Vincent

@Silverspur, In france, the protection by 30mA earth leakage circuit breaker is covered by the standard for electrical installations inside buildings (NF C 15-100), and has nothing to do with the design of the electronic device that connects to the building's electrical installation.

@Silverspur, Your project clearly falls into overvoltage category II. Standard EN 61010-1 stipulates in this case that the insulation distance and creepage distance between L and N must be at least 1.5 mm (on a PCB with pollution degree 2). Depending on the altitude of your project, a multiplication factor of up to x1.5 is applied. And if your product has reinforced insulation, you need to double the distances.