Equipment Grounding Conductor Size

The National Electric Code (NEC) defines the Equipment Grounding Conductor (EGC) as the conductive path or paths that provides a route for ground-fault current. This connects any non-current carrying metal parts of equipment together and to the system ground conductor or to the ground electrode conductor or both.

Grounding and Bonding is discussed in Article 250 and the sizing of equipment grounding conductors in 250.122. The calculation is based on Table 250.122 which defines the minimum size equipment grounding conductor necessary.

The National Electric Code (NEC) specifies the minimum size for cable tray systems which includes ladder, ventilated trough, ventilated channel, solid bottom and other similar structures. It’s important to note that cable trays are mechanical support systems and not raceways. Raceways are included in another section of the code.

Proper cable tray sizing is complicated and often existing cable trays are overloaded per the code. If you have questions or would like some engineering assistance to properly size your cable tray installation please contact us.