Ocpd electrical definition

Article 2provides the requirements for selecting and installing overcurrent protection devices ( OCPDs ). Depending on your application, other Articles may apply (see Other Articles on page 54). An overcurrent exists when current exceeds the rating of conductors or equipment. It can result from overloa short circuit, . Transformer secondary conductors.

The NEC defines such circuits as that portion of the wiring system between the load side of the overcurrent protection device ( OCPD ) or the power-limited supply and all .

Article 4provides the requirements for electric motors while Art.

An OCPD protects equipment by opening when it detects an overloa short- circuit or ground fault. The application of Series Rated OCPD continues to be one of the most popular and unfortunately most abused methods of. Series ratings are defined as: A short-circuit interrupting (AIC) rating . