When installing the LED display, the LEDs need to be grounded, and there are corresponding precautions when grounding. Many novices are not very familiar with this, resulting in many problems after installation. Shandong LED display today will talk about LED grounding precautions.
1. Each power supply must be grounded from the ground terminal and locked;
2. The grounding resistance shall not be greater than 4Ω;
3. The ground wire should be an exclusive wire, and it is strictly forbidden to connect with the neutral wire;
4. No air circuit breaker or fuse shall be installed on the ground wire;
5. The ground wire and the ground terminal should be more than 20 away from the lightning protection ground terminal;
It is strictly forbidden for some equipment to use protective grounding instead of protective zero connection, resulting in mixed connection of protective grounding and protective zero connection. When the insulation of a protective grounding device is damaged and the phase line touches the shell, the neutral line will have a voltage to the ground, so that a dangerous voltage will be generated on the shell of the protective grounding device.
Therefore, in the line powered by the same bus, the protective grounding and the protective zero connection cannot be mixed, that is, one part of the electrical equipment cannot be connected to zero and another part of the electrical equipment is grounded. Generally, the mains is connected to zero protection, so the electrical equipment using mains should be connected to zero protection.
