Specifications and Calculations of Copper Busbars for Enclosed Bus Ducts

The larger the cross-section of the conductive copper bar in a closed busway, the smaller the power loss, but the line investment, maintenance and management, and non-ferrous metal consumption will also increase accordingly. Therefore, when designing and selecting a closed busway, it is necessary to choose a reasonable specification of the closed busway from an economic point of view, which can not only reduce the power loss of the line, but also will not increase the line investment.  , maintenance management and non-ferrous metal consumption.

Busway copper bar specifications

1. Busway CFW Serial Number Current Range Copper Bar Specification 1 4000A 2*(150*8) 2 3150A 200*8 3 2500A 185*8 4 2000A 160*6 5 1600A 150*6 6 1250A 100*6 7 1000A 80*6 8 800A 60*6 9 630A 50*6 

2. Copper-aluminum composite busway KFM 1 4000A 2*(100*10) 2 3150A 230*8 3 2500A 125*10 4 2000A 160*6 5 1600A 100*8 6 1250A 100*6 7 1000A 80*6 800A 60*6 9 630A 50*6 10 400A 40*6 11 200A 30*4 

3. Intensive busway CCX 1 3150A 250*6 2 2500A 205*6 3 2300A 165*6 4 2000A 130*6 5 1600A 110*6 6 1350A 100*6 7 1250A 80*6 8 1000A 60*6 9 800A 45*6 10 600A 35*6 11 500A 35*6 12 400A 30*6 13 315A 25*6 14 250A 25*5 15 200A 25*4 16 100A 25<

Low-voltage power lines and distribution lines are usually split or trunk types. In high-rise buildings and large public facilities, it is recommended that the design of power supply lines should be radial, while the design of distribution lines should be based on tree trunks. The power distribution lines designed in this way reduce investment and economical use, and their conduction points do not affect each other in the event of a fault, and the power supply is safe and reliable.

The closed busway should be laid in the electrical shaft with strong electricity, and the electrical shaft should be close to the center of the electricity load in the building, so as to minimize the length of the trunk line and save construction investment. Electrical shafts should not share a shaft with elevators, pipelines, etc., and avoid being close to heat pipelines and diesel generator exhaust pipelines. The formula for calculating the current of a closed busway: Ic=Pc/3UNCOSφ, where Pc=KdPe.　 Kd - need coefficient PE - equipment capacity of the electrical equipment group PC - calculated load of the electrical equipment group UN - rated voltage of the electrical equipment group COSφ - average power factor of the electrical equipment group The selected closed busway should meet the inequality: Ie≥Ic, otherwise it needs to be recalculated and corrected. IE – Allowable ampacity of the closed busway (see current rating shown in Table 1) Ic – Calculated current of the closed busway

In actual work, we can use experience to choose the specification of the closed busway, generally "the allowable ampacity value of the closed busway is twice the calculated load value". For example, Pc=500KW, you can choose a 1000A closed busway.