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【매일 주제】【전기판 20160904】

2016-09-04View Original

Thread Content

참여 보상: 2재산.정답에 대한 보상: 9재산. 전자계산기실의 저전압 배전 시스템에서는 주파수가 50Hz이고 전압이 220/380V인 ( )형태의 접지 방식을 사용해야 합니다.  A. IT  B. TN-S  C. TN-C  D. TN-C-S 정답: BD
Reply #22016-09-04
전자컴퓨터실의 저전압 배전 시스템은 주파수 50Hz, 전압 220/380V인 (BD) 시스템 접지 방식을 채택해야 한다.   A. IT   B. TN-S   C. TN-C   D. TN-C-S
Reply #32016-09-04
B.TN-S    D.TN-C-S
Reply #42016-09-04
B.TN-S;D.TN-C-S
Reply #52016-09-05
전자컴퓨터실의 저전압 배전 시스템은 주파수 50Hz, 전압 220/380V인 (B,D)형 접지 방식을 채택해야 한다.   A. IT   B. TN-S   C. TN-C   D. TN-C-S

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