Protective conductor for the rising mains smaller than 70 sq . mm 上升总线的保护导体小于70平方毫米铜或其等值。
2.
Electrical rising main system 垂直电力总线系统
3.
Rising mains undersized when compared to the ratings of the protective device 与保护器件的额定值比较，上升总线尺寸过小。
4.
3 - phase 4 - wire lateral main tee - off from rising mains not provided at each floor 并无在每一层楼从上升总线引出三相四线的横向总线。
5.
Wet rising main 湿式竖管
6.
Water direct from the rising main is rarely used . the supply usually comes from a storage tank which creates an increased risk of contamination as the water has been standing and is usually not sufficiently chlorinated 直接来自自来水管的水很少使用，通常供水来自于贮藏槽，由此污染风险增加，因为水经过放置，且通常未充分氯化消毒。
