost done"​​
   Last year, a county town installed screens and the master said, "It's okay to put the corners of the walls." As a result, water seepage on the walls during the rainy season caused a short circuit. Remember: the bottom of the distribution cabinet is 15cm higher than the installation plane, and it is safest to mount a cement platform underneath.

2. ​​The line interface needs to be "referenced to the seat"​​
   Use red for live wire and blue for neutral wire. The ground wire must be yellow-green. If the connection is reversed, it will trip at the least, and burn the board at the worst. A construction site connected the phase sequence in reverse and smoke came out directly when the computer was turned on.

3. ​​Lightning protection is not just about installing a lightning rod​​
   Level 3 protection must be equipped with the main distribution box: the first-level lightning protection device is installed with the second-level lightning box, and the third-level internal display screen is installed. The most exaggerated case I have ever seen, only lightning rods were installed, but the control card was still broken when the lightning strike hit.

4. ​​The heat dissipation hole is not a decoration​​
   Never pile up debris at the heat dissipation port! A cinema piled leaflets on the top of the distribution cabinet, but the power module was burned due to poor heat dissipation. The front and rear maintenance fee is enough to buy three new distribution cabinets.

5. ​​Check regularly and don't be lazy​​
   It is recommended to conduct a comprehensive inspection every quarter:

• Is the screw rusted (especially seaside projects)
• Terminal temperature (beware if it exceeds 60℃)
• Is the insulating rubber cracked (replace it quickly if it ages)

Self-question time

​​Q: Can the distribution cabinet be installed in the open air? ​ ​
A: Yes! But three conditions must be met: high protection level (at least IP54), awning well, and a monthly cleaning of heat dissipation holes. There is a scenic spot project that has been installed in the open air for three years and is still running steadily. The key is that they send people to clean up the fallen leaves and dust every week.

​​Q: How to arrange multiple distribution cabinets? ​ ​
A: Remember the principle of "three-three": the distance between the cabinet is ≥30cm, away from the wall is ≥30cm, and the operation channel is ≥30cm. The most professional installation team I have ever seen, and I also use a laser level to align the cabinet. It is comfortable to see the obsessive-compulsive disorder.

​​Q: What should I do if there is not enough space for renovation of old buildings? ​ ​
A: Try the wall-mounted distribution cabinet, the thickness can reach 18cm. Last year, a historical building renovation project disguised the distribution cabinet as a decorative picture frame, which was both practical and did not destroy the overall style.

​​Editor's opinion:​​
I have seen too many projects being installed on distribution cabinets, but in fact, the core is just twelve words——​ ​Select the right position, regular line, regular maintenance​ ​. Don’t think that this is a trivial matter. Sometimes success or failure lies in these details. Before installing the screen next time, remember to take a tape measure to measure the installation position three times. This skill is absolutely not saved!

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