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The information on this website is provided solely for educational and informational purposes. Permission is granted to download, display, print and reproduce this material in an unaltered form for personal non-commercial use or for use within your organization.  All other rights reserved.


The International Electrotechnical Commission (IEC) is thanked for permission to reproduce information from its International Standards IEC 62305-1 ed.2.0 (2010) and IEC 62305-4 ed.2.0 (2010). All such extracts are copyright of IEC, Geneva, Switzerland. All rights reserved. Further information on the IEC is available from IEC has no responsibility for the placement and context in which the extracts and contents are reproduced on this website, nor is IEC in any way responsible for the other content or accuracy therein.

The International Council on Large Electric Systems (CIGRE) is thanked for permission to reproduce information from CIGRE Technical Brochure 549 "Lightning Parameters for Engineering Applications" and from earlier Electra articles. All such extracts are copyrighted by CIGRE, Paris, France. All rights reserved. CIGRE bears no responsibility for the placement and context in which these extracts have been reproduced on this website and the views expressed herein are not necessarily those of CIGRE. Further information on CIGRE is available at The 2013 Technical Brochure "Lightning Parameters for Engineering Applications" can be purchased from CIGRE's webstore here.


The IEEE's website is warmly thanked for hosting a forum on the TEN350 issue. But this in no way implies endorsement of the website by either IEEE or its SPD Committee.


Nowhere on this website will you see any prohibition on using spark gap surge protectors or testing SPDs with a 10/350 test waveform. Those who want to, please go right ahead. What we object to are the false claims being made in defense of the mandatory requirement of these things in lightning protection standards.