Easy 3m 300A earth cable

Electrolytic copper with a cross section of 25 mm2 in the EASY series over a distance of 3 metres is an engineering choice made for the sake of handling. At a current of 300A the current density along this run is set so that energy transfer stays efficient at a 20 percent duty cycle, which keeps the insulation from ageing too fast. This keeps the weight of the cable itself very low, which counts when the welder changes position often. Pure copper with fine stranding makes the cable barely stiff, so the equipment is easy to handle even in tight spaces. With this cross section the user can be sure that electrical energy reaches the weld pool with the efficiency standard workshop jobs require. It is a deliberate decision by SpawLab that supports hobby and professional inverters alike by lowering the resistance of the earth connections.

The EASY series was designed around a load profile that allows at most 2 minutes of continuous welding at 300A, after which an 8 minute break is needed. This pattern of work matches the tacking of structures, spot assembly and the short welds made in metalworking shops. Optimising the cycle allows a lighter cross section of 25 mm2, which lowers the purchase price while the cable still works at high amperage. Keeping to the recommended working time means the cable does not heat up too much through resistance, which protects the structure of the copper core. Heat is carried away through the chloroprene insulation, so the operator stays safe even at full load within the given cycle. Choosing the EASY series is a deliberate decision to match the capacity of the equipment to the real character of assembly work, where speed counts more than series production.

The H01N2-D insulating sheath made of chloroprene rubber gives a high degree of mechanical and chemical protection in a hard workshop environment. The material resists oils, greases and direct contact with hot welding spatter, which gives the cable a long life. The physical strength of chloroprene keeps the insulation from becoming brittle under UV radiation and ozone, which matters for protecting the electronics of the welder against accidental short circuits. The outer jacket stays flexible even at temperatures below zero, so assembly work in the field causes no cracking of the sheath. Thanks to its self-extinguishing properties, H01N2-D insulation raises the level of fire safety at the workplace and protects the copper core against overheating. It is an armour for the copper, built to take repeated dragging over the sharp edges of steel structures.

The cable of the EASY series comes with a solid earth clamp cast from highly conductive brass, which gives a firm electrical connection to the workpiece. Brass conducts heat far better than copper-plated steel, so there is no risk of burning the earth contact point during work at 300A. A strong spring with high clamping force keeps the mechanical contact steady, which is needed to avoid side sparking that damages the surface of the part and unsettles the arc. The cable is joined to the clamp through a thick-walled copper sleeve, so the copper strands cannot work loose and the flow of energy stays constant and without losses. A solid earth contact is the basis of safety for the IGBT circuit inside the machine and prevents failures caused by sudden jumps in resistance in the secondary circuit. Every part of the clamp resists corrosion, which keeps the contact resistance low through the whole service life of the equipment.