products IEC 60884-1 Clause 28.1.3 Figure 43 Insulating Sleeves of Plug Pins Abnormal Heat Resistance Test Device The LS-B17 Insulating Sleeves of Plug Pins Abnormal Heat Resistance Test Device fully meets IEC 60884-1:2022 Clause 28.1.3 Figure 43 (GB/T 2099.1-2021 Clause 28.1.3 and June 19, 2025