IEC 62305-4 PDF

This standard does not cover protection against electromagnetic interference due to lightning, which may cause malfunctioning of internal systems. 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. Multi-user access to over 3, medical device standards, regulations, expert commentaries and other documents.

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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.

That's why lightning is such a serious threat to electronic systems. And that's why lightning protection should employ surge protectors capable of rapidly responding to large lightning currents clamping the overvoltages down to levels safe enough for the downstream equipment.

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. 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? Section 1 of the original tells us that the scope of this part of the standard includes the "information for the design, installation, inspection, maintenance, and testing" of Lightning PMS. According to Section 8. Risk Management is beyond the scope of this website, but anyone who's ever tried to actually use knows it is hopelessly complicated. With that introduction, we hope it will make sense if we say that Lightning PMS probably describes the headaches caused to those trying to apply it and the hot flashes that must be endured by the equipment being "protected" by it.

In the edition there seems to be a typo. Not a big deal. We still knew what they were referring to. Simple solution. If it were simply removed, all the above problems would vanish.

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IEC 62305-4

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