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Surge Protection to BS7671 Unit 7: BS 7671 Regulations on Surge Protection - Part C

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Unit overview

Since overvoltage protection is likely to be required for protection against either atmospheric lightning or switching surges events, the aim of this unit is to introduce to you the difference between different type of surge protection devices and the approach BS 7671 adopted from IEC and HD 60364 to risk assess the need for surge protection against atmospheric lightning damages

Please note, It is recommended that you have studied Unit 5: BS 7671 Regulations on Surge Protection - Part 1 and Unit 6: BS 7671 Regulations on Surge Protection - Part 2 to fully appreciate this Unit.

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Level Technical
Partner Details

Mr Robin Earl, Market Development Manager, DEHN (UK) Ltd. 

Robin has over twenty years’ experience of the field surge protection, originally trained by DEHN and SOHNE prior to the establishment of the DEHN UK Office. He is currently serving in BS7671 JPEL64 subcommittee D on Surge Protection and Foundation Earthing. He has presented many CPD seminars on Surge Protection and Lightning protection to IET and CIBSE members.


Dr Tony Sung, Director, Energy Reduction Management Ltd

Tony is an independent Chartered Energy and Electrical Engineering Consultant. Tony was the course tutor for the MEng(Hons) degree course in Architectural Science and Engineering Services at Manchester University. He has given lectures in Lightning and Surge Protection to BEng(Hons), MEng(Hons) and MSc students in UK and Overseas universities. He is currently the Chairman of CIBSE Electrical Services Group and representing CIBSE on BS7671 the main JPEL64 committee. He is also External Examiner to the University of Northampton.

Type Unit
What you will learn
At the end of this unit, you will be able to:

1. Understand how to use BS 7671 to evaluate the Calculated Risk Level (CRL) for any electrical installation in the UK
2. Understand the lightning flash density Ng is an important factor in CRL evaluation
3. Understand the length of incoming HV and/or LV cables is an important factor in CRL evaluation
4. Understand the importance of lightning impulse withstand ability of equipment as required by BS 7671
5. Understand the difference between full and partial lightning current
6. Understand there are four types of surge protection devices - Type 1, Type 1/2, Type 2 and Type 3 and be introduced to the Lightning Protection Zones concept

Who should learn
The course will be useful for those who are involved with the design, installation, inspection, certification and approval/review of a non-complex electrical installation meeting BS7671 requirements for surge protection.
Other relevant courses available