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See Chinese contents: GB/T 3805-2008 GB/T 3805-2008: Extra-low voltage (ELV) -- Limit values
This Standard gives guidance on the selection of voltage classes within Band I, as defined in GB/T 18379, for conductive parts that may be touched by human beings in various applications and environmental situations under both normal and fault conditions. After taking into account the significant factors, professional standardization technical committees may select voltage limit values other than those given in this Standard, if it is shown by experience that a reasonable safety level can be achieved. Voltage classes for patient contact in medical applications are not covered by this Standard. This Standard does not include any reference to insulation systems or to methods of protection. The conventional touch voltage limit value as defined in IEC 60050-826 for the purpose of automatic disconnection of the supply is not within the scope of this Standard.
