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Quick Selection Guide

The following is a quick selection guide which may assist in choosing whether SPD’s are required and the correct type of device
  • Does the installation contain a lightning protection system?
  • Is the installation adjacent to any tall structure, tall trees or near a hill top in a lightning prone area?
  • Does the installation contain equipment where higher reliability from overvoltages is required
If the answer is YES in the above to the first two questions, it is recommended to install a Type 1+2 device. This will provide protection against surges caused by direct lightning strikes and provide protection against transient over-voltages caused by indirect lightning strikes or by switching events.

If the answer is YES to the third question then it is recommended to install Type 2 devices to provide protection against transient over-voltages caused by indirect lightning strikes or by switching events.

SPD decision flow chart for installations within the scope of this guide



Note: For larger installations beyond the scope of this guide, a risk assessment method used to evaluate the need for SPDs is given in Section 442 of BS 7671:2008(2011).