T/HSXLXH 001-2021 THSXLXH 001—2021 rated voltage 750V Mineral Insulated Fire-resistant Cable Group Standard

Scope

Main technical content: 5 Technical requirements 5.1 Conductors The conductors shall be compliant with the requirements of GB/T 3956-2008 for Type 1 unplated metallic round annealed copper conductors and have an approximately circular cross-section. 5.2 Insulation 5.2.1 Insulation composition The insulation shall consist of a densely compacted powdered mineral compact, and its electrical performance shall ensure that the finished cable meets the requirements of this document. 5.2.2 Insulation thickness The nominal insulation thickness between conductors and between each conductor and the metal sheath shall be as specified in Table 1. When measured according to 6.3.3, the minimum measured insulation thickness shall not be less than 80% of the specified nominal value plus 0.1 mm. Table 1: Insulation, metal sheath dimensions and thickness, and outer sheath thickness for 750V cables **Number of conductors and nominal cross-sectional area (mm2)** **Nominal insulation thickness (mm)** **Nominal metal sheath thickness (mm)** **Metal sheath outer diameter (mm)** **Nominal outer sheath thickness (mm)** 3×4 + 1×2.5 1.3 0.50 11.20 0.75 3×6 + 1×4 1.3 0.55 14.90 0.75 3×10 + 1×6 1.3 0.60 17.40 0.00 3×25 + 1×16 1.3 0.75 22.20 0.25 3×35 + 1×16 1.3 0.75 26.0 0.25 4×35 1.3 0.75 22.20 0.25 4×4 + 1×2.5 1.3 0.50 13.20 0.75 4×6 + 1×4 1.3 0.55 14.90 0.75 4×10 + 1×6 1.3 0.60 17.40 0.00 4×16 + 1×10 1.3 0.70 20.50 0.25 4×25 + 1×16 1.3 0.75 23.70 0.25 5.3 Metal sheath 5.3.1 Material The sheath shall be made of ordinary annealed copper or copper alloy materials. 5.3.2 Metal sheath thickness The average thickness of the metal sheath shall not be less than the nominal thickness specified in Table 1. However, the thickness at any point may be less than the nominal value, provided that the difference between the actual and nominal values does not excee

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