標準號：SIS SS-EN 60 439-4-1991
中文標準名稱：低壓成套開關設備和控制設備組件．第4部分：施工現場的安裝特殊要求（ACS）
英文標準名稱：Low-voltage switchgear and controlgear assemblies — Part 4: Particular requirements for assemblies for construction sites (ACS)
發布日期：1991/12/4 12:00:00
實施日期：1999/12/31 12:00:00
適用范圍：Replace the last three paragraphs by the following:This standard applies to type-tested assemblies (TTA) intended for use on construction sites, i.e. temporary places of work to which the public do not generally have access and where building construction, installation, repairs, alteration or demolition of property (buildings) or civil engineering (public works) or excavation or any other similar operations are carried out. These assemblies may be transportable (semi-fixed) or mobile.This standard does not apply to assemblies for use in the administrative centres of construction sites (offices, cloakrooms, assembly rooms, canteens, restaurants, dormitories, toilets, etc).NOTE - As regards the transformers incorporated in an ACS, it should be noted that both the nominal primary voltage and the nominal secondary voltage must be within the limits specified in IEC 439-1 for this standard to be applicable.