Are newbies who are new to LED display installation often confused by the position of the power switch? Especially when I heard that I wanted to use a 4 square power cord, my mind was full of questions: Where to connect this cord? Is the switch installed on the wall or hidden behind the machine? Today, I will use years of practical experience to break it apart for you and explain it clearly - how novices can quickly master the power layout skills in LED screen installation.

1. Three basic knowledge before installation

Friends who can't figure out the position of the power switch are most likely​The preparations before installation are not in place​​. Just like when you don’t prepare all the ingredients for cooking, there will definitely be problems when you are busy. Let me talk about a few key points first:

• ​Tool Preparation​: Electric drill, wire stripper, and multimeter are like chef's knives and pots. No matter what you lack, you can't start the work (web page 5)
• ​Material confirmation​: 4 square meters of power cord is not a random choice. For example, the wires provided by our company to customers are all pressed.Peak power + safety redundancy​Computed by double standard. For example: The power consumption per square meter of P2.5 display is about 800W, and the total power of the 2m x 3m screen is close to 5000W. At this time, it can only withstand the 4 square wire (Web page 2)
• ​Environmental Inspection​: I have seen too many cases of installing switches in fire escapes.​The power switch must be installed near the dedicated distribution box​​, you must also avoid air conditioning air outlets and fire sprinklers (web page 8)

2. Three common forms of switch position

​​The core question is - where is the 4-square-wire power switch installed?​According to our experience in making plans for clients in more than 110 countries, there are three main situations:

1. ​​Ceve concealed installation​
   Suitable for high-end places such as shopping malls and exhibition halls, hiding the air switch in the ceiling maintenance port. Two points to pay attention to:

   • Must be installed on the ceiling keelIndependent support frame​, prevent the switch box from falling (Web page 4)
   • The size of the maintenance port is 10cm larger than the switch box, which is convenient for later maintenance (Web page 5)

2. ​​Surface-mounted wall​
   The most common way, but many people make low-level mistakes:

   • The bottom margin of the switch is 1.8 meters, the most suitable one is,Don't install it directly behind the display​! Once, the customer hid the switch on the back of the screen, and as a result, half of the screen had to be removed during maintenance (Web page 6)
   • Remember to install outdoor projects​Waterproof box​, the project we have done for Southeast Asian customers, also needs to put desiccant in the waterproof box (web page 7)

3. ​​Cabinet integrated​
   This method is commonly used for professional performance rental screens, and the key points are to look at two points:

   • The switch must be installed in a separate compartment with the cooling fan. Our tests found that the installation of the same compartment will shorten the switch life by 40% (Web page 8)
   • The 4-square-line inlet should be installed​Magnetic loop filter​​, especially places with strong electromagnetic interference such as stadiums (web page 3)

3. Five major minefields for practical wiring

After determining the switch position, the next step is the highlight - connecting to the 4 square power cord. Newbie often fail in these places:

1. ​​Tied thread processing​
   The stripping length is most suitable for controlling the length of the wire at 1.2cm. It is too short and poor contact, and it is easy to short circuit if it is too long. I have seen someone who strips the wire with a utility knife, and cuts the copper wire halfway (Web page 2)

2. ​Terminal crimping​
   Must useHydraulic clamps​Crimped OT terminals, manual twisting can't withstand high current at all. Last year, a customer used a hand twist, and the terminal was melted after half a year (Web page 6)

3. ​Phase assignment​
   Three-phase electrical distribution must be followed​The principle of equal division of red, yellow and blue​​, don't connect all live wires to the same phase. The most outrageous case we engineers have ever brought - three live wires are connected to phase A, which leads to tripping (Web page 5)

4. ​​Grounding inspection​
   When using a multimeter to measure the ground resistance, many novices directly measure the ground wire to the neutral voltage. The correct method is​Ground resistance to ground ≤3Ω​(Web page 8)

5. ​Power-on test​
   Do not turn on the main gate directly when powering on for the first time! You have to take your pulse like an old Chinese doctor:

   • Disconnect the display screen first to power
   • Test the voltage fluctuation at the output end of the switch ≤5%
   • Finally, turn on the screen power supply (web page 4)

4. Ask and answer high-frequency questions

​​Q: Why does my switch always trip?​​
A: Ninety percent of these three issues:

• Power calculation is wrong: actual power consumption = screen area × unit power consumption × 1.2 safety factor (web page 2)
• The line has hidden damage: use a shaker to measure the insulation resistance, and change the line as soon as possible (web page 6)
• Switch selection is wrong: 4 square wire should be equipped with 40A or above empty space, do not use ordinary lighting switches (web page 5)

​​Q: Can multiple small switches be used instead of the main control?​​
A: A big taboo! We have done a comparison experiment:

• The failure rate of the sub-control solution is 3 times higher than that of the total control
• Multiple switches parallelize will cause current imbalance (Web page 3)
• Can be installed in special circumstancesSmart distribution cabinet​, but the cost will double (web page 8)

After all, the position of the power switch is not metaphysical, but a systematic engineering that can be traced. Next time you encounter installation problems, remember these eight-character tips:​"Power calculation, short path"​​. Just like the project our company has done for Tokyo Gymnasium, we used BIM modeling to rehearse all the routes in advance, and the on-site installation is passed the acceptance. Although I am talking so carefully now, I also worked hard on the construction site to pay a lot of tuition fees. I hope these practical experiences can help novices avoid detours for two years.

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