Skip to main content

SPD Calculator

A new ECA Member Benefit

This ECA Member online tool is designed to help you calculate the required factors and help determine if you need to install surge protection devices (SPD).

The below calculator has been created to assist Members in undertaking the calculation related to Regulation 443.5 and the Calculated Risk Level (CRL).  This can be used to determine if protection against transient overvoltage from atmospheric origin is required, or not.

Additional details related to this can be found in Section 443 of BS 7671:2018.