Does the junction box need to have flange fittings?

A cable gland is a device used to secure and seal cables as they enter a device; it protects the interface between the cable and the junction box, prevents dust and dirt from entering, and provides tension relief and grounding functions. It is indispensable in electrical installations in many situations. As for whether the junction box you mentioned needs gland fittings, this usually depends on the following factors: 1. **Installation environment**: If the junction box is installed in an environment where dust or moisture may penetrate, it is necessary to use gland fittings with good sealing properties. 2. **Cable type**: Certain types of cables, such as shielded cables, may require special types of gland fittings to ensure electrical connectivity and the integrity of the shielding. 3. **Safety standards or requirements**: Different applications and fields may have varying safety standards, which may specify the selection and installation of gland fittings. 4. **Acceptance Criteria**: The electrical engineering acceptance criteria for certain specific projects or areas may have specific requirements regarding the use of gland fittings. Regarding what you heard about it being difficult to pass the inspection with a Gran head, this may be due to certain specific inspection standards or the actual installation conditions on site. For example, in some applications, if the installation of the gland does not meet the requirements (such as mismatched models or sizes, improper installation, etc.), or if the material and protection rating of the gland do not satisfy the demands of a particular environment, it can lead to problems during acceptance. Therefore, it is recommended that you consult the local electrical installation and acceptance standards to understand the specific requirements. If there are drawings or design specifications, the corresponding gland should also be selected in accordance with the relevant instructions. Before making the actual purchase and installation, it is best to consult a professional electrical engineer or the local authority responsible for inspections to ensure that all required specifications are met. .

This post was last edited by qugd on 2023-12-5 at 14:43. Whether to include a gland, and what specification of gland to use, are determined through negotiation between the supplier and the buyer prior to the business purchase; this depends on the outcome of their communication. During acceptance, the technical agreement and commercial contract signed prior to supply can be used as evidence.

While others were saying that the completion inspection wouldn’t be passed easily, I couldn’t find any regulatory provisions or documents stating that junction boxes cannot have gland fittings.

Bro, if there are still so many unused GRAN heads that haven’t been connected by the time of completion, how is it possible to let you pass? For those without wiring, remove the gland and seal the junction box with a plug.

The last empty space must definitely be sealed with a plug. The key point is that the cable enters the junction box through a gland; some people say that this approach might not pass inspection, but I couldn’t find any source for this claim.

It’s not possible to specify in the regulations that gland fittings must not be used in junction boxes, but it will be stated that the spare wiring holes in junction boxes should be sealed with plugs.

Do you mean that the cables in the explosion-proof area are connected directly with gland connectors, without explosion-proof flexible tubes? Nothing else seems noticeable either

Is the concept not clear? Instead of a flexible tube, an explosion-proof flange should be used; even if a flexible tube is used, an explosion-proof flange is still necessary, although the specifications of the two types of flanges are different. In more formal terms, it is called an explosion-proof sealing joint. I guess you mean that it’s not easy to pass without flexible explosion-proof pipes? Proper wiring in accordance with the specifications will definitely be fine, but the acceptance process may involve other factors such as local practices or internal standards.

In our field (chemical engineering), we need to use wire ducts and explosion-proof hoses; for empty spaces, plugs are required, otherwise it’s not safe and approval won’t be granted

Our original design was to use steel pipes + flexible pipes + flanges + connectors on the junction box itself. We heard that it’s difficult to pass the inspection when flanges are used, so we were required to connect the steel pipes and flexible pipes directly to the connectors on the junction box. Regarding this practice of avoiding gran heads, no standards or sources for relevant documents have been found.