Regarding the threaded connections of instruments and electrical interfaces for commonly used armored cables, what are the common interface types? Common standards include....
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This post was last edited by 328104062 on 2016-1-3 at 19:46. Armored cables are used for both field instruments and electrical systems; these cables have three layers – a steel wire armor layer, a shielding layer, and a moisture-proof layer – and no conduit is used (conduits were used in the past). 1. What are the common types of armored cables? 2. What are the standards for commonly used connections such as G3/4“, G1“, G2“? What standards are NPT1" and NPT2"? 3. What are the common interface types? 4. How should the various standards be compared? ? ? Manager Discussion Group
The standard specifications are m20*1.5, NPT1/2, etc.; for special specifications, a conversion fitting is required
Threaded connections for commonly used armored cable instruments and electrical interfaces
This post was last edited by 328104062 on 2016-1-3 at 19:46. Armored cables are used for both field instruments and electrical systems; these cables have three layers – a steel wire armor layer, a shielding layer, and a moisture-proof layer – and no conduit is used (conduits were used in the past). 1. What are the common types of armored cables? 22 denotes steel belt armor, and 32 denotes steel wire armor. The characters at the front represent the type of shield, while the letters at the back indicate the type of jacket. 2. What are the standards for common connections such as G3/4“, G1“, G2“? . What standards are NPT1" and NPT2"? G refers to British standard straight-thread threads, while NPT denotes American standard tapered threads; the thread pitch angle is also different – 55° for British standards and 60° for American standards. In on-site construction, threading machines are generally used for tapered threads. The NPT is tapered and self-sealing. 3. What are the common interface types? The common thread sizes are G, M, and NPT; these correspond to M20X1.5, G1/2, G3/4, and G1 respectively. 4. How should the various standards be compared? ? ?
This post was last edited by jujiangliu on 2016-1-4 07:40. G is a domestic standard–pipe thread； NPT is the American tapered pipe thread.
The field instruments and electrical components all use armored cables with three layers (steel wire armor, shielding layer, and moisture-proof layer); no sleeve type is used (sleeves were used in the past). In accordance with the sealing principle of cable glands, the outer sheath layer, the armor layer, and the inner sheath layer of the cable all have sealing rings/bands to achieve a tight seal. The dimensions of these elements must be within the specified range; otherwise, the cable cannot be secured tightly. 1. What are the common types of armored cables? Meters are generally armored with steel wire, while electrical components are commonly armored with steel strips. Some CableGlan products are differentiated by \"steel strip\" and \"steel wire\" armor, and they are not interchangeable. 2. What are the standards for commonly used connections such as G3/4“, G1“, G2“? What standards are NPT1" and NPT2"? The friends upstairs have already answered. 3. What are the common interface types? Flat threads for M and G, tapered threads for NPT. According to IEC explosion-proof certification, flat threads are supplied as standard, while NPT is an option. Flat threads can accommodate waterproof washers, while tapered threads cannot. 4. How should the various standards be compared? ? ? It is only a matter of size correspondence; the threads cannot be interchanged. @jiaguoyun
In the petrochemical industry, NPT is generally used for instruments, while G is commonly used for instrument protection tubes; in both cases, explosion-proof sealed connectors are required. Other industries are more casual.