FAQ

• Why is there no strain relief on PVS 222? I cannot secure the cables.

  PVS 222 is intended for fixed installation with clamped cable type A05VV‐U (EKK2x1.5mm²).

• Primary fuse. What is the maximum primary fuse that you recommend? Is it possible to use 10A in the distribution board?

  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.

• Fuse on the secondary side. What fuse value should I select for the secondary side on a 24V transformer?

  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.

• Dimmer for iron core transformer. What type of dimmer is most suitable to control an iron core transformer?

  Due to the transformers' starting current, thyristor-controlled dimmers are most suitable for control of iron core transformers.

• Agriculture, no voltage to water troughs. The water for my horses has frozen and it seems that there is no current to the water troughs. What should I do?

  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.

• High inrush current 3-phase. What fuse do you recommend for the larger 3‐phase transformers?

  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.

• Is it possible to connect two transformers in parallel?

  To be able to connect two transformers in parallel requires that they are of the same type and design.

• Why does the voltage change?

  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.

• How much can I overload a transformer 230/115V?

  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.