It needs to be determined according to the cable section size and installation quota. When manufacturing and installing five-core cable heads, the manufacturing and installing quota of cable heads with corresponding sections shall be multiplied by the coefficient 1.3, and the manufacturing and installing quota of six-core cable heads shall be multiplied by the coefficient 1.6, and the quota shall be increased by 30% for each additional core, and so on. Five-core mineral cable needs double grounding, that is, both ends need grounding.