Electrical Technology 2020-2-7
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True or False question: Please answer whether it is correct or incorrect. 3 points for a correct answer, 2 points for an incorrect answer, and 5 points for a detailed explanation of the reason. In dry rooms with poorly conductive floors such as wood, the enclosures of electrical equipment with an AC voltage of 380V or less do not require grounding.
Error. Regarding the requirement that grounding or connection to neutral is not necessary, it is stipulated as follows: For the enclosures of electrical equipment with an AC rated voltage of 380 V or less and a DC rated voltage of 440 V or less, in dry rooms with poor conductive floors such as wood or asphalt; this rule does not apply when maintenance personnel may come into contact with both the enclosure of the electrical equipment and a grounded object at the same time.
Error. Code for Construction and Acceptance of Grounding Systems in Electrical Installation Projects, Article 2.12: The following metal parts of electrical equipment may not be grounded or connected to the PEN wire: the enclosures of electrical equipment with an AC rated voltage of 380V or less, or a DC rated voltage of 440V or less, in dry rooms with poorly conductive floors such as wood or asphalt; however, they should still be grounded when there is a possibility of coming into contact simultaneously with the enclosures of such electrical equipment and other objects that are already grounded.