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4、, V , V , V . (KS B 5254 1 ) KS B 5236 3 V V , V , V . KS B 5236 (KS B 5254 1 ) 4 V 45 , V , V , 1/2 . (KS B 5236) (KS B 5254 1 ) 5 V V , V , V . (KS B 5236) (KS B 5254 1 ) KS B 5245:2009 5 4 ( ) 6 1 V V V , V , h . , 2 . (KS B 5236) (KS B 5254 1 ) 11 V , , , , 6.( ) 7.( ) 8.( ) 9.( ) . 12 V , , . , 1 1 . KS B 5245 50 1 V 150 2 1 13 2 V a), b), c), d) . a) b) c) (1 A, B .) d) 2 a) b) c) d) V 153787 1 92 3 (13 ) (02)26240114 (02)262401489 http:/ KS B 5245:2009 KSKSKS SKSKS KSKS SKS KS SKS KSKS SKSKS KSKSKS V blocks ICS 17.040.30 Korean Agency for Technology and Standards http:/www.kats.go.kr