2009年10月4日 · Under the 2008 code the EGC is no longer sized by the overload rating, but is based on the maximum size dual element fuse that is permitted for the motor. Note that 250.122 (A) does apply and the EGC is never required to be larger than the motor circuit conductors.

2024年4月15日 · The EGC limits aboveground potential (voltages) on conductors and equipment enclosures during normal operation and abnormal conditions, such as a ground-fault or short-circuit event. Another important EGC function is bonding, as indicated in the informational note following its definition.

2010年3月7日 · When sizing equipment ground for a motor and the overcurrent device is much higher than the conductor rating, so the equipment ground size from Table 250.122 is actually more than motor conductor size. The exception say's E.G.C doesn't have to …

Table 250.122 — Grounding Conductor Size Minimum Size Equipment Grounding Conductors for Grounding Raceway and Equipment

EGCs for motors You must size EGCs for motor circuits per 250.122 (D) (1) or (D) (2). For motor circuits, follow 250.122 (D) (1). The EGC must not be smaller than determined by 250.122 (A), based on the rating of the motor circuit branch-circuit short-circuit and ground-fault protective device sized per 430.52 (C) (1) Ex 1.

2021年5月13日 · But after you pointing it out it still makes sense no matter what, the EGC is to be sized off of the OCPD size to be proportional and matching it. Being it’s main function is to have a low enough low-impedance path to operate the SC/GF device and clear the fault.

The equipment grounding conductor (EGC) serves as part of the effective ground-fault current path [Article 100]. The effective ground-fault current path [Article 100] is an intentionally constructed low-impedance conductive path designed to carry fault current from the point of a ground fault on a wiring system to the electrical supply source.

Motor Branch Circuit Conductor, OCPD, and EGC Calculator, Mobile Type of Motor

What size short circuit/ground fault protection is required for the branch circuit serving motor #1 in motor diagram #1? We are looking for the smallest fuse or circuit breaker required to protect …

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.