Surge Protector Wiring Diagram - Click To View

Surge protector, also called lightning arrester, is an electronic device that provides safety protection for various electronic equipment, instruments and meters, and communication lines. When a spike current or voltage suddenly occurs in an electrical circuit or communication line due to external interference, the surge protection device can conduct and shunt in a very short time, thereby preventing the surge from damaging other equipment in the circuit. However, it is not very clear how to connect the surge protector and where to connect it.

In fact, in the power supply line, surge protective device at all levels should be installed at the entrance of the line into the building, the interface of the lightning protection zone, and near the protected equipment. The connecting wires of surge protectors at all levels should be short and straight, and fixed firmly. The connection terminals of the surge protector should be connected to the same-name end phase line of the line in the distribution box at the lower pile head of the switch and fuse at this level, and the grounding terminal of the surge protector should be connected to the equipotential grounding terminal board in the lightning protection zone at the shortest distance. The protective grounding wire (PE) of the distribution box should be directly connected to the equipotential grounding terminal board.

The surge protector of the power line with terminal blocks should be crimped; the surge protector with terminal blocks is connected with the terminal blocks.

And different occasions have different power requirements, so many power supply systems are derived. In addition to the common single-phase system, there are TT system, TN-C system, TN-S system, etc., so the surge protector has also developed different models to correspond to these power supply systems.

The wiring of the surge protector in the single-phase system, the 2P surge protector is designed as this standard, single-phase three-wire, two-hole L port connects the live wire, N port ground wire, PE port ground wire.

The wiring of the surge protector in the TT system, the TT system is a system in which the power system has one point of direct grounding. The grounding of the exposed conductive part of the equipment is electrically unrelated to the grounding of the power system.

The wiring of the surge protector in the TN-C system, the TN-C system is a system in which the protection neutral line of the trunk part and the working neutral line are completely shared, which is suitable for places without explosion hazards and good safety conditions.

The wiring of the surge protector in the TN-S system is a system with a protective neutral line, that is, the protective neutral line is completely separated from the working neutral line, which is suitable for places with greater danger or higher safety requirements.

The IT system is not directly connected to the earth, and the exposed conductive parts of the electrical device are connected to the grounding electrode through the protective grounding wire.

Therefore, the wiring of the surge protector should first find the installation position of the surge protector according to different grounding systems, and then connect the line according to the different ports of the surge protector. Of course, according to different surge protectors, a matching backup protector should be connected in series in front.