IEC 62305-4 PDF

That is the target against which all the major strategies and requirements are aimed. SPD requirement Modern electronic equipment can only survive within a relatively narrow voltage range. Too high, and it will fry!!! A circuit that runs off a nominal voltage of volts will not survive a surge of 10, volts. Conversely, spark gap SPDs aside from their other problems react far too slowly and allow too much voltage and current to get past them, so are not a good choice for protecting electronic equipment.

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That is the target against which all the major strategies and requirements are aimed. SPD requirement Modern electronic equipment can only survive within a relatively narrow voltage range.

Too high, and it will fry!!! A circuit that runs off a nominal voltage of volts will not survive a surge of 10, volts. Conversely, spark gap SPDs aside from their other problems react far too slowly and allow too much voltage and current to get past them, so are not a good choice for protecting electronic equipment.

Read more here. Despite all logic to the contrary, this standard specifies the use of spark gaps to play the principal role in protecting sensitive electronics. That is the first strike against it.

Because spark gaps cannot provide a low enough protection level to alone protect electronic equipment the standard must also specify the use of MOVs. More information on SPD coordination can be found here. In the parlance of this standard there are no such thing as "SPDs. LPZs-Lightning Protection Zones This standard starts by introducing the concept of lightning protection zones with the diagram to the right. Its importance is underscored with the statement that the protection of electronic equipment from lightning "is based on the lightning protection zone LPZ concept.

So what does this mean?

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BS EN 62305-4:2011 Protection against lightning

These parts of the standard are introduced here. In these parts underwent periodic technical review, with updated parts 1, 3 and 4 released in Updated part 2 is currently under discussion and is expected to be published in late It differs from BS in as much that this new part has four Classes or protection levels of LPS, as opposed to the basic two ordinary and high-risk levels in BS

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BS EN IEC 62305 Lightning protection standard

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IEC BS EN 62305 1 - 4

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