Heating pipes may have different wiring methods due to different equipment voltages. It is worth considering how to correctly wire heating pipes. In normal electric heating equipment, triangular and star wiring are commonly used, and then the heating tube is energized to heat the equipment. Common heating tube power supply voltages include 110V, 220V, and 380V AC voltages. In a 380V three-phase four wire power supply line, the voltage between any two live wires is 380V, and any one live wire and zero wire can form 220V. In this way, three different power supply methods can be provided for use on three different types of equipment:

1. Single phase 220V power supply; Commonly used on some small equipment, such as sealing machines, forming machines, etc;

2. Single phase 380V power supply; Commonly used on equipment such as injection molding machines and ovens;

3. Three phase 380V power supply; Commonly used in boiler heating and mold temperature machine heating equipment;

In heating pipes, flange type heating pipes are generally composed of multiple flanges, which can form single-phase 220V or 380V connection, three-phase 380V triangle connection, and three-phase 380V star connection through different connection methods. The main reason for this abnormal overheating damage is due to incorrect electrical installation and wiring methods. Unlike conventional electrical equipment and component circuit connectors (contacts), electrical connectors for electric heating components not only require correct and reliable wiring and low contact resistance, but also require certain heat dissipation characteristics and high resistance to oxidation and corrosion. The reason for the phenomenon of oxidation and corrosion is not only due to the severe corrosive gas and liquid effects (such as constant temperature water bath and salt bath) in the workplace of electric heating elements, but also due to high-temperature oxidation and corrosion, which is the most common direct cause of damage to electric heating element joints.