1.1 According to the number of suspension rows, it is divided into: single row, double row and multi-row suspension system

1.2 According to the clock direction, it is divided into: 12 o'clock (single row), 2 o'clock and 10 o'clock, 3 o'clock and 9 o'clock (double row)

2、Bracket form

2.1 Tripod bracket

2.2 Straight pole bracket

2.3 wall bracket

2.4 Fixed tripod on steel roof truss

3.Inlet way

4.Inlet reservation and connection methods

5.Special-shaped parts and their installation methods

5.1 General special-shaped parts 

5.2 Functional special-shaped parts