{"id":3700,"date":"2026-08-14T19:25:51","date_gmt":"2026-08-14T19:25:51","guid":{"rendered":"https:\/\/huyuglobal.com\/?p=3700"},"modified":"2026-08-14T19:25:51","modified_gmt":"2026-08-14T19:25:51","slug":"maximum-resistance-recommended-for-commercial-building-electrical-installation","status":"publish","type":"post","link":"https:\/\/huyuglobal.com\/ru\/blog\/maximum-resistance-recommended-for-commercial-building-electrical-installation\/","title":{"rendered":"\u041c\u0430\u043a\u0441\u0438\u043c\u0430\u043b\u044c\u043d\u043e\u0435 \u0440\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0443\u0435\u043c\u043e\u0435 \u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435 \u0434\u043b\u044f \u044d\u043b\u0435\u043a\u0442\u0440\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0438 \u043a\u043e\u043c\u043c\u0435\u0440\u0447\u0435\u0441\u043a\u043e\u0433\u043e \u0437\u0434\u0430\u043d\u0438\u044f"},"content":{"rendered":"<p>\u0412 \u0432\u0430\u0448 \u043a\u043e\u043c\u043c\u0435\u0440\u0447\u0435\u0441\u043a\u0438\u0439 \u043e\u0431\u044a\u0435\u043a\u0442 \u043f\u0440\u0438\u0445\u043e\u0434\u0438\u0442 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u0438\u0441\u0442 \u0434\u043b\u044f \u043f\u0440\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u044d\u043b\u0435\u043a\u0442\u0440\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438. \u0418\u043d\u0436\u0435\u043d\u0435\u0440 \u0441\u043e\u043e\u0431\u0449\u0430\u0435\u0442 \u0435\u043c\u0443, \u0447\u0442\u043e \u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435 \u0437\u0430\u0437\u0435\u043c\u043b\u044f\u044e\u0449\u0435\u0433\u043e \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u0434\u0430 \u0431\u044b\u043b\u043e \u0438\u0437\u043c\u0435\u0440\u0435\u043d\u043e \u0438 \u0441\u043e\u0441\u0442\u0430\u0432\u0438\u043b\u043e 22 \u041e\u043c. \u041a\u0442\u043e-\u0442\u043e \u0440\u044f\u0434\u043e\u043c \u0433\u043e\u0432\u043e\u0440\u0438\u0442, \u0447\u0442\u043e \u043f\u043e\u0441\u043a\u043e\u043b\u044c\u043a\u0443 NEC \u0434\u043e\u043f\u0443\u0441\u043a\u0430\u0435\u0442 25 \u041e\u043c, \u0442\u043e \u0432\u0441\u0451 \u0432 \u043f\u043e\u0440\u044f\u0434\u043a\u0435. \u041d\u043e \u0440\u0443\u043a\u043e\u0432\u043e\u0434\u0441\u0442\u0432\u043e \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044f \u043e\u0431\u043e\u0440\u0443\u0434\u043e\u0432\u0430\u043d\u0438\u044f \u0443\u043a\u0430\u0437\u044b\u0432\u0430\u0435\u0442, \u0447\u0442\u043e \u043c\u0430\u043a\u0441\u0438\u043c\u0430\u043b\u044c\u043d\u043e\u0435 \u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435 \u0434\u043e\u043b\u0436\u043d\u043e \u0431\u044b\u0442\u044c 5 \u041e\u043c, \u0442\u0430\u043a \u043a\u0430\u043a \u043e\u0431\u043e\u0440\u0443\u0434\u043e\u0432\u0430\u043d\u0438\u0435 \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 \u0441 \u0447\u0443\u0432\u0441\u0442\u0432\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0439 \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u043d\u0438\u043a\u043e\u0439; \u043f\u043e\u044d\u0442\u043e\u043c\u0443 \u0438\u043d\u0436\u0435\u043d\u0435\u0440 \u043f\u043e \u0432\u0432\u043e\u0434\u0443 \u0432 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u044e \u0441\u0441\u044b\u043b\u0430\u0435\u0442\u0441\u044f \u043d\u0430 \u0441\u043f\u0435\u0446\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u044e, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u0434\u043b\u044f \u0432\u0430\u0441 \u043d\u043e\u0432\u0430\u044f. \u041a\u0430\u043a\u043e\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u0441\u043b\u0435\u0434\u0443\u0435\u0442 \u0443\u0447\u0438\u0442\u044b\u0432\u0430\u0442\u044c? 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\u043f\u043e\u0434\u0441\u0442\u0430\u043d\u0446\u0438\u0439 \u0438 \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u0441\u0442\u0430\u043d\u0446\u0438\u0439. \u0412 \u0438\u0442\u043e\u0433\u0435 \u043c\u0438\u043d\u0438\u043c\u0430\u043b\u044c\u043d\u044b\u0435 \u0442\u0440\u0435\u0431\u043e\u0432\u0430\u043d\u0438\u044f NEC \u043d\u0435 \u0441\u0432\u044f\u0437\u0430\u043d\u044b \u0441 \u0442\u0440\u0435\u0431\u043e\u0432\u0430\u043d\u0438\u044f\u043c\u0438 \u043a \u0445\u0430\u0440\u0430\u043a\u0442\u0435\u0440\u0438\u0441\u0442\u0438\u043a\u0430\u043c, \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u043d\u044b\u043c\u0438 IEEE \u0432 \u0434\u0438\u0430\u043f\u0430\u0437\u043e\u043d\u0435 1-5 \u041e\u043c \u0434\u043b\u044f \u043a\u043e\u043c\u043c\u0435\u0440\u0447\u0435\u0441\u043a\u0438\u0445 \u0437\u0434\u0430\u043d\u0438\u0439, \u0447\u0442\u043e \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043e\u0431\u0449\u0435\u043f\u0440\u0438\u043d\u044f\u0442\u043e\u0439 \u0446\u0435\u043b\u0435\u0432\u043e\u0439 \u0432\u0435\u043b\u0438\u0447\u0438\u043d\u043e\u0439 \u0432 \u043e\u0442\u0440\u0430\u0441\u043b\u0438, \u0432 \u0442\u043e \u0432\u0440\u0435\u043c\u044f \u043a\u0430\u043a \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u0432\u044b\u0448\u0435 25 \u041e\u043c \u0441\u0447\u0438\u0442\u0430\u044e\u0442\u0441\u044f \u043f\u043b\u043e\u0445\u0438\u043c\u0438 \u0438 \u043d\u0435\u043f\u0440\u0438\u0435\u043c\u043b\u0435\u043c\u044b\u043c\u0438 \u0434\u043b\u044f \u0437\u0430\u0437\u0435\u043c\u043b\u044f\u044e\u0449\u0435\u0433\u043e \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u0434\u0430 \u0432 \u043a\u043e\u043c\u043c\u0435\u0440\u0447\u0435\u0441\u043a\u0438\u0445 \u043e\u0431\u044a\u0435\u043a\u0442\u0430\u0445.