Do intrinsically safe cables only require waterproof flexible tubes?

Intrinsically safe cables are cables used in intrinsically safe circuits. When selecting this kind of cable, you need to consider the capacitance and inductance of the entire loop, as well as the length of the cable. I'm also getting into this area. It is recommended that the required knowledge can be obtained from GB3836.4.

We have always chosen waterproof types in previous projects.

Explosion-proof measures must be taken when laying cables in explosion-proof areas: 1. For ordinary unarmored cables, explosion-proof flexible pipes and explosion-proof Y-shaped joints should be used when connecting to instruments or junction boxes. ； 2. When connecting armored cables to instruments or junction boxes, explosion-proof golan is generally added to the instrument or junction box body without adding flexible tubes.

Explosion-proof is necessary, and intrinsic safety is a type of explosion-proof. Usually when intrinsically safe instruments are used, armored intrinsically safe cables are used instead of explosion-proof flexible pipes. Armored cables and explosion-proof cable sealing joints are used to connect to the instrument equipment. This can effectively prevent rainwater from entering the instrument from the flexible pipes. This situation is especially likely to occur after the flexible pipes age after a few years. At this time, the advantages of using armored cables and explosion-proof cable sealing joints can be reflected.

Waterproof flexible pipes are enough, but the two prices are about the same. You can consider explosion-proof ones.

In explosion-proof areas, do intrinsically safe cables only need waterproof flexible tubes, but not explosion-proof flexible tubes? What kind of flexible tube is used or whether it is used or not has nothing to do with whether the cable is intrinsically safe. In explosion-proof areas, the main consideration is the sealing of the meter head connection port. The on-site wiring part does not need to be sealed. so: 1. For armored cables, flexible tubes are not needed, but glands must be used. ； 2. Non-armored cables should use protective tubes or flexible tubes. If a gland is used, explosion-proof flexible tubes are not required. Otherwise, explosion-proof flexible tubes are required to ensure the sealing of the cable inlet.

What we do is only different in the instrument connector, but the rest are the same.

Reply 8# lmsa613 The instrument connectors are different. Can you describe it in detail or have pictures?

For example, the electrical interface of the instrument is 1/2"NPT: ordinary: Take-over waterproof sealing joint (1/2"NPT(MF))----Waterproof, dustproof and anti-corrosion flexible pipe (1/2"NPT(M)---G3/4"(F)x700)----Galvanized water and gas pipe (3/4")-----Dust-proof three-way wiring box (3/4", if the steel pipe is not laid upward, the three-way wiring box should be cancelled). Intrinsically safe: Take-over type explosion-proof sealing joint (1/2"NPT(MF))----Waterproof, dustproof and anti-corrosion flexible pipe (1/2"NPT(M)-G3/4"(F)x700)----Galvanized water and gas pipe (3/4")-----Dust-proof three-way wiring box (3/4", if the steel pipe is not laid upward, the three-way wiring box should be cancelled). The instrument interface is G1/2: Take-over type explosion-proof sealing joint (G1/2"-1/2NPT(F))----Waterproof, dustproof and anti-corrosion flexible pipe (1/2"NPT(M)-G3/4"(F)x700)----Galvanized water and gas pipe (3/4")-----Dust-proof three-way wiring box (3/4", if the steel pipe is not laid upward, the three-way wiring box should be cancelled).

The chemical industry recommends the use of corrosion-resistant shielded cables.