IEC 62305-4:2010 pdf download.Protection against lightning
I Scope
This part of IEC 62305 provides information for the design, installation, inspection, maintenance and testing of electrical and electronic system protection (SPM) to reduce the risk of permanent failures due to lightning electromagnetic impulse (LEMP) within a structure.
This standard does not cover protection against electromagnetic interference due to lightning, which may cause malfunctioning of internal systems. However, the information reported in Annex A can also be used to evaluate such disturbances. Protection measures against electromagnetic interference are covered in IEC 60364-4-44 1 and in the IEC 61000 series
This standard provides guidelines for cooperation between the designer of the electrical and electronic system, and the designer of the protection measures, in an attempt to achieve optimum protection effectiveness.
This standard does not deal with detailed design of the electrical and electronic systems themselves.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60364-5-53:2001, Electrical installations of buildings — Part 5-53: Selection and erection of electrical equipment — Isolation, switching and control
IEC 60664-1:2007, Insulation coordination for equipment within low-voltage systems — Part 1:Principles, requirements and tests
IEC 61000-4-5:2005, Electromagnetic compatibility (EMC) — Part 4-5: Testing and measurement techniques — Surge immunity test
IEC 61000-4-9:1993, Electromagnetic compatibility (EMC) — Part 4-9: Testing and measurement techniques — Pulse magnetic field immunity test — Basic EMC Publication
IEC 61000-4-10:1993, Electromagnetic compatibility (EMC) — Part 4-10: Testing and measurement techniques — Damped oscillatory magnetic field immunity test — Basic EMC Publication
IEC 61643-1:2005, Low-voltage surge protective devices — Part 1: Surge protective devices connected to low-voltage power distribution systems — Requirements and tests
IEC 61643-12:2008, Low-voltage surge protective devices — Part 12: Surge protective devices connected to low-voltage power distribution systems — Selection and application principles
3.8 rated impulse withstand voltage level
Uw
impulse withstand voltage assigned by the manufacturer to the equipment or to a part of it,characterizing the specified withstand capability of its insulation against overvoltages
NOTE For the purposes of this part of IEC 62305, only withstand voltage between live conductors and earth is considered.
3.9 lightning protection level
LPL
number related to a set of lightning current parameters relevant to the probability that the associated maximum and minimum design values will not be exceeded in naturally occurring lightning
NOTE Lightning protection level is used to design protection measures according to the relevant set of lightning current parameters.
3.12 grid-like spatial shield
magnetic shield characterized by openings
NOTE For a building or a room, it is preferably built by interconnected natural metal components of the structure (e.g. rods of reinforcement in concrete, metal frames and metal supports).IEC 62305-4 pdf download.