<\/p><\/blockquote>\n<p>\u0411\u0443\u0434\u0435\u043c \u0442\u043e\u0447\u043d\u044b, \u043f\u043e\u0442\u043e\u043c\u0443 \u0447\u0442\u043e \u0438\u043c\u0435\u043d\u043d\u043e \u0437\u0434\u0435\u0441\u044c \u0432\u043e\u0437\u043d\u0438\u043a\u0430\u0435\u0442 \u0434\u0435\u0437\u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f. \u0421\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0443\u044e\u0449\u0438\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u0441 \u0438\u0445 \u0438\u0441\u0442\u043e\u0447\u043d\u0438\u043a\u0430\u043c\u0438:<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3702\" src=\"https:\/\/huyuglobal.com\/wp-content\/uploads\/2026\/08\/traget-5-ohms-or-less.webp\" alt=\"traget 5 ohms or less\" width=\"1448\" height=\"1086\" \/><\/p>\n<table>\n<thead>\n<tr>\n<th>\u0421\u0442\u0430\u043d\u0434\u0430\u0440\u0442 \/ \u0420\u0443\u043a\u043e\u0432\u043e\u0434\u0441\u0442\u0432\u043e<\/th>\n<th>\u0417\u043d\u0430\u0447\u0435\u043d\u0438\u0435<\/th>\n<th>\u041a \u0447\u0435\u043c\u0443 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u0442\u0441\u044f<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>NEC 250.53 (NFPA 70)<\/td>\n<td>25 \u041e\u043c<\/td>\n<td>\u041e\u0434\u0438\u043d \u0441\u0442\u0435\u0440\u0436\u0435\u043d\u044c\/\u043f\u043b\u0430\u0441\u0442\u0438\u043d\u0430 \u2014 \u0435\u0441\u043b\u0438 \u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435 \u043d\u0435 \u043f\u0440\u0435\u0432\u044b\u0448\u0430\u0435\u0442 25 \u041e\u043c, \u0432\u0442\u043e\u0440\u043e\u0439 \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u0434 \u043d\u0435 \u0442\u0440\u0435\u0431\u0443\u0435\u0442\u0441\u044f<\/td>\n<\/tr>\n<tr>\n<td>\u0417\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e NEC 250.53<\/td>\n<td>\u0414\u0432\u0430 \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u0434\u0430<\/td>\n<td>\u0421\u0442\u0435\u0440\u0436\u043d\u0435\u0432\u044b\u0435\/\u0442\u0440\u0443\u0431\u0447\u0430\u0442\u044b\u0435\/\u043f\u043b\u0430\u0441\u0442\u0438\u043d\u0447\u0430\u0442\u044b\u0435 \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u0434\u044b \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u0443\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u044e\u0442\u0441\u044f \u0432 \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u0435 \u0434\u0432\u0443\u0445; \u0442\u0435\u0441\u0442 \u043d\u0430 25 \u041e\u043c \u043d\u0435 \u0442\u0440\u0435\u0431\u0443\u0435\u0442\u0441\u044f, \u0435\u0441\u043b\u0438 \u043e\u0431\u0430 \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u044b<\/td>\n<\/tr>\n<tr>\n<td>IEEE Std 142 (\u0417\u0435\u043b\u0451\u043d\u0430\u044f \u043a\u043d\u0438\u0433\u0430)<\/td>\n<td>1\u20135 \u041e\u043c<\/td>\n<td>\u0420\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0443\u0435\u043c\u043e\u0435 \u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435 \u0437\u0430\u0437\u0435\u043c\u043b\u0435\u043d\u0438\u044f \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0433\u043e \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u0434\u0430 \u0434\u043b\u044f \u043a\u0440\u0443\u043f\u043d\u044b\u0445 \u043a\u043e\u043c\u043c\u0435\u0440\u0447\u0435\u0441\u043a\u0438\u0445 \u0438 \u043f\u0440\u043e\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c<\/td>\n<\/tr>\n<tr>\n<td>IEEE Std 80<\/td>\n<td>0,5\u20131 \u041e\u043c<\/td>\n<td>\u0417\u0430\u0437\u0435\u043c\u043b\u044f\u044e\u0449\u0438\u0435 \u0441\u0435\u0442\u0438 \u043f\u043e\u0434\u0441\u0442\u0430\u043d\u0446\u0438\u0439 \/ \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u0441\u0442\u0430\u043d\u0446\u0438\u0439<\/td>\n<\/tr>\n<tr>\n<td>\u0420\u0443\u043a\u043e\u0432\u043e\u0434\u0441\u0442\u0432\u0430 \u043e\u0442\u0440\u0430\u0441\u043b\u0438 NFPA\/IEEE<\/td>\n<td>5 \u041e\u043c \u0438\u043b\u0438 \u043c\u0435\u043d\u044c\u0448\u0435<\/td>\n<td>\u0427\u0430\u0441\u0442\u043e \u0446\u0438\u0442\u0438\u0440\u0443\u0435\u043c\u0430\u044f \u0446\u0435\u043b\u0435\u0432\u0430\u044f \u0432\u0435\u043b\u0438\u0447\u0438\u043d\u0430 \u0434\u043b\u044f \u043a\u043e\u043c\u043c\u0435\u0440\u0447\u0435\u0441\u043a\u0438\u0445 \u043e\u0431\u044a\u0435\u043a\u0442\u043e\u0432; \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442 \u0442\u0435\u043b\u0435\u043a\u043e\u043c\u043c\u0443\u043d\u0438\u043a\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u043e\u0442\u0440\u0430\u0441\u043b\u0438<\/td>\n<\/tr>\n<tr>\n<td>\u041f\u0440\u0438\u0451\u043c\u043e\u0447\u043d\u044b\u0435 \u0438\u0441\u043f\u044b\u0442\u0430\u043d\u0438\u044f NETA ATS<\/td>\n<td>5 \u041e\u043c \/ 1 \u041e\u043c<\/td>\n<td>\u22645\u03a9 \u0434\u043b\u044f \u043a\u0440\u0443\u043f\u043d\u044b\u0445 \u043a\u043e\u043c\u043c\u0435\u0440\u0447\u0435\u0441\u043a\u0438\u0445\/\u043f\u0440\u043e\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u044b\u0445 \u043e\u0431\u044a\u0435\u043a\u0442\u043e\u0432; \u22641\u03a9 \u0434\u043b\u044f \u0433\u0435\u043d\u0435\u0440\u0438\u0440\u0443\u044e\u0449\u0438\u0445\/\u0442\u0440\u0430\u043d\u0441\u0444\u043e\u0440\u043c\u0430\u0442\u043e\u0440\u043d\u044b\u0445 \u0441\u0442\u0430\u043d\u0446\u0438\u0439<\/td>\n<\/tr>\n<tr>\n<td>\u041f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u0438 \u043e\u0431\u043e\u0440\u0443\u0434\u043e\u0432\u0430\u043d\u0438\u044f<\/td>\n<td>&lt;1 \u0434\u043e 5 \u043e\u043c<\/td>\n<td>\u0422\u0435\u0445\u043d\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u0445\u0430\u0440\u0430\u043a\u0442\u0435\u0440\u0438\u0441\u0442\u0438\u043a\u0438 \u0447\u0443\u0432\u0441\u0442\u0432\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0439 \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u043d\u0438\u043a\u0438 \/ \u043c\u0435\u0434\u0438\u0446\u0438\u043d\u0441\u043a\u043e\u0433\u043e \u0434\u0438\u0430\u0433\u043d\u043e\u0441\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0433\u043e \u043e\u0431\u043e\u0440\u0443\u0434\u043e\u0432\u0430\u043d\u0438\u044f<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u0412\u0430\u0436\u043d\u044b\u0439 \u0444\u0430\u043a\u0442: \u0432 NEC \u043d\u0435\u0442 \u0442\u0440\u0435\u0431\u043e\u0432\u0430\u043d\u0438\u044f, \u0447\u0442\u043e\u0431\u044b \u043a\u043e\u043c\u043c\u0435\u0440\u0447\u0435\u0441\u043a\u043e\u0435 \u0437\u0430\u0437\u0435\u043c\u043b\u0435\u043d\u0438\u0435 \u0431\u044b\u043b\u043e \u201c25 \u043e\u043c \u0438\u043b\u0438 \u043c\u0435\u043d\u044c\u0448\u0435\u201d. \u0427\u0438\u0441\u043b\u043e 25 \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u043e \u0442\u043e\u043b\u044c\u043a\u043e \u0434\u043b\u044f \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e\u0433\u043e \u0440\u0430\u0441\u0441\u0442\u043e\u044f\u043d\u0438\u044f \u043e\u0442 \u043e\u0434\u043d\u043e\u0433\u043e \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u0434\u0430. \u0422\u0440\u0435\u0431\u043e\u0432\u0430\u043d\u0438\u044f \u043f\u043e \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438, \u0442\u0430\u043a\u0438\u0435 \u043a\u0430\u043a IEEE 142 \u0438 \u0440\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0430\u0446\u0438\u0438 NETA, \u0430 \u0442\u0430\u043a\u0436\u0435 \u043f\u0440\u0430\u043a\u0442\u0438\u043a\u0430, \u043f\u0440\u0435\u0434\u043f\u043e\u043b\u0430\u0433\u0430\u044e\u0442 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u043e\u0442 1 \u0434\u043e 5 \u043e\u043c \u2014 \u043f\u0440\u0438 \u044d\u0442\u043e\u043c 5 \u043e\u043c \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043d\u0430\u0438\u0431\u043e\u043b\u0435\u0435 \u0447\u0430\u0441\u0442\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u044b\u043c \u043f\u0440\u0435\u0434\u0435\u043b\u043e\u043c.<\/p>\n<h2>\u041f\u0440\u0430\u0432\u0438\u043b\u043e NEC \u043e 25 \u043e\u043c\u0430\u0445 \u2014 \u0447\u0442\u043e \u043e\u043d\u043e \u0434\u0435\u0439\u0441\u0442\u0432\u0438\u0442\u0435\u043b\u044c\u043d\u043e \u043e\u0437\u043d\u0430\u0447\u0430\u0435\u0442<\/h2>\n<p>\u0421\u043e\u0433\u043b\u0430\u0441\u043d\u043e \u0440\u0430\u0437\u0434\u0435\u043b\u0443 NEC 250.53(A)(2) (\u0430 \u0442\u0430\u043a\u0436\u0435 \u0440\u0430\u0437\u0434\u0435\u043b\u0443 250-56 NEC 2005 \u0433\u043e\u0434\u0430), \u043a\u043e\u0434\u0435\u043a\u0441 \u0442\u0440\u0435\u0431\u0443\u0435\u0442 \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0443 \u0434\u0432\u0443\u0445 \u0437\u0430\u0437\u0435\u043c\u043b\u044f\u044e\u0449\u0438\u0445 \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u0434\u043e\u0432. \u041e\u0434\u043d\u0430\u043a\u043e \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0443\u0435\u0442 \u0432\u0430\u0436\u043d\u043e\u0435 \u0438\u0441\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435, \u043a\u043e\u0442\u043e\u0440\u043e\u0435 \u0434\u043e\u043f\u0443\u0441\u043a\u0430\u0435\u0442 \u043e\u0434\u0438\u043d \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u0434, \u0435\u0441\u043b\u0438 \u043e\u043d \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0443\u0435\u0442 \u0442\u0440\u0435\u0431\u0443\u0435\u043c\u043e\u043c\u0443 \u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u044e \u0437\u0430\u0437\u0435\u043c\u043b\u0435\u043d\u0438\u044f 25 \u043e\u043c \u0438\u043b\u0438 \u043c\u0435\u043d\u044c\u0448\u0435. \u041a \u0441\u043e\u0436\u0430\u043b\u0435\u043d\u0438\u044e, \u044d\u0442\u043e \u0447\u0430\u0441\u0442\u043e \u043d\u0435\u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u043e \u0438\u043d\u0442\u0435\u0440\u043f\u0440\u0435\u0442\u0438\u0440\u0443\u0435\u0442\u0441\u044f \u043a\u0430\u043a \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u0438\u0442\u044c \u0442\u043e\u043b\u044c\u043a\u043e \u043e\u0434\u0438\u043d \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u0434, \u043f\u0440\u043e\u0432\u0435\u0440\u0438\u0442\u044c \u0435\u0433\u043e \u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435, \u0430 \u0437\u0430\u0442\u0435\u043c \u0434\u043e\u0431\u0430\u0432\u0438\u0442\u044c \u0432\u0442\u043e\u0440\u043e\u0439 \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u0434, \u0435\u0441\u043b\u0438 \u043f\u0435\u0440\u0432\u044b\u0439 \u043d\u0435 \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0443\u0435\u0442 \u0442\u0440\u0435\u0431\u043e\u0432\u0430\u043d\u0438\u044e \u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u044f \u0432 25 \u043e\u043c.<\/p>\n<p>\u041d\u0430 \u0441\u0430\u043c\u043e\u043c \u0434\u0435\u043b\u0435, \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u0435 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u0435:<\/p>\n<ul>\n<li>\u041f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e = \u0434\u0432\u0430 \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u0434\u0430, \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u043d\u044b\u0435 \u043d\u0430 \u0440\u0430\u0441\u0441\u0442\u043e\u044f\u043d\u0438\u0438 \u043d\u0435 \u043c\u0435\u043d\u0435\u0435 6 \u0444\u0443\u0442\u043e\u0432 \u0434\u0440\u0443\u0433 \u043e\u0442 \u0434\u0440\u0443\u0433\u0430.<\/li>\n<li>\u0414\u043e\u043f\u0443\u0441\u043a\u0430\u0435\u0442\u0441\u044f = \u043e\u0434\u0438\u043d \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u0434, \u043f\u0440\u043e\u0448\u0435\u0434\u0448\u0438\u0439 \u043d\u0430\u0434\u043b\u0435\u0436\u0430\u0449\u0438\u0439 \u0442\u0435\u0441\u0442 \u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u044f, \u043f\u043e\u0434\u0442\u0432\u0435\u0440\u0436\u0434\u0430\u044e\u0449\u0438\u0439, \u0447\u0442\u043e \u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435 \u0437\u0430\u0437\u0435\u043c\u043b\u0435\u043d\u0438\u044f \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 25\u03a9 \u0438\u043b\u0438 \u043c\u0435\u043d\u044c\u0448\u0435.