Installation guidelines for filters

The effectiveness of an AC power supply filter is determined at HF by its mounting rather than by its electrical operation. The following guidelines should be observed when installing filters in a cabinet:

  • Filter should be installed directly to the cable input in the cabinet if possible.

  • Filters are screwed directly to the unpainted wall or to the earth reference plane on the base of the cabinet.

  • The upstream and downstream cables may not be installed in parallel.

  • The upstream and downstream cables must be wired either side of the filter in order to limit the cross coupling effect between the input and output.

  • The filters cable must be wired directly across the cabinet wall or floor.

NOTE: Pay attention to leakage current from the filter! Special safety measures must be taken for leakage currents above AC 3.5 mA/DC 10 mA. Refer to the standards that apply in your country.

Example: Excellent Installation Locations

The following illustration shows two good solutions for installing a filter in a cabinet:

Example: Filters Installation

The following illustration shows the proper solution for installing filters cables on the cabinet wall or floor:

Example: Excellent Installation

The following illustration shows an excellent filter installation: