installation is an important part of ensuring the safe operation of explosion-proof electrical equipment. Before installation, you should pay attention to confirming whether the product mark is correct, whether the shell has cracks or damage, whether the explosion-proof surface is clean and not damaged, whether the electrical connection is firm or not, and whether the sealing shell material is free of cracks and other defects.
With the development of the industry, explosion-proof control cabinets and other explosion-proof electrical equipment have been applied on a larger scale. However, there are some misunderstandings when installing electrical equipment such as explosion-proof control cabinets. Let’s take a look at the common misunderstandings.
Misconception 1. Seal filler can replace sealing circle
In order to facilitate installation, some installation and construction personnel often directly discard the sealing ring at the entrance of explosion-proof electrical equipment and replace it with sealing filler. They believe this can also prevent external explosive gas from entering the equipment for explosion-proof effects.
In fact, if the sealing filler is directly used for the inlet of explosion-proof and explosion-proof electrical equipment, the explosion-proof of the product will be seriously ineffective. The isolation sealing effect can only be achieved when the sealing filler is used in conjunction with the corresponding isolation sealing box.
Zhongtong Intelligent Workshop Real Scene
Misunderstanding 2, Direct steel pipe inlet line compression sealing ring
Explosion-proof electrical equipment cable introduction device is an important part of maintaining the explosion-proof performance of explosion-proof electrical equipment. However, during the inspection, some installation and construction personnel in the steel pipe wiring system directly screwed into the inlet of the explosion-proof electrical equipment through the external thread of the steel pipe, pressed the rubber seal ring and believed that the sealing circle could be pressed. This is actually an extremely common mistake. The external thread of
steel pipe is made by on-site construction personnel through wire sleeves, and is mostly conical, which cannot ensure that it is effectively engaged with the internal thread of the inlet of explosion-proof electrical equipment, meeting the number of buckles requirements. Once a spark is generated inside the explosion-proof electrical equipment and an explosive gas that may enter the equipment through the explosion-proof joint surface will ignite, causing an explosion inside the equipment. The uncompressed rubber seal may not withstand the pressure generated during the explosion, causing the flame generated during the explosion to spread to the outside of the equipment, resulting in a larger-scale explosion, and the consequences will be unimaginable.
Therefore, in the steel pipe wiring system, while selecting a suitable single-hole or multi-porous rubber sealing ring, an explosion-proof compression transition joint can be installed between the steel pipe and the equipment inlet to play the role of compression sealing ring.
Zhongtong Intelligence, Zhiying Future
Misunderstanding 3, Can still be explosion-proof without replacing the shell html l4
During the installation and construction process, the construction personnel arbitrarily change the structure, parts and internal circuits of explosion-proof electrical equipment. For example, ordinary instruments are sealed with safety-enhancing junction boxes for explosion-proof hazardous places; explosion-proof explosion-proof junction boxes are arbitrarily transformed into explosion-proof electrical control box for use; due to insufficient inlet ports, holes are opened on the outer shell of the explosion-proof control box, etc. These construction workers mistakenly believe that as long as the shell is not replaced, it will not affect explosion-proof safety.
is actually the opposite. These incorrect installations have seriously damaged the original explosion-proof performance of explosion-proof electrical equipment. Explosion-proof electrical equipment cannot be customized at will. For explosion-proof electrical equipment, the size and volume shall not be changed at will according to the needs of use. The changed drawings and relevant instructions must be sent to the original inspection unit after partial changes, and can only be put into use after re-examination and inspection.
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