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Generally, according to the location of electrical connection components, electrical connection components in electrical products can be divided into two parts: external electrical connection components and internal electrical connection components. External electrical connection components refer to all electrical connection components outside the product enclosure (electrical enclosure). These electrical connection components are not included in the protection of the product enclosure (electrical enclosure). Therefore, they must meet the corresponding electric shock protection requirements separately. Internal electrical connection components refer to all electrical connection components inside the product housing (electrical housing). These electrical connection components are included in the protection of the product housing (electrical housing), so generally only need to meet the corresponding functional insulation requirements. . Taking a common rice cooker as an example (see Figure 1), it uses the power cord assembly and the power grid connection to provide working power. The power cord assembly is connected to the interior of the rice cooker through a coupler, and the coupler is connected to the internal controller through an internal wire.