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Precautions for the installation and use of electric heating cables in explosive gas environments

Published on:

2023-02-27 11:21

As an effective measure of pipeline insulation and anti-freeze protection, electric heating cable is widely used in many fields, such as electric power, steel, oil, chemical industry, fire protection, etc. D. It has become a key national promotion due to its advantages of high thermal conductivity. Efficiency, energy saving and environmental protection, simple design and convenient installation. In the mass production and use of electric heating cables, it is especially important to pay attention to the installation and use of electric heating cables in explosive gas environments.

The electric heating system is mainly composed of power supply, electric heating cable, temperature controller, junction box, back and other components. The electric heating cable and the necessary components must first meet the requirements of GB 3836.1-2010. When the junction box, tail and other components are used as independent components, they must meet the requirements of one or more explosion-proof types. Are listed in the GB 3836.1-2010 standard. Electric heating cables are the main heating equipment Special standards for electric heating cables used in explosive environments include: "GB/T 19518.1-2017 Resistive heaters for explosive environments, Part 1: General requirements and test requirements", "GB/T 19518.2-2017. Resistance electric satellites for explosive environments, part 2: Design, installation and maintenance manual.

Differences in System Equipment Implementation

The electric heating system usually consists of a junction box, a distribution cable, an electric heating cable and its accessories. Accessories include: power junction box, intermediate junction box (double-sided or three-sided), terminal junction box, etc. D. The basic composition of the electric heating system is shown in the figure below.

The system features two forms:

1. Suitable for entering distribution cables. (The inner hole of the sealing ring is round)

2. Suitable for the electric heating cable input device. (The inner opening of the sealing ring is in the form of a flattened rod suitable for an electric heating cable)

In engineering practice, the component systems must be properly selected and properly installed according to the requirements of the equipment operating instructions. It is strictly forbidden to inject and deduct the distribution cable through an input device suitable for an electric heating cable, or to inject and deduct the electric heating cable through an input device suitable for the distribution cable.

Grounding

1 The metal shielding layer of the electric heating cable shall be securely connected to the protective ground (PE) line of the power supply in the power supply distribution box.

2. The metal shielding layer between the electric heating cables shall be securely connected in the intermediate junction box (two-way or three-way).

3. In the distribution box, the bare wire of the heating cable and the grounding metal shielding layer should be further insulated to prevent leakage or short circuit.

4. The metal shielding layer of the electric heating cable with the outer shielding layer shall be securely connected to the outer grounding connector of the junction box, and the outer grounding shall be securely connected to the grounding system in the explosive area, and the grounding resistance shall not exceed 4 ohms.

qualification

Electric heating cables and their system fittings used in explosive environments must have explosion protection certificates and mandatory product certification (CCC certification, etc.).

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