PV RISO, Phantom Iso Faul

Leakage current

 Leakage currents are often overlooked. They arise mainly from filters intended to reduce RFI and, although the contribution from each item of equipment is small, the combined sum can be significant. These currents originate from a capacitor divider across the supply voltage and therefore have an open circuit source voltage of half the supply voltage. Normally, this source point is grounded to the protective conductor. If a section of the protective conductor becomes isolated, for example a radial circuit protective conductor becomes disconnected at the distribution point, then the isolated protective conductor will float to half the supply voltage. The available source current will depend on the number of connected units - whether turned on or off is usually irrelevant - and may exceed the level at which contact may be lethal.

Proper practice is to ensure that the integrity of the ‘protective conductor’ is improved by providing more than one route from the equipment connection point back to the distribution point. At least one route must be a mechanically robust dedicated conductor while the other conductive path may be provided by cable armouring, conduit or cable trays. Note that if such a path is used, it must be installed and maintained in such a way that the integrity of the connection is assured. Since this type of leakage current is actually a feature of the design of the RFI filter in equipment it is now referred to simply as ‘protective conductor current’ in some installation codes.

The most important consideration for leakage current is the integrity of the protective conductor. The currents are relatively small, so that resistance is not an issue, but the risk of shock if the connection is lost is very high. The most difficult issue is how the integrity of the protective conductor can be preserved - there is no simple way to discover that the integrity has been compromised by the failure of one of the routes. Similarly, there is no indication of complete failure until an unfortunate user discovers it.

 ....very problematic also with datacommunication points , they will carry some "leakage" back to source....

from inverter point of view we need a "real" solid grounding as mentioned in prev. e mails, or via combining all "natural " resources via "grounding/bonding/earthing"

in multiple ways , as you did now with connecting row by row on top with aluminium wires- much easier with 5 core cabling as you "bring" the Earth via Transformer

towards the inverters/ db boxes and Pillars therefore combining "all sources" Earth related back to the "Grid".

Otherwise you will end up in many "stray currents " floating back via different paths towards Main ( Transformerstation ) uncontrollable

Elektro-Solar(Andreas Iliou)

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