<\/li>\n<\/ul>\n<p>\u0412 \u0441\u043b\u0443\u0447\u0430\u0435 \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0438 \u0432\u0442\u043e\u0440\u043e\u0433\u043e \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u0434\u0430 \u043a\u043e\u043c\u0431\u0438\u043d\u0430\u0446\u0438\u044f \u043d\u0435 \u043e\u0431\u044f\u0437\u0430\u043d\u0430 \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u043e\u0432\u0430\u0442\u044c \u0443\u0441\u043b\u043e\u0432\u0438\u044e 25 \u043e\u043c \u2014 \u043f\u043e\u0441\u043a\u043e\u043b\u044c\u043a\u0443 \u0432\u0442\u043e\u0440\u043e\u0439 \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u0434 \u0441\u0447\u0438\u0442\u0430\u0435\u0442\u0441\u044f \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0443\u044e\u0449\u0438\u043c \u0442\u0440\u0435\u0431\u043e\u0432\u0430\u043d\u0438\u044f\u043c NEC \u043f\u043e \u0444\u0430\u043a\u0442\u0443 \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0438.<\/p>\n<h2>IEEE 142 (\u0417\u0435\u043b\u0435\u043d\u0430\u044f \u043a\u043d\u0438\u0433\u0430): \u0440\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0430\u0446\u0438\u044f 1\u20135 \u041e\u043c<\/h2>\n<p>\u0412\u043e\u043f\u0440\u043e\u0441 \u201c\u043a\u0430\u043a\u043e\u0435 \u0440\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0443\u0435\u043c\u043e\u0435 \u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435 \u0434\u043b\u044f \u043a\u043e\u043c\u043c\u0435\u0440\u0447\u0435\u0441\u043a\u043e\u0433\u043e \u0437\u0434\u0430\u043d\u0438\u044f?\u201d \u043f\u043e\u043b\u0443\u0447\u0430\u0435\u0442 \u0430\u0432\u0442\u043e\u0440\u0438\u0442\u0435\u0442\u043d\u043e\u0435 \u0438\u043d\u0436\u0435\u043d\u0435\u0440\u043d\u043e\u0435 \u0440\u0435\u0448\u0435\u043d\u0438\u0435 \u0432 IEEE Std 142, \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u043e\u043c \u043a\u0430\u043a \u0417\u0435\u043b\u0435\u043d\u0430\u044f \u043a\u043d\u0438\u0433\u0430. \u0420\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0430\u0446\u0438\u044f \u2014 \u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435 \u0437\u0430\u0437\u0435\u043c\u043b\u0435\u043d\u0438\u044f \u043e\u0442 1 \u0434\u043e 5 \u043e\u043c \u0434\u043b\u044f \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0433\u043e \u0437\u0430\u0437\u0435\u043c\u043b\u044f\u044e\u0449\u0435\u0433\u043e \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u0434\u0430 \u0432 \u043a\u0440\u0443\u043f\u043d\u044b\u0445 \u043f\u0440\u043e\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u044b\u0445 \u0438 \u043a\u043e\u043c\u043c\u0435\u0440\u0447\u0435\u0441\u043a\u0438\u0445 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445.<\/p>\n<p>\u041f\u0440\u0438\u0447\u0438\u043d\u0430 \u043f\u0440\u0435\u0434\u043f\u043e\u0447\u0442\u0435\u043d\u0438\u044f \u044d\u0442\u043e\u0433\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u044f \u0432\u043c\u0435\u0441\u0442\u043e 25 \u043e\u043c \u0437\u0430\u043a\u043b\u044e\u0447\u0430\u0435\u0442\u0441\u044f \u0432 \u0442\u043e\u043c, \u0447\u0442\u043e \u043a\u043e\u043c\u043c\u0435\u0440\u0447\u0435\u0441\u043a\u0438\u0435 \u043e\u0431\u044a\u0435\u043a\u0442\u044b \u0447\u0430\u0441\u0442\u043e \u043e\u0441\u043d\u0430\u0449\u0435\u043d\u044b \u0447\u0443\u0432\u0441\u0442\u0432\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0439 \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u043d\u0438\u043a\u043e\u0439 \u0438 \u0442. \u0434., \u0438 \u043f\u043e\u044d\u0442\u043e\u043c\u0443 \u043d\u0443\u0436\u0434\u0430\u044e\u0442\u0441\u044f \u0432 \u043e\u0447\u0435\u043d\u044c \u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u043e\u0439 \u0438 \u043d\u0438\u0437\u043a\u043e\u0438\u043c\u043f\u0435\u0434\u0430\u043d\u0441\u043d\u043e\u0439 \u0437\u0430\u0437\u0435\u043c\u043b\u044f\u044e\u0449\u0435\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u0435, \u0447\u0435\u0433\u043e \u043d\u0435\u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e \u043f\u0440\u0438 \u043c\u0438\u043d\u0438\u043c\u0430\u043b\u044c\u043d\u044b\u0445 \u0442\u0440\u0435\u0431\u043e\u0432\u0430\u043d\u0438\u044f\u0445 \u043a\u043e\u0434\u0430. \u041d\u0438\u0437\u043a\u043e\u0435 \u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435 \u0437\u0430\u0437\u0435\u043c\u043b\u0435\u043d\u0438\u044f, \u0443\u043a\u0430\u0437\u0430\u043d\u043d\u043e\u0435 \u0432\u044b\u0448\u0435, \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u0435\u0442:<\/p>\n<ul>\n<li>\u0411\u043e\u043b\u0435\u0435 \u0431\u044b\u0441\u0442\u0440\u044b\u0439 \u0432\u043e\u0437\u0432\u0440\u0430\u0442 \u0442\u043e\u043a\u0430 \u043a\u043e\u0440\u043e\u0442\u043a\u043e\u0433\u043e \u0437\u0430\u043c\u044b\u043a\u0430\u043d\u0438\u044f \u043a \u0438\u0441\u0442\u043e\u0447\u043d\u0438\u043a\u0443<\/li>\n<li>\u041c\u0435\u043d\u044c\u0448\u0435\u0435 \u043f\u043e\u0432\u044b\u0448\u0435\u043d\u0438\u0435 \u043d\u0430\u043f\u0440\u044f\u0436\u0435\u043d\u0438\u044f \u043d\u0430 \u043a\u043e\u0440\u043f\u0443\u0441\u0435 \u043e\u0431\u043e\u0440\u0443\u0434\u043e\u0432\u0430\u043d\u0438\u044f \u0432\u043e \u0432\u0440\u0435\u043c\u044f \u043d\u0435\u0438\u0441\u043f\u0440\u0430\u0432\u043d\u043e\u0441\u0442\u0438<\/li>\n<li>\u041b\u0443\u0447\u0448\u0435\u0435 \u0440\u0430\u0441\u0441\u0435\u0438\u0432\u0430\u043d\u0438\u0435 \u0438\u043c\u043f\u0443\u043b\u044c\u0441\u043e\u0432 \u043c\u043e\u043b\u043d\u0438\u0438<\/li>\n<li>\u041c\u0435\u043d\u044c\u0448\u0435 \u044d\u043b\u0435\u043a\u0442\u0440\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u043f\u043e\u043c\u0435\u0445<\/li>\n<\/ul>\n<p>\u0412 \u0438\u0442\u043e\u0433\u0435, \u043a\u043e\u0434\u0435\u043a\u0441 \u0442\u0440\u0435\u0431\u0443\u0435\u0442 25 \u043e\u043c; \u0441 \u0438\u043d\u0436\u0435\u043d\u0435\u0440\u043d\u043e\u0439 \u0442\u043e\u0447\u043a\u0438 \u0437\u0440\u0435\u043d\u0438\u044f, \u0434\u043b\u044f \u0445\u043e\u0440\u043e\u0448\u0435\u0439 \u0440\u0430\u0431\u043e\u0442\u044b \u0442\u0440\u0435\u0431\u0443\u0435\u0442\u0441\u044f \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 1-5 \u043e\u043c.