Explosion-proof cable gland is an explosion-proof accessory used on cables with high requirements. It can be installed at the connection between explosion-proof cable ports and explosion-proof electrical equipment to introduce cables and fix positions to achieve sealing and explosion-proof effects. It has the advantages of excellent explosion-proof performance, safe and reliable structure, simple and convenient installation, and high protection level. It is widely used in various places that require electrical safety and explosion-proof, such as petroleum and chemical industries, and is especially suitable for places that require electrical explosion-proof on offshore platforms and ships.
What is the difference between explosion-proof cable glands and ordinary cable glands?
It is not difficult to distinguish the difference between the two. First: Explosion-proof cable glands are made of metal, generally stainless steel, carbon steel, or brass. Ordinary cable glands are made of plastic. Second: Explosion-proof cable glands have explosion-proof certificates, test reports, 3C reports, explosion-proof functions, and are more professional and rigorous. Ordinary cable glands do not have these certificates. Third: Ordinary cable glands are cheap, while explosion-proof cable glands are expensive and expensive. Fourth: The industries in which they are used are also different. Ordinary cable glands are suitable for ordinary distribution boxes, distribution cabinets, control boxes, distribution boards, and lamps and wires and cables. They effectively clamp the cables and play a waterproof and sealing role. Explosion-proof cable glands are suitable for explosion-proof distribution boxes, explosion-proof instrument boxes and other explosion-proof equipment. Most of them are used in chemical companies. The most important thing is to play an explosion-proof, isolation and sealing role. Now that we have discussed the four most important differences between the two, let's talk about their common function, which is to seal and clamp. Ordinary cable glands are waterproof and dustproof. In addition to the advantages of waterproof and dustproof, explosion-proof cable glands are also explosion-proof and corrosion-resistant, and are generally used in explosion-proof equipment. Therefore, to see whether it is an explosion-proof cable gland, first look at whether it is made of metal. The second most obvious and direct way is to see whether there is an "Ex" mark on the component. Regardless of the type of cable gland, in special industries, places that are flammable, explosive, and prone to environmental corrosion require the use of high-end and high-quality cable glands, such as 304 and 316 stainless steel explosion-proof cable glands.
Instructions on the use of explosion-proof flexible connection pipes and cable glands
Explosion-proof flexible pipes are designed for explosion-proof instruments. Many functions are redundant and troublesome for intrinsically safe instruments and occasions that do not require explosion-proof. Cable glands are also called cable fixing heads. They are installed at the connection between cables and electrical equipment to introduce cables, fix positions, seal, and prevent explosions. Generally speaking, it is enough to fix, waterproof, seal, and flame retardant intrinsically safe instruments. Engineering plastics can meet the requirements; the cable glands of explosion-proof instruments sometimes need to form pressure relief channels and absorb energy. Cable glands with these functions are usually made of metal. After the instrument wire is led out from the cable gland, leave a length of less than one meter in the space, and then pass through the pipe or into the junction trough. It is best to fix the pipe opening and the junction trough inlet with a cable gland (other measures are also acceptable). Signal wires other than current, resistance, and switching quantity, if they are not shielded wires, it is best not to use cable glands (it is best to use shielded wires), and cable glands should be used with caution for compensation wires. If armored cables are used, only armored cable glands are needed, and flexible tubes are not needed. The armored cables also pass through armored cable glands when entering the junction box. If non-armored cables are used, cable glands + flexible tubes are used. The flexible tubes are connected to tees (for drainage), and the tees are connected to the threading tubes. The threading tubes are connected to the cable glands of the junction box through the flexible tubes. The incoming wires of the junction box are at the bottom of the box, so there is generally no need to add tees for drainage. The cable gland is a cable entry device. For explosion-proof instruments, the purpose is to cooperate with the instrument itself to play an explosion-proof role. There is no explosion-proof requirement at the threading tube. Using cable glands for waterproofing is a bit of a waste of resources. Gland is a common cable entry device internationally. There are still other forms of cable clamping joints in China. For example, Nanyang Explosion-proof Motor Factory has always insisted on using their outlet buckets, which are divided into two types: bell mouth and threaded mouth. For electrical, they sometimes do not use glands, but use threaded mouth + sealing rubber rings. The above two methods are in line with national explosion-proof regulations.
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