Is it okay to use an electrical interface with an explosion-proof converter before connecting to Gran?
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Typically, explosion-proof equipment is equipped with electrical interfaces for cable connectors to connect it to cables. When the size of the device connection port does not match that of the cable connector, can a conversion adapter be used for conversion before making the connection? For example, the device is equipped with 2 1”NPTF ports (one in use and one as a backup), and the cable has only two conductors. Since the cable is too thin, the 1”NPT fitting cannot clamp it tightly. Is it possible to first use an explosion-proof conversion fitting of type 1”NPTM-1/2”NPTF, and then connect it using a 1/2”NPTM fitting? It seems that this approach is commonly used in the field. I would like to ask: if this can be done, what principle or standard does it follow? Thank you; GB 3836.1-2010, Explosive atmospheres – Part 1: Equipment – General requirements, sets requirements for cable connection devices, but does not provide any specifications regarding adapters.
Please ask an expert to answer. . . I think it’s acceptable, because if the interface really becomes too large, the cable will indeed be very thin, falling below the minimum diameter allowed by Glan’s manufacturers; I don’t see any problem with handling it in this way. But usually, such a situation doesn’t occur. . . The disadvantages of using Gran become apparent in such cases; that’s why sometimes we opt for explosion-proof junction boxes filled with sealing putty, which eliminates any issue related to mismatched sight paths. Hehe
Thank you. It’s already available on site. As you mentioned, I’m not sure how to fix it using junction boxes and mortar; I don’t understand the actual installation process.
Transmitter (inner) – Explosion-proof union (outer/outer) – Y-type sealing joint (inner/inner) – Flexible hose (outer/inner) – Protection tube (inner). This is the way I carried out one of the projects I’ve worked on. A Y-type sealing joint is also known as an explosion-proof sealing box; it contains explosion-proof sealing putty. In other words, regardless of the inner diameter of the connector and the outer diameter of the cable, as long as there is space, the putty is used to fill that space. This is a common practice that completely prevents situations like the one you described from occurring. Clay is the kind that breaks as soon as you poke it with chopsticks, but it is actually fire and explosion resistant, and it can also be used to secure cables. In your case, what you said is sufficient; it’s just the best option available