Zone 2 explosion hazard, issue with instrument wire diameter
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According to GB50058, Table 5.4.1-2 specifies that a wire thickness of at least 1.5 is required for Zone 2. However, per HG 20512, a thickness of 1.0–1.5 is acceptable for Zone 2. It is not clear whether 1.0 can be used for analog signals and digital signals in instrument control circuits; the distance is 350 meters. I seek expert advice on this matter. Thank you
Anyway, the resistance is 6-7 ohms; I don’t know anything about the other values. The longest length I’ve used is 100 meters
Theoretically, 1.0 is sufficient for 350 meters, but in practice it’s better to use 1.5 – there’s no need to save that little money.
What I mean is that GB specifies a minimum of 1.5 for voltages below 1000V, while the specification for HG signal lines is different
What is the relationship between explosion protection and wire diameter?
There are requirements regarding the wire diameter in explosive hazard areas; take a look at the pictures I sent
I want to ask what the relationship is between explosion protection and wire diameter.