1、 Definition of Explosion proof and Anti corrosion Low voltage Electrical Appliances
Explosion proof and anti-corrosion low-voltage electrical appliances refer to electrical appliances used in indoor and outdoor explosive hazardous areas with explosive gas mixtures and corrosive media.
2、 Explosion proof and anti-corrosion low-voltage electrical appliances are divided into the following five types according to their protection types:
(1) Indoor explosion-proof and moderately corrosion-resistant type
(2) Indoor explosion-proof and anti-corrosion type
(3) Outdoor explosion-proof and anti-corrosion type
(4) Outdoor explosion-proof and moderate corrosion resistant type
(5) Outdoor explosion-proof and anti-corrosion type
3、 Technical requirements for explosion-proof and anti-corrosion low-voltage electrical appliances
(1) Normal operation must be carried out under the climatic and biological conditions listed in Table 1, as well as the chemical and mechanical active substance environmental conditions listed in Table 2.
(2) Has anti-corrosion properties
a 、 The insulation resistance between the shell of the electrical appliance and the conductive parts, as well as between the conductive parts that are mutually insulated, shall not be less than 2M Ω
b、 The dielectric performance of electrical appliances should comply with the relevant provisions of GB/T 14048.1-1993
c、 The operation and performance of electrical appliances should be flexible and reliable, in accordance with the product standards,
d、 The conductive parts, magnetic parts, metal structural parts inside the shell, and fasteners on the shell shall not show obvious corrosion phenomena, such as copper green, rust, etc. (except for the pole surface of the iron core)
e、 The paint layer on the surface of the shell shall not be soft or visibly wrinkled, and there shall be no bubbles with a diameter greater than 1mm commonly present. The maximum diameter of individual large bubbles on castings shall not exceed 10mm, and on steel plate components shall not exceed 5mm. There shall be no corrosion of the base metal (except for welding joints, casting surface particles, sharp corners, and mechanical damage)
f、 The plastic shell and plastic parts on the shell shall not bubble, deform, or crack
g、 Rubber parts shall not corrode, delaminate, brittle crack, deform, or become sticky. The hardness change value of sealing rings and gaskets shall not exceed 20% before the test.
h、 The nameplate shall not corrode, lift or fall off, and the handwriting on the nameplate shall be kept clear
i、 The explosion-proof surface of explosion-proof electrical appliances shall not corrode
j、 The conductive parts and fasteners inside the junction box shall not have obvious corrosion points.
(3) Has explosion-proof performance
After undergoing corrosion testing, the explosion-proof performance of electrical appliances must comply with the relevant requirements of GB3836
(4) Shell protection performance
The protective performance of the casing of electrical appliances should not be lower than the requirements of IP54
(5) Fasteners on the shell
All steel fasteners (bolts, screws, washers, etc.) on the electrical casing should undergo galvanizing passivation or other anti-corrosion treatment on their surfaces. For highly corrosive electrical appliances, after assembly, fasteners that leak out of the casing should be sealed with nitrile or chloroprene rubber sealant.
(6) Grounding bolt
The grounding bolts of electrical appliances should be made of stainless metal materials or undergo reliable anti-corrosion treatment
(7) Painting on the surface of the shell
The coating on the surface of electrical enclosures should comply with the requirements of JB 2420. The outer surface of outdoor explosion-proof and anti-corrosion low-voltage electrical appliances should be coated with light colored paint (gray, silver gray, light gray, and white).
(8) Anti corrosion treatment of explosion-proof surface
The explosion-proof surface of the metal material of explosion-proof electrical appliances should be treated with anti-corrosion, and it is allowed to apply anti rust grease that can prevent corrosion and maintain explosion-proof performance.
(9) Temperature rise of outdoor explosion-proof and anti-corrosion low-voltage electrical appliances
When designing outdoor explosion-proof and anti-corrosion low-voltage electrical appliances, the impact of sunlight exposure on temperature rise should be considered. The temperature rise design can be based on a maximum ambient temperature of 40 ° C, but a certain margin must be left to offset the impact of sunlight exposure. The values of temperature rise margin are shown in Table 3.
(10) Low temperature performance of outdoor explosion-proof and anti-corrosion low-voltage electrical appliances
When the operating environment temperature of outdoor explosion-proof and anti-corrosion low-voltage electrical appliances is below -20 ° C, the impact of low temperature environment on electrical performance should be considered. Outdoor explosion-proof and anti-corrosion low-voltage electrical appliances should be designed with shell materials, electrical components, connecting wires, structural components, oil, etc. that have good low-temperature resistance to ensure reliable electrical performance and explosion-proof safety under low-temperature conditions.
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