The change of the shell structure and the overall sealing performance of the equipment may lead to the change of the electrical safety and electromagnetic compatibility performance. The administrative counterparts shall conduct an overall assessment of the change of the declared products and analyze the impact of the change on the electrical safety and electromagnetic compatibility performance. If the change has an impact on the above-mentioned performance, or if the standard terms of electrical safety and electromagnetic compatibility need to be re judged or evaluated, the testing shall be carried out; if there is no impact and the relevant terms that need to be re judged or evaluated, the testing may not be carried out.