How to choose the busbar size when installing the power electrical cabinet?
1. Selection of Main busbar
At present, the main busbar specifications of most electrical engineering projects are specified by the design institute and users.
If the project is not specified, the type can be selected according to the table below.
| copper Main bus bar | |
| Main bus rated current | Main busbar size |
| 630A | TMY-60*6 |
| 800A~1250A | TMY-80*8 |
| TMY-80*10 | |
| 1600A | TMY-100*10 |
| 2000A | TMY-2 * 100*8 |
| TMY-2 * 80*10 | |
| 2500A | TMY-2 * 100*10 |
| 3150A | TMY-2 * 125*10 |
| 4000A | TMY-2 * 100*10 |
2. Selection of the branch busbar
The specifications of the supporting busbars of the incoming cabinet, the bus-connected switchgear and the bus-coupled isolation cabinet shall be the same as the main busbar, and the other cabinet types (such as feeder cabinets, busbar equipment cabinets, etc.) shall be selected according to the rated current of this cabinet.
The rated current of the cabinet is taken from the minimum value of the rated current of the primary components of the cabinet.
| rated current | branch busbar size |
| ≤630A | TMY-40*6 |
| 800A | TMY-60*6 |
| 1250A | TMY-80*6 |
| TMY-2*60*6 | |
| 1600A | TMY- 80*10 |
| TMY-2*60*8 |
3. Selection of grounding busbar
The primary grounding busbar is standard TMY-40 * 6, and the secondary grounding busbar is TMY-20 * 6.
The secondary grounding penetrating row is the marked configuration of the State Grid Engineering Project.
If the user engineering project has no special instructions, no configuration is required.