Generally speaking, it will not exceed 3.5mA.
This is generally referred to the standards of individual products, I do not know if there are other requirements, if the common household appliances, lamps, IT, AV products, the second category of products can be accessible to the terminal enclosure, etc. 0.25mA, a product of the leakage current of the metal enclosure of the product, etc. 3.5mA. , Leakage current greater than 3.5mA is allowed, but a warning (large leakage current, must be grounded before turning on the power) is required.
So in general, not more than 3.5mA, usually not more than 0.25mA, refer to the standards of various products.
Leakage currents in power line filters
For safety reasons, the effects of leakage currents need to be considered when using passive EMl filters. Most manufacturers define leakage currents for each phase during normal operation.
In general, leakage current ratings are not the result of measurements, but are calculated values. The basics of leakage current are discussed, including standard requirements for leakage current, methods of calculating and measuring leakage current for three-phase and single-phase supply grids, and the effect of supply grid topology on leakage current.