PVS 222 is intended for fixed installation with clamped cable type A05VV‐U (EKK2x1.5mm²).
The information can be found in the Swedish National Electrical Safety Board's regulations and are general for installation products. If a product needs to be fused with a specific protection or value, it will be stipulated in the product sheet. Correctly installed with correct cable area, the distribution box's fuse is fully adequate.
Selection of over-current protection depends on two factors: the grid's dimensioning and the transformer's maximum rated current. Select the closest standard value.
Due to the transformers' starting current, thyristor-controlled dimmers are most suitable for control of iron core transformers.
Check that the fuse in the distribution box is intact and then try resetting the over-current protection on the transformer by pressing in the little button below the protective cover (it is not necessary to remove the cover). If the over-current protection trips again then there is presumably a fault in the installation after the transformer.
In the product sheet for the respective transformers there is a value specified for the theoretically calculated starting current. The rule of thumb for the inrush current is a quarter wavelength.
To be able to connect two transformers in parallel requires that they are of the same type and design.
The voltage is always higher when idling as there are no resistance losses in the winding in unloaded state. The voltage curve's characteristic varies depending on the transformer's design and size. The voltage curve is linear.
In general, a transformer should be loaded with the maximum rated load specified. For intermittent loads, for example, with a toaster or a kitchen appliance which is used temporarily, the transformer can be loaded with 125% of the rated load.