First of all, although there is no clear sense of the influence of the electric heating pipe and the working environment, after the case and the actual operation requirements, the influence of the air humidity in the environment on the electric heating pipe is still large, and it cannot be higher than 95%. There must be no flammable, explosive or corrosive gases.
The external working voltage of the electric heating tube should not exceed 1.1 times of the extra voltage. It is necessary to ensure that the outer casing is grounded before the electric heating tube is operated to prevent the occurrence of the incident.
In fact, the connection between the electric heating pipe and the ground wire is maintained.
At the top of the list, the grounding resistance of the maintenance ground is best at 4Ω (when the transformer capacity is not more than 100KV? A, it can be 10Ω)
Secondly, the grounding body can use a steel pipe with a wall thickness of not less than 3.5 mm, or a flat steel with a thickness of not less than 4 mm and a cross-sectional area of not less than 100 mm2. In the case of possible corrosive soil in the forefront, galvanized conductors and pipes should be used. Available copper tubes.
Third, the grounding lead-in line should use a multi-strand insulated copper wire with a cross-sectional area of less than 1.5mm2, and there should be no joint at the center.
Again, the equipment's three power supplies are not firm and rugged and cannot be greater than ±5%.
The electric heating tube needs to be placed stably, and no obvious shaking and shaking can occur; if the electric heating tube is heated in the liquid, it is necessary to know the pH of the liquid, and to work in the liquid with a more suitable electric heating tube.