There are two national standards, one is the standard of GB2379-93 industrial electric heating tubes, and the other is 4088-99, the standard of civil heating tubes.
Electric heating tube is a tubular electric heating element, which is composed of metal tube, spiral resistance wire and crystalline magnesium oxide powder. Electric heating tube products are generally made of high-quality imported stainless steel tubes, imported high-temperature magnesium oxide powder, high-quality heating wires and other materials to make heating elements, and other structural parts are made of stainless steel, which have excellent overall performance, as well as ultra-long life and easy maintenance.
In the stainless steel seamless tube evenly distributed high temperature resistance wire, in the gap part filled with good thermal conductivity and insulation performance of crystalline magnesium oxide powder, the structure is not only advanced, high thermal efficiency, uniform heating, high temperature resistance wire current through, the heat generated through the magnesium oxide powder to the surface of the metal tube, and then transmitted to the heated part or air to achieve the purpose of heating.
In a 380-volt three-phase four-wire circuit, the voltage between any two live wires is 380 volts, and 220 volts can be formed between any live wire and the neutral wire. This system can form three power supplies: single-phase 220-volt power supply, single-phase 380-volt power supply, three-phase 380-volt power supply, the first type of household is more, the third type of factory in the motor class is used more, the second is used less, only AC welding machines often use single-phase 380 volt power supply.
