The primary line length of the welding machine should not exceed a few meters

I. Regulations on the lengths of the primary and secondary lines of the electric welding machine

During the operation of an electric welding machine, there are strict regulations on the lengths of the primary and secondary wires. According to the "Safety Technical Code for Temporary Electricity Use at Construction Sites" (JGJ 46-2005), the length of the power line on the primary side of the electric welding machine shall not exceed 5 meters, while the length of the power line (welding cable) on the secondary side shall not exceed 30 meters. These regulations are based on comprehensive considerations of safety and efficiency.

If the primary line is too long, it may cause a voltage drop, increasing the risk of line damage. At the same time, it may also cause safety hazards due to overheating. Therefore, limiting its length to within 5 meters can ensure a stable power input and reduce safety risks. If the secondary line serves as the output line and is too long, it will lead to a decrease in the welding current, thereby affecting the welding quality. In addition, overly long secondary lines also increase the risk during movement, so their length is limited to within 30 meters.

Ii. The Differences between the primary and secondary wiring of an electric welding machine

1. Functional differences: The primary line of an electric welding machine mainly undertakes the tasks of power transmission and transformation. It transmits the input power to the transformer of the electric welding machine and provides power for the transformer. The secondary line is responsible for transmitting the electrical energy output by the transformer of the electric welding machine to the welding electrode and the welding workpiece, forming an arc and completing the melting of the metal material.

2. Current and voltage characteristics: The primary line features high voltage and low current, mainly serving the function of power input. The secondary line is of low voltage and high current, responsible for the actual execution of the welding task.

3. Safety considerations: Due to the differences in current and voltage characteristics between primary and secondary lines, the safety precautions during their use also vary. The primary line requires special attention to prevent voltage drop and overheating issues, while the secondary line needs to focus on the stability of the welding current and the integrity of the circuit to prevent the welding quality from being affected or safety accidents from occurring.

To sum up, there are significant differences between the primary and secondary lines of an electric welding machine in terms of length, function, as well as safety and efficiency in use. Understanding and following these regulations and differences is the key to ensuring the safe and efficient conduct of welding operations.