<\/p>\n<p>&nbsp;<\/p>\n<h2>\u041e\u0442\u0440\u0430\u0441\u043b\u0435\u0432\u0430\u044f \u043f\u0440\u0430\u043a\u0442\u0438\u043a\u0430: 5 \u041e\u043c \u043a\u0430\u043a \u043a\u043e\u043c\u043c\u0435\u0440\u0447\u0435\u0441\u043a\u0430\u044f \u0446\u0435\u043b\u044c<\/h2>\n<p>\u041d\u0430 \u043f\u0440\u0430\u043a\u0442\u0438\u043a\u0435 \u0431\u043e\u043b\u044c\u0448\u0438\u043d\u0441\u0442\u0432\u043e \u043b\u044e\u0434\u0435\u0439 \u0441\u043b\u044b\u0448\u0430\u0442 \u0434\u043b\u044f \u043a\u043e\u043c\u043c\u0435\u0440\u0447\u0435\u0441\u043a\u0438\u0445 \u0441\u0438\u0441\u0442\u0435\u043c \u201c5 \u043e\u043c \u0438\u043b\u0438 \u043c\u0435\u043d\u044c\u0448\u0435\u201d. \u042d\u0442\u043e \u0438\u0441\u0445\u043e\u0434\u0438\u0442 \u0438\u0437 \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u0445, \u043d\u043e \u0432\u0437\u0430\u0438\u043c\u043e\u0434\u043e\u043f\u043e\u043b\u043d\u044f\u044e\u0449\u0438\u0445 \u0438\u0441\u0442\u043e\u0447\u043d\u0438\u043a\u043e\u0432, \u0442\u0430\u043a\u0438\u0445 \u043a\u0430\u043a:<\/p>\n<ul>\n<li>\u0440\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0430\u0446\u0438\u0438 NFPA \u0438 IEEE \u043e 5,0 \u043e\u043c \u0438\u043b\u0438 \u043c\u0435\u043d\u044c\u0448\u0435 \u043a\u0430\u043a \u0445\u043e\u0440\u043e\u0448\u0435\u0439 \u0446\u0435\u043b\u0438<\/li>\n<li>\u043f\u043e\u0434\u0445\u043e\u0434\u044b \u0432 \u0442\u0435\u043b\u0435\u043a\u043e\u043c\u043c\u0443\u043d\u0438\u043a\u0430\u0446\u0438\u044f\u0445 (5 \u043e\u043c \u0438\u043b\u0438 \u043c\u0435\u043d\u044c\u0448\u0435 \u0434\u043b\u044f \u0437\u0430\u0437\u0435\u043c\u043b\u0435\u043d\u0438\u044f \u0438 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f)<\/li>\n<li>\u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u044b NETA \u0434\u043b\u044f \u043f\u0440\u0438\u0435\u043c\u043e\u0447\u043d\u044b\u0445 \u0438\u0441\u043f\u044b\u0442\u0430\u043d\u0438\u0439 (\u22645 \u043e\u043c \u0434\u043b\u044f \u043a\u043e\u043c\u043c\u0435\u0440\u0447\u0435\u0441\u043a\u0438\u0445\/\u043f\u0440\u043e\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c; \u22641 \u043e\u043c \u0434\u043b\u044f \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u0441\u0442\u0430\u043d\u0446\u0438\u0439\/\u0442\u0440\u0430\u043d\u0441\u0444\u043e\u0440\u043c\u0430\u0442\u043e\u0440\u043d\u044b\u0445 \u043f\u043e\u0434\u0441\u0442\u0430\u043d\u0446\u0438\u0439)<\/li>\n<li>\u0446\u0438\u0444\u0440\u044b, \u043f\u0440\u0438\u0432\u0435\u0434\u0451\u043d\u043d\u044b\u0435 \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u043c\u0438 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044f\u043c\u0438 \u043e\u0431\u043e\u0440\u0443\u0434\u043e\u0432\u0430\u043d\u0438\u044f (\u043e\u0442 1 \u0434\u043e 5 \u043e\u043c \u0434\u043b\u044f \u0447\u0443\u0432\u0441\u0442\u0432\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0439 \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u043d\u0438\u043a\u0438)<\/li>\n<\/ul>\n<p>\u0421\u043e\u0433\u043b\u0430\u0441\u043d\u043e \u043e\u0431\u0449\u0438\u043c \u0440\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0430\u0446\u0438\u044f\u043c \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u0445 \u0438\u043d\u0436\u0435\u043d\u0435\u0440\u043e\u0432 \u0438 \u0442\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0449\u0438\u043a\u043e\u0432, 5 \u043e\u043c \u0438\u043b\u0438 \u043c\u0435\u043d\u044c\u0448\u0435 \u0441\u0447\u0438\u0442\u0430\u0435\u0442\u0441\u044f \u0445\u043e\u0440\u043e\u0448\u0438\u043c \u043f\u043e\u043a\u0430\u0437\u0430\u0442\u0435\u043b\u0435\u043c \u0434\u043b\u044f \u043a\u043e\u043c\u043c\u0435\u0440\u0447\u0435\u0441\u043a\u0438\u0445 \u0437\u0434\u0430\u043d\u0438\u0439, \u0432 \u0442\u043e \u0432\u0440\u0435\u043c\u044f \u043a\u0430\u043a \u0441\u0440\u0435\u0434\u043d\u0435\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u0434\u043b\u044f \u043f\u043e\u0434\u0441\u0442\u0430\u043d\u0446\u0438\u0439 \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 1 \u043e\u043c \u0438 \u043c\u0435\u043d\u044c\u0448\u0435. \u042d\u0442\u043e \u043d\u0435 \u0442\u0440\u0435\u0431\u043e\u0432\u0430\u043d\u0438\u0435 NEC, \u043d\u043e \u044d\u0442\u043e \u043b\u0443\u0447\u0448\u0438\u0435 \u043f\u0440\u0430\u043a\u0442\u0438\u043a\u0438, \u043a\u043e\u0442\u043e\u0440\u044b\u043c \u0441\u043b\u0435\u0434\u0443\u044e\u0442 \u043c\u043d\u043e\u0433\u0438\u0435 \u043f\u0440\u043e\u0435\u043a\u0442\u0438\u0440\u043e\u0432\u0449\u0438\u043a\u0438 \u0438 \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043f\u043e\u0434\u043b\u0435\u0436\u0430\u0442 \u0442\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044e.