I. Overview of the Project:
This project is located at 6 Street /8 Road, Tiexi New District Development Zone; Superstar welding equipment factory project. The building area is square meters, and the structural form is a combination of concrete frame structure and steel structure.
The project recently used electricity to power its own diesel generator; Long-term power supply of three-phase five-wire power system (TN-S) provided by the project owner.
Second, the line direction, load distribution and the location of the electric box
1. According to the arrangement of electrical equipment on the construction site, power and lighting are separated, and four trunk lines (rubber sheathed cables) are separated from the primary electrical box, which are led to the secondary distribution box of overhead buried pipes, and then led to the switch box of electrical equipment by the distribution box.
(1) the power supply ① is output by the primary electrical box, and the load on the line consists of 1 gantry hoist (7.5KW), 2 mixers (5.5 kw× 2 = 1 kw) and1welder (26× 0).
(2) The power supply ② is supplied to the rebar processing operation area by the output of the primary electrical box, and the line loads are 1 rebar bender (4.5KW), 1 rebar cutter (4.5KW), 1 rebar straightener (4.5KW) and 1 welder (26KW).
(3) Power supply (3) The output of the primary electric box supplies power to the woodworking operation area, and the load on the line consists of two chainsaws (3.0×2=6KW).
(4) The lighting power supply is separated from the primary electrical box and led to the secondary distribution box before output, with a capacity of 15 KW. Lighting power supply and power supply are not separated, that is, lighting power supply and power supply do not affect each other.
(5) According to Technical Specification for Temporary Electricity Safety in Construction Site, this power supply adopts three-phase five-wire system (TN-S) and three-level leakage protection system.
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