Insulation resistance between the main cores of the cable and between the main cores and the ground wire, converted to +20°C, should not be less than 160 MΩ·km.
2. Product Standard: MT818.8-1999.
3. MZ-type cable, consisting of 3 main cores, 1 ground core, and 1 control core, is then sheathed with a black chlorinated polyethylene rubber or black chloroprene rubber jacket.
4. Conductive wire core: Tin-plated soft copper wire is used, meeting the performance standards of GB/T3956-1997.
5. Insulation: Utilizes XJ-00A type rubber as specified in GB7594.2-1987.
6. Wire Core Identification: Utilizes insulated color coding for identification, with the main cores being red, green, and white. The ground wire is black. The control wire is marked with numbers.
7. Cable-making: Right-hand lay cables. Center with filler core. 
8. Sheath: Made of XH-03A rubber as specified in GB7594.7-1987.
9. The flame-retardant performance of MZ type finished cables meets the requirements of MT386-1995.
10. Cable Marking: The cable surface is imprinted with the model, voltage, specifications, and manufacturer's name.