1、三级电箱与二级电箱连接。三级电箱需要保证“一箱一机一开关一漏电”，一个漏电保护器下只能接两个电机和插座。总的来说，三等电箱机动性高，机动性强，要固定好位置，接地。施工现场用电需要严格按照施工现场临时用电规范执行，并采用TN-S零保护系统。

1. Connect the third level electrical box to the second level electrical box. The three-level electrical box needs to ensure "one box, one machine, one switch, and one leakage", and only two motors and sockets can be connected under one leakage protector. Overall, third class electrical boxes have high maneuverability and strong mobility, and need to be fixed in place and grounded. The power supply at the construction site must strictly follow the temporary power supply regulations and adopt the TN-S zero protection system.

2、二次电源箱与一次电源箱连接，需要放置在施工现场的规划位置，不得随意移动。外面有临时电源防护棚。二次配电箱防护棚体由2.4米1.96米高的防护栏杆组成。外侧长30毫米、厚2.5毫米的方管应与内侧长25毫米、厚2毫米的方管焊接。天蓬屋顶由500mm(高)2420mm(宽)左右的特殊框架拼接而成?？蚣苡杀叱?0毫米、厚2.5毫米的方形矩形管焊接而成.延伸支架由边长为25毫米、厚度为2毫米的方形矩形管组成。从每侧伸出的脚手架(25毫米2毫米)分别插入棚体的立杆(30毫米2.5毫米)。防护棚主机架焊接40mm40mm矩形管。棚体矩形方管间距15cm，总高2.8m，宽1.5-2m。防护棚正面设有大门。

2. The secondary power box should be connected to the primary power box and placed in a planned location on the construction site, and should not be moved arbitrarily. There is a temporary power protection shed outside. The protective shed of the secondary distribution box is composed of 2.4-1.96 meter high protective railings. A square tube with an outer length of 30 millimeters and a thickness of 2.5 millimeters should be welded to a square tube with an inner length of 25 millimeters and a thickness of 2 millimeters. The canopy roof is made up of special frames that are approximately 500mm (height) and 2420mm (width) spliced together. The frame is welded from square rectangular tubes with a side length of 30 millimeters and a thickness of 2.5 millimeters. The extension bracket is composed of square rectangular tubes with a side length of 25 millimeters and a thickness of 2 millimeters. The scaffolding extending from each side (25mm, 2mm) is inserted into the vertical poles of the shed (30mm, 2.5mm). Welding of 40mm and 40mm rectangular pipes on the main frame of the protective shed. The spacing between the rectangular square tubes of the shed is 15cm, with a total height of 2.8m and a width of 1.5-2m. The front of the protective shed is equipped with a gate.

3、配电箱防护棚底部设置两层?；?，防止雨淋和碰伤。防护棚正面悬挂操作说明牌和安全警示标语，帽上设置施工企业标志。栅栏上涂有红、白(黄、黑)警示漆，起到警示作用，达到防腐耐用的目的。防护棚不仅可用于配电箱，还可用于加固施工现场，如坠落区、木工下料区、一楼电梯出入口、搅拌机等。

3. Two layers of protection are installed at the bottom of the distribution box protective shed to prevent rain and damage. Hang operation instructions and safety warning signs on the front of the protective shed, and set up the construction company logo on the hat. The fence is coated with red and white (yellow, black) warning paint to serve as a warning and achieve the purpose of anti-corrosion and durability. The protective shed can not only be used for distribution boxes, but also for reinforcing construction sites, such as falling areas, woodworking cutting areas, first floor elevator entrances and exits, mixers, etc.