Cable Trunkings

To comply with wiring regulations, the installer shall ensure that the trunking is not overfilled and acceptable pressure is applied to the cables.
In order to do this, the installer shall not exceed the 45% space factor given in the rigs.
The 45% space factor means that the total cross-sectional area of all cables shall not be greater than 45% of the cross-sectional area of the trunking.