Explosion-proof flexible hose and flange
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I have purchased a new explosion-proof junction box that comes equipped with M20*1.5 explosion-proof flange connectors. I plan to place the cable tray below or near the box, and then connect the cables to the box using those explosion-proof flange connectors. I wonder if this approach is appropriate? The cable is not armored; it is flame-retardant. The previous approach was to remove the original M20*1.5 gland heads, replace them with explosion-proof flexible pipes, and then convey them to the distant cable trays through galvanized protective steel pipes. I would appreciate some guidance from those who are more experienced – are there any standards to follow? There are similar doubts regarding the field instruments as well.
The image is similar to this one; does the connector provided with the box require the thick explosion-proof flexible pipe to be removed before connection, or can it be connected directly to the cable?
For explosion protection, it’s better to use flexible pipes
It can be connected directly via cable, with an explosion-proof rubber ring inside the flange
If installed indoors, it is possible； If installed outdoors, it is best to use a protective tube to prevent the cable from aging.
The gland is used to directly connect the cable; pay attention to armored and unarmored cables, corresponding to armored and unarmored cable types
Both methods can meet the requirements; see **Standard Atlas 12D401-3: Installation of Electrical Circuits and Equipment in Explosive Atmospheres**
Installation indoors is no problem, but protection is needed outdoors!
Either one is fine. It should be noted that in environments that are not particularly favorable, it is recommended to use protective tubes for installation; this helps prevent corrosion and mechanical damage, and also contributes to a neat and attractive appearance.