German norms and standards (VDE 250 Teil 602) specify, that wires and cables, rated for 3kV can be considered as "short-circuit proof" and "earth-fault proof" in low-voltage installations (below 1000V). Typical cable of such kind is NSGAFÖU 1.8/3kV. I don't find any reference to such cables in english-spoken community, as well as any reference to what is a short-circuit proof cable means at all. So first question about "short-circuit proof" cable itself - Does it mean, that such cable can be connected without a fuse to more powerful circuit and in case of short-circuit it will just break gracefully, without any fire or insulation breakage, such as conventional wire would do? Is it protected from overload as well? Is there any EN/IEC standard specifying such application? Second question (might be not related), but why 3kV cable is considered as "short-circuit proof" cable being used in LV installation? Just because of better insulation? Is there any IEC/EN norm allowing such use?
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1\$\begingroup\$ I expect that it means that a 3 kV rated cable designed and manufactured to a recognized quality standard can be used in systems where the peak voltage is less than 1,000 volts without fear of it developing an internal short-circuit. \$\endgroup\$– Andy akaCommented Mar 31, 2023 at 10:12
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\$\begingroup\$ (For me, "short-circuit proof" has the wrong connotations. I'd prefer protected against ground faults and short circuits as a translation.) \$\endgroup\$– greybeardCommented Mar 31, 2023 at 11:12
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