Electrical protection and lightning protection
I have a query on earthing system design. One designer has submitted me an earthing plan which interconnects the earth electrodes meant for equipment earthing and those for lightning protection purposes. By combining the earth electrodes he achieves overall earth resistance below one ohm required by IS 3043 (Indian standard). But my question is whether this is an acceptable practice followed by industry or the earth electrodes of the two systems (protective earthing and lightning protection) can not be combined this way?
Would appreciate feedback. thanks in advance.
Answer from Didier Mignardot: When Lightning Protection System (L.P.S.) is implemented, all metal conductors (including the electricity distribution network) must be interconnected.
Everything is described in IEC standard 62305-3 (Protection against Lightning: Physical damage to structures and life hazard) and in particular in the following chapters (5.4 & 6.1 extracts):
Please refer to this IEC standard 62305-3 and also other part like :
- IEC 62305-1: Protection against Lightning: General principles
- IEC 62305-2 : Protection against Lightning: Risk assessment
- IEC 62305-4 : Protection against Lightning : Electrical and electronic systems within structures
Ulinzi wa umeme na ulinzi wa umeme Nina swali juu ya kubuni mfumo wa ardhi. "Mmoja wa wabunifu ameniwasilisha mpango wa ardhi ambao unaunganisha ""electrodes za ardhi"" zilizokusudiwa kwa ajili ya vifaa vya ardhi na zile kwa madhumuni ya ulinzi wa umeme." Kwa kuchanganya electrodes ya ardhi, yeye hupata upinzani wa jumla wa ardhi chini ya ohm moja inayohitajika na IS 3043 (kiwango cha India). Lakini swali langu ni kama hii ni mazoezi ya kukubalika ikifuatiwa na viwanda au electrodes ardhi ya mifumo miwili (kulinda grounding na umeme ulinzi) haiwezi kuunganishwa kwa njia hii? Ningependa kupata maoni yako. asante mapema. Didier Mignard: Mfumo wa Ulinzi wa Umeme Mifumo ya umeme ya umeme ya umeme (mfumo wa umeme wa umeme) ni pamoja na mifumo ya umeme ya umeme (mfumo wa umeme wa umeme). "Kwa mujibu wa IEC 6230-3: ""Ulinzi dhidi ya umeme: uharibifu wa kimwili kwa miundo na hatari ya maisha"" (sura ya 5.4.1) na sehemu nyingine kama vile: ""Ulinzi dhidi ya umeme: kanuni za jumla"" (IEC 6230-3: ""Ulinzi dhidi ya umeme: tathmini ya hatari"")."