<\/p>\n<h2>\u0421\u0443\u0449\u0435\u0441\u0442\u0432\u0443\u0435\u0442 \u043b\u0438 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u044b\u0439 \u0434\u0438\u0430\u043f\u0430\u0437\u043e\u043d? \u041f\u043e\u043d\u0438\u043c\u0430\u043d\u0438\u0435 \u0447\u0438\u0441\u0435\u043b<\/h2>\n<p>Here&#8217;s how to interpret ground resistance readings in practice:<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3703\" src=\"https:\/\/huyuglobal.com\/wp-content\/uploads\/2026\/08\/Is-There-a-Safe-Range.webp\" alt=\"\u0421\u0443\u0449\u0435\u0441\u0442\u0432\u0443\u0435\u0442 \u043b\u0438 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u044b\u0439 \u0434\u0438\u0430\u043f\u0430\u0437\u043e\u043d? \u041f\u043e\u043d\u0438\u043c\u0430\u043d\u0438\u0435 \u0447\u0438\u0441\u0435\u043b\" width=\"1448\" height=\"1086\" \/><\/p>\n<table>\n<thead>\n<tr>\n<th>Resistance<\/th>\n<th>Interpretation<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>&lt; 1 ohm<\/td>\n<td>Excellent \u2014 typical of large grids, substations, high-density electrodes<\/td>\n<\/tr>\n<tr>\n<td>1\u20135 \u041e\u043c<\/td>\n<td>Good \u2014 the recommended range for commercial\/industrial (IEEE 142)<\/td>\n<\/tr>\n<tr>\n<td>5\u201310 ohms<\/td>\n<td>Acceptable for many installations, but worth improving for sensitive loads<\/td>\n<\/tr>\n<tr>\n<td>10\u201325 ohms<\/td>\n<td>Meets the NEC single-electrode threshold but marginal for commercial electronics; investigate<\/td>\n<\/tr>\n<tr>\n<td>25\u2013100 ohms<\/td>\n<td>Poor \u2014 above the NEC single-electrode limit; likely needs multiple electrodes or treatment<\/td>\n<\/tr>\n<tr>\n<td>&gt; 100 ohms<\/td>\n<td>Very poor \u2014 unacceptable for any permanent installation; rework required<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The key warning is as follows: there is not one universal &#8220;safe&#8221; value that applies to each situation from a safety perspective \u2014 it is also influenced by different factors such as earth fault current, soil conditions and the actual circuit. The quality of electrode grounding resistance is only a part of the problem; the integrity of the whole grounding system is just as important. A perfect electrode of 2 Ohm is useless if the ground conductors of the devices are crooked or corroded.<\/p>\n<h2 id=\"is-20-ohms\">Is 20 Ohms Bad? Interpreting Your Measurement<\/h2>\n<p>20-ohm resistance levels are not viewed positively in the commercial building construction code, but there are also no code violations associated with that value, hence:<\/p>\n<ul>\n<li>NEC standard: This level is less than the maximum single-electrode value determined by the above legislation. Nevertheless, 20-ohm resistance level is still close to exceeding the standards, depending on the seasonal increase and decline of moisture level in the soil.<\/li>\n<li>IEEE 142 standard: Based on this standard, the resistance level of 20 ohm exceeds the recommended value of 1-5 ohm, meaning that some of the electronic equipment, such as those preventing surge operations, might be damaged because of the improper grounding level.<\/li>\n<\/ul>\n<p>In practical terms, any commercial organization will make sure the grounding meets the set standards.<\/p>\n<p>Conclusion: Generally speaking, 20 ohm of resistance may not threaten the life of the building, but it is still too high for a commercial building; therefore, it needs to be improved.<\/p>\n<h2>Other Commercial Requirements: Receptacles &amp; Bonding<\/h2>\n<p>The ground resistance is a part of commercial electrical safety. The National Electrical Code (NEC) requirements are as follows:<\/p>\n<ul>\n<li>The characteristics of commercial receptacles (NEC 406, 210.52, 210.8): The commercial receptacles shall be specified to be 125V,15A and\/or 20A types, GFCI protection is necessary to be provided at certain locations (bathrooms, rooftops, kitchens, outdoor locations etc. per 210.8(B)), all the receptacles will be connected to the metal box and each receptacle shall be ensured to be connected to the grounding conductor.<\/li>\n<li>Bonding process (NEC 250.102-250.104): It is essential to understand that all the metallic parts which can become energized like piping, framed equipment, structural steel, pumping equipment must be bonded to the grounding system. It&#8217;s worth noting that bonding continuity testing will be carried out separately from electrode resistance (point-to-point resistance should not exceed 0.5 ohm when equipment is connected to the grounding system).<\/li>\n<li>Grounding electrode conductor (NEC 250.66): The grounding electrodes must be sized according to the service doesn&#8217;t exceed the maximum diameter and should connect the grounding system to the service equipment.<\/li>\n<\/ul>\n<p>If you&#8217;re also verifying the protective devices on the circuit, our explanation of <a href=\"https:\/\/huyuglobal.com\/ru\/blog\/circuit-breaker-and-ground-fault-circuit-interrupter\/\" rel=\"nofollow\">circuit breakers vs ground-fault circuit interrupters<\/a> clarifies which protection does what in a commercial panel.<\/p>\n<h2>What Counts as High Electrical Resistance?<\/h2>\n<p>Context plays a role in what &#8220;high resistance&#8221; means:<\/p>\n<ul>\n<li>When measuring grounding electrodes, it means greater than about 25 ohms (for instance, 100 ohms or greater is a very high value). The &#8220;ideal&#8221; resistance level is 1-5 ohms.<\/li>\n<li>In terms of continuity of grounding, anything more than 0.5 ohm indicates a fault. The connection between equipment and ground should be almost zero.<\/li>\n<li>With respect to insulation resistance, a high resistance value means a good resistance since it is measured in mega and gigohms where anything below 1 M\u03a9 indicates a high probability for a breakdown.<\/li>\n<\/ul>\n<p>In conclusion, &#8220;high resistance&#8221; almost always means a problem (for grounding) but it can mean a good situation (for insulation). Always make sure what exactly one is talking about when using a term &#8220;high resistance&#8221;.