NEC Table 250.122: Minimum Size Equipment Grounding Conductors for Grounding Raceway and Equipment

2021年3月2日 · Equipment Grounding Conductor (EGC): Table 250.122 The EGC of a branch circuit bonds the noncurrent-carrying metal parts of a connected load back to the grounded metal parts of the electrical distribution panel where the circuit originates. This EGC can be a wire-type or it can be in another form such as an approved metal conduit.

The equipment grounding conductor in a flexible cord with a circuit conductor larger than 10 AWG shall be sized in accordance with Table 250.122.

The National Electric Code (NEC), specifically NEC 250.122, provides essential guidelines for determining the proper size of equipment grounding conductors (EGC) in electrical installations. The grounding conductors play a critical role in maintaining safety by directing fault currents safely back to the source, protecting both personnel and ...

2023年9月3日 · Learn how to size equipment grounding conductors. National Electrical Code (NEC) Section 250.122 rules the sizing of equipment grounding conductors. Table 250.122 displays the minimum conductor size for grounding raceways and equipment based on the ampere rating or setting of the circuit’s overcurrent protective device.

An equipment grounding conductor (EGC) is sized differently than a grounding electrode conductor (GEC). EGC’s are sized from Table 250.122 based on the size of the overcurrent device ahead of the circuit. The GEC is sized from Table 250.66 based on the size of the ungrounded service entrance conductors.

Table 250.122 Minimum Size Equipment Grounding Conductors for Grounding Raceway and Equipment Rating or Setting of Automatic Overcurrent Device in Circuit Ahead of Equipment, Conduit, etc.,

According to the definition in Article 100, an Equipment Grounding Conductor (EGC) is the conductive path(s) that provides a ground-fault current path and connects normally non–current-carrying metal parts of equipment together and to the system grounded conductor or to the grounding electrode conductor, or both.

2023年2月15日 · The minimum size wire-type EGC for a 400A feeder is normally a 3 AWG copper, according to Table 250.122. The circular mil value of a 3 AWG conductor is 52,620 circular mils, as provided in NEC Table 8, Chapter 9.

2025年2月14日 · The 4 AWG size for the wire-type EGC in the cable is based on Table 250.122 using a 300A rating for an OCPD. However, if four of these cables are installed in parallel to provide a 1,000A feeder circuit, a 4 AWG conductor is not sufficient to provide the EGC in accordance with Table 250.122. A properly sized wire-type EGC in accordance with ...