Wendelstein 7-X is a modular advanced stellarator realizing a 5-period Helias configuration. An important part of the planned operational plasma scenarios is characterised by a rotational transform ι/2π =1 at the plasma boundary. Such configurations are very sensitive to symmetry breaking perturbations, resonant with the value of the rotational transform at the boundary and violating the toroidal periodicity of the magnetic field. The most critical consequences of magnetic field perturbations are modifications of the island topology, which can result in uneven loads on the divertor targets and affect the plasma performance. In this paper the level of magnetic field perturbations due to possible symmetry distortions under electromagnetic loads is estimated and comparative analysis with previously investigated magnetic field errors is presented
