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 ...

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.,

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.

A single nonmetallic raceway or cable tray, you must install a single wire-type EGC (sized per Table 250.122 based on the rating of the circuit overcurrent protective device) with the parallel circuit conductors [250.122(F)(1)(a)].

Where the overcurrent device is an instantaneous-trip circuit breaker or a motor short circuit protector, the equipment grounding conductor (EGC) shall be sized from Table 250.122 using the maximum permitted rating of a dual element time-delay fuse selected for branch-circuit short-circuit and ground-fault protection in accordance with 430.52(C ...

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.

Ground Wire Size Table Source: NFPA 70, National Electrical Code, Table 250-95 Rating or Setting of Automatic Overcurrent Device in Circuit Ahead of Equipment, Conduit, etc.