Jul. 26, 2019
Insulated Mineral Sheathed Cable Manufacturer to explain the construction points of mineral cables.
1. The joint is susceptible to moisture. The insulation layer of the cable is composed of mineral magnesium oxide. In the cable head construction, when the cable ends are peeled off and the conductor is exposed, it is easy to chemically react with the moisture in the air to form conductive magnesium hydroxide. The insulation resistance of Mineral Insulated Cable is generally above 100MΩ, but if the cable head is manufactured within 1h, the insulation resistance can be reduced to below 10MΩ, and even below 0.5MΩ. The use of such cables in engineering will inevitably lead to electrical hazards.
2. The cable circuit should be marked with the number. At the end of each circuit, the starting point, the intermediate joint, etc., respectively indicate the circuit number and phase sequence. In order to avoid too many phase sequence loops caused errors.
3. Mineral Insulated Fireproof Cable is mostly composed of single-core cable in the project, so it is easy to generate eddy current in the cable fixing fitting. If the eddy current is too large, not only will it cause a lot of loss, but also the aging speed of the fixed fixture of the cable will be accelerated, so in the actual construction, eddy current should be avoided or the eddy current should be minimized. Therefore, in the field, the cable fixing fixture usually needs to prevent eddy current measures, and the reasonable cable phase sequence is arranged to minimize the vortex flow.