<\/p>\n<h2>Factors That Affect Ground Resistance<\/h2>\n<p>Ground resistance is not a constant value. It varies with circumstances:<\/p>\n<ul>\n<li>Soil resistivity: Clay\/loam (10\u2013100 \u03a9\u00b7m) has lower resistivity than sand\/gravel (1,000\u201310,000 \u03a9\u00b7m).<\/li>\n<li>Moisture content: Wet soils have lower resistivity while dry weather increases resistance enormously.<\/li>\n<li>Temperature: Cold soil has much higher resistivity.<\/li>\n<li>Electrode depth and cross section: Longer electrodes and bigger plates go deeper into soil.<\/li>\n<li>Number of and separation between electrodes: The more electrodes you have and the farther apart they are, the lower the resistance will be.<\/li>\n<li>Electrode material and corrosion: The longer the electrodes stay in the ground, the more corrosion there is, and resistance will increase.<\/li>\n<\/ul>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3704\" src=\"https:\/\/huyuglobal.com\/wp-content\/uploads\/2026\/08\/How-to-Achieve-a-Low-Resistance-Ground.webp\" alt=\"How to Achieve a Low-Resistance Ground\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2>How to Achieve a Low-Resistance Ground<\/h2>\n<p>In case your commercial grounding is excessively high, here\u2019s a ranked list of the most cost-effective solutions:<\/p>\n<ul>\n<li>Add rods: Adding a second ground rod, placed 8 feet away from the first, will greatly reduce the resistance. Continue adding additional rods until the correct resistance is achieved (the benefit generated decreases with each added rod).<\/li>\n<li>Use larger or longer rods: Using a longer rod (10-foot) or thick rods or plate electrodes will help reach deeper and less resistant soils.<\/li>\n<li>Improve soil connection: Backfilling conductive materials or chemical additives around the rod will improve its connection with the soil.<\/li>\n<li>Create ground rings or grid: Underground copper conductor encircling the structure creates a bigger area of connection (this solution is widely used in commercial\/industrial field).<\/li>\n<li>Use concrete-encased electrodes (Ufer grounds): Concrete-embedded rebar and conductor show excellent and reliable conduction properties.<\/li>\n<li>Connect to the building&#8217;s steel parts and water pipe: Connecting to the metal structural steel and underground water pipes (if any) gives additional ways of conduction.<\/li>\n<\/ul>\n<p>Be sure to test every time you change the system, but keep in mind that the NEC does not require retesting the two-electrode system.<\/p>\n<h2>How Ground Resistance Is Tested<\/h2>\n<p>Ground testing is to be carried out by persons qualified for this job. The main and widespread methods are:<\/p>\n<ul>\n<li>Fall-of-Potential (more commonly known as three-point testing): The fall-of-potential method consists in the use of two temporary stakes and resistance measuring with increasing distance. It is the most precise technique used for small to medium installations.<\/li>\n<li>Clamp-on (or inductive) testing: The clamp-on method involves the clamp around the rod\/conductor so that the loop resistance can be measured without disconnecting the loop. It is advantageous for the already existing installations but requires the whole loop connected.<\/li>\n<li>Two-point testing: The two-point method is used to make fast measurements against a known reference electrode: this technique is less accurate, thus used in rough calculations.<\/li>\n<\/ul>\n<p>Testing is dangerous, since it usually requires isolation of the electrode, and fault current may be present, this job should not be done by an ordinary homeowner. For commercial buildings the commissioning and regular tests usually are performed by contractors or specialized companies in accordance with NETA standards.<\/p>\n<h2>\u0427\u0430\u0441\u0442\u043e \u0437\u0430\u0434\u0430\u0432\u0430\u0435\u043c\u044b\u0435 \u0432\u043e\u043f\u0440\u043e\u0441\u044b<\/h2>\n<h3>Which guideline outlines the acceptable maximum resistance for earthing in commercial installations?<\/h3>\n<p>NEC does not specify a single standard maximum value. The 25-ohm requirement outlined in NEC 250.53 applies only to the case of a single-electrode system, and not to the whole building. A major engineering standard is IEEE Std 142 (the Green Book), which suggests that the value of the main grounding electrode in large commercial and industrial installations should be in the range of 1-5 ohms. Normally, in practice, and accepting standards set by NETA, the value of 5 ohms is satisfactory for a commercial building (1 ohm for a substation). In general, NEC shows the limit according to the requirements of the code, IEEE 142 provides the acceptable range according to the engineering requirements, and then 5 ohms emerges as the accepted practice.<\/p>\n<h3>Is 20 ohms of resistance in a ground bad?<\/h3>\n<p>A resistance of 20 ohms is not hazardous in itself but is borderline acceptable for commercial buildings. While the NEC&#8217;s single-rod criterion of 25 ohms is passed, the number is above the level recommended by IEEE 142 for commercial installations, which is 1\uff0d5 ohms, as well as the commonly accepted level of 5 ohms. With that level of grounding, the fault current is returning in a slower manner and not providing remarkable surge protection or reference grounding for sensitive electronics as well. And since it is just a step away from going above the code threshold, the level may go up as a result of soil condition changes during the seasons. Hence, the grounding system should be improved in the case of commercial installations.<\/p>\n<h3>What are the NEC commercial receptacle requirements?