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What are the methods for calculating the outer sheath of mineral-insulated fire-resistant cables?

Mineral-insulated fire-resistant cables use heat-resistant, non-combustible inorganic minerals as the insulation material. The outer sheath of mineral-insulated cables boasts excellent tensile strength, allowing it to withstand pulling forces while also enabling passage through structural layers. So, what are the methods for calculating the specifications of the outer sheath in mineral-insulated fire-resistant cables?

2022-08-19

What are the main construction methods for mineral-insulated fire-resistant cables?

Mineral-insulated fire-resistant cables, known for their high-temperature resistance, flame retardancy, and fire protection capabilities, are widely used in the power supply lines of critical fire-fighting equipment because they can maintain power even during a fire. During the engineering installation process, certain experiences and shortcomings have been identified. This case aims to summarize the insights and challenges encountered during installation—so, what are the primary construction methods for mineral-insulated fire-resistant cables?

2022-08-16

Instructions for Use and Features of Accessories for Mineral-Insulated Fireproof Cables

Mineral-insulated cables, often referred to as MI cables—or, according to domestic practice, magnesium oxide cables or fire-resistant cables—are electrical cables featuring copper conductors, exceptional insulation properties provided by magnesium oxide mineral powder, and a copper sheath for added protection. So, what are the usage instructions and key features of the accessories for mineral-insulated fire-resistant cables?

2022-08-09

What are the precautions for mineral-insulated fire-resistant cables?

When laying mineral-insulated fire-resistant cables, in addition to support-based installation and securing at the supports, the spacing between fixing points on exposed sections can be determined according to the recommended values listed in the table. If cables of different sizes—large, medium, and small—are arranged in the same direction, for aesthetic and neatness purposes, they may be fixed either following the standards for small-sized cables or adhering to the standard fixing intervals. When cables are installed at an incline, if the angle between the cable and the vertical direction is 30 degrees or less, they should be secured at the vertical spacing; however, if the angle exceeds 30 degrees, horizontal spacing should be used instead.

2022-08-01

What factors can affect mineral-insulated fire-resistant cables?

In the production process of mineral-insulated fire-resistant cables, numerous factors can affect the insulation resistance of these cables, potentially leading to a reduction in their overall insulation performance. Among them, four key factors have the most significant impact on mineral-insulated fire-resistant cables.

2022-07-26

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