GB 3836.10-1991 Explosion-proof electrical equipment for explosive environments. Gas-tight electrical equipment "h" GB3836.10-1991 Standard download and decompression password: www.bzxz.net

National Standard of the People's Republic of China
Explosion-proof electrical equipment for explosive atmospheres
Hermetically sealed electrical apparatus "h"
Electrical apparatus for explosive atmospheresHermetically sealed electrical apparatus "h1 Subject content and scope of application|| tt||GB3836.10-91
This standard specifies the technical requirements, tests and markings for the explosion-proof performance of air-tight electrical equipment and air-tight components. In addition to the provisions of the standard, it must also comply with the relevant provisions of GB3836.1 "General Requirements for Explosion-Proof Electrical Equipment for Explosive Environments". If GB3836.1 is inconsistent with the provisions of this standard, the provisions of this standard shall be followed
GB3836.1 General requirements for explosion-proof electrical equipment for explosive environments GB3836.3 Explosion-proof electrical equipment for explosive environments Increased safety electrical equipment e”3 terminology
3.1 Air-tight electrical equipment
Electrical Equipment.
3.2 Airtight enclosure
An enclosure that is sealed by melting, extruding or gluing. This kind of shell can prevent gas from outside the shell from entering the shell. 3.3 Airtight components www.bzxz.net
Electrical components with airtight enclosures that cannot be used alone in explosive environments. 4 Technical requirements
4.1 Shell
4.1.1 Each part of the airtight shell must be sealed by melting (such as soldering, brazing, welding), extrusion or gluing. Gasket sealing is not allowed.
4.1.2 The structure of the airtight enclosure should ensure that it remains airtight during the period of use. The shell that has passed the air tightness test must not be opened during use. If the shell is opened, the air tightness of the shell is considered to be damaged, and it must be resealed and the air tightness test must be done again. 4.1.3 If a flange connection is used for the metal shell, the flange must be welded or glued around, and the glue width must be no less than 6mm to ensure its airtightness.
4.1.4 The shell should minimize seams.
4.2 Cable entry device
Cables and leads passing through the shell wall must be sealed. The sealing performance should not be affected by temperature and climate, and measures should be taken to protect the cables and leads from mechanical damage. A typical structure is shown below. 1 in the figure must be no less than 20% of the electrical clearance value in Table 1 of GB3836.3, with a minimum of 2mm; the minimum thickness of the sealing filler is 2mm; the accumulation of air bubbles in the cured sealing filler must be prevented during pouring, State Bureau of Technical Supervision 1991-05 -27Approval1992-02-01implementation
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1 - connecting section 2 - metal pad diagram; 3 - screw; 4 - bare conductor, 5 - cable; 6 - sealing filler; 7 metal pad diagram; 8 - sealing ring; 9-Metal gasket; 10-Compression nut 4.3 The manufacturer must provide technical documents related to explosion-proof performance, such as sealing technology, etc. If an adhesive is used, relevant technical information such as its ultimate thermal stability temperature must also be provided; if possible, the solvent used to dissolve the adhesive must also be stated. 5 Test
5.1 Air tightness test
Air-tight electrical equipment or air-tight components must be air-tightly tested according to one of the following methods. 5.1.1 Immerse all samples in water. The top of the sample is located at least 1m below the water surface, and then the pressure above the water surface is reduced to 0.2×105Pa (absolute value) for 200s. The sample is qualified if there are no visible bubbles. 5.1.2 Quickly immerse the sample with an initial temperature of 25±2°C into water of 50±2°C. The top of the sample shall be at least 25mm below the water surface for 60 seconds. If there are no visible bubbles, the sample is qualified. 5.2 If adhesive is used for airtight electrical equipment or airtight components during sealing, the thermal stability test must be performed according to Article 24.2 of GB3836.1 first, and then the airtightness test must be performed. 6 Inspection procedures
6.1 The inspection procedures for airtight electrical equipment or airtight components manufactured in accordance with this standard must comply with the provisions of Chapter 31 of GB3836.1. 6.2 In addition to the relevant provisions of Chapter 4 of GB3836.1, the type test of airtight electrical equipment and airtight components must also be conducted in accordance with the provisions of Articles 5.1 and 5.2 of this standard. 6.3 Factory inspection
Each product shall undergo an air tightness test in accordance with Article 5.1. The manufacturer should ensure that each product has passed the performance inspection. 7 mark
The mark of airtight electrical equipment or airtight components complies with the provisions of Chapter 30 of GB3936.1, and the mark of its explosion-proof type is "h". Examples of signs: "hI", \hIT3". The standard is produced by Zhang Ping, the main drafter of this standard, Jia Shusi of the Ministry of Machinery and Electronics Industry
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