<\/h3>\n<p>All commercial receptacles have a voltage rating of 125 volts to 15 or 20 amps as stated in NEC 406, and their minimum amount and spacing rules can be found in 210.52 for general areas. GFCI protection is mandatory in given commercial spaces under NEC 210.8(b), such as bathrooms, kitchens, rooftops, outdoors, and garages\/service areas. All receptacles must be provided with an equipment grounding, and metallic boxes are to be grounded. In many commercial child-occupied places, tamper-resistant receptacles are a must, while some types of occupancies have their particular rules for provided receptacles.<\/p>\n<h3>What is a high electrical resistance?<\/h3>\n<p>&#8220;High electrical resistance&#8221; depends upon what measurement is at hand. With regard to grounding electrodes, anything over approximately 25 ohms counts as high, while numbers over 100 ohms are considered very high. Ideally, the resistance should be somewhere between 1 and 5 ohms. Concerning equipment grounding continuity, the electrical resistance should not exceed 0.5 ohm when measuring the equipment and the ground. In insulation, a high resistance is a positive sign. For insulation to be considered healthy, it must have a resistance of millions of ohms (M\u03a9) or even billions of ohms. A resistance level of less than 1 M\u03a9 indicates a breakdown with leakage danger.<\/p>\n<h2>\u0421\u0441\u044b\u043b\u043a\u0438<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.nfpa.org\/codes-and-standards\/all-codes-and-standards\/list-of-codes-and-standards\/detail?code=70\" rel=\"nofollow noopener\" target=\"_blank\">NFPA 70 \u2014 National Electrical Code (NEC), Article 250 (Grounding &amp; Bonding), 210.8, 406<\/a><\/li>\n<li><a href=\"https:\/\/standards.ieee.org\/ieee\/142\/4070\/\" rel=\"nofollow noopener\" target=\"_blank\">IEEE Std 142-2007 \u2014 Recommended Practice for Grounding of Industrial and Commercial Power Systems (Green Book)<\/a><\/li>\n<li><a href=\"https:\/\/standards.ieee.org\/ieee\/81\/4395\/\" rel=\"nofollow noopener\" target=\"_blank\">IEEE Std 81 \u2014 Guide for Measuring Earth Resistivity, Ground Impedance, and Earth Surface Potentials<\/a><\/li>\n<li><a href=\"https:\/\/www.netaworld.org\" rel=\"nofollow noopener\" target=\"_blank\">NETA \u2014 Acceptance Testing Specifications (ATS) for electrical power equipment<\/a><\/li>\n<li><a href=\"https:\/\/www.vertiv.com\/4990c7\/globalassets\/shared\/why-test-grounding-systems.pdf\" rel=\"nofollow noopener\" target=\"_blank\">Vertiv \u2014 Why Test Grounding Systems (NEC\/IEEE 142\/80 grounding values)<\/a><\/li>\n<li><a href=\"https:\/\/www.fluke.com\" rel=\"nofollow noopener\" target=\"_blank\">Fluke \u2014 Ground resistance testing application notes<\/a><\/li>\n<\/ul>\n<h2>\u0417\u0430\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435<\/h2>\n<p>The NEC&#8217;s two figures \u2014 25 ohms and 1-5 ohms as per the IEEE 142 guide cover the maximum allowed electrical ground resistance of a commercial building. While the NEC does not consider for a commercial building the value of under 25 ohms that would indicate compliance with the code as a performance standard, it depends on whether a single electrode is sufficient. From this standpoint, the ideal value for reliable and safe performance of commercial installation would be in the range of 1-5 ohms, as noted by IEEE, thus facilitating fast failure elimination, effective surge protection, low noise level for commercial electronics.<\/p>\n<p>Use proper fall-of-potential testing to get a good measurement and tally it against the range table (as good value is under 5, value ranging from 5 to 25 is marginal, value over 25 is below the acceptable level); you may need to add more or longer electrodes to the grounding system unless you find the readings satisfactory. Finally, do not forget that the resistance of electrodes is only half of the story and the continuity of bonding and grounding must also be accounted for.<\/p>","protected":false},"excerpt":{"rendered":"<p>A person comes to perform electrical inspection in your commercial building. The engineer informs him that the ground electrode was tested at 22 Ohms. Someone nearby says that since NEC permits 25 Ohms, everything is okay. But the equipment manufacturer&#8217;s handbook states that 5 Ohm max is needed since it works with sensitive electronics; therefore, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3701,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_gspb_post_css":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-3700","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blogs"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/huyuglobal.com\/ru\/wp-json\/wp\/v2\/posts\/3700","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/huyuglobal.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/huyuglobal.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/huyuglobal.com\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/huyuglobal.com\/ru\/wp-json\/wp\/v2\/comments?post=3700"}],"version-history":[{"count":2,"href":"https:\/\/huyuglobal.com\/ru\/wp-json\/wp\/v2\/posts\/3700\/revisions"}],"predecessor-version":[{"id":3706,"href":"https:\/\/huyuglobal.com\/ru\/wp-json\/wp\/v2\/posts\/3700\/revisions\/3706"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/huyuglobal.com\/ru\/wp-json\/wp\/v2\/media\/3701"}],"wp:attachment":[{"href":"https:\/\/huyuglobal.com\/ru\/wp-json\/wp\/v2\/media?parent=3700"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/huyuglobal.com\/ru\/wp-json\/wp\/v2\/categories?post=3700"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/huyuglobal.com\/ru\/wp-json\/wp\/v2\/tags?post=3700"}],"curies":[{"name":"\u0432\u043f","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}