Huzhou Fuda Electrical Technology Co.,Ltd products

The preferred size of the nominal diameter of the conductor diameter conductor shall comply with the R20 number system in GB/T321-2005. The actual values and their tolerances are shown in Tables 1 and 2. When required for technical reasons, the intermediate size of the nominal diameter of the conductor selected by the user shall comply with the R40 number system in GB/T321-2005. See Appendix A for actual values and their tolerances. The difference between the conductor diameter and the nominal diameter shall not exceed the values specified in Table 1 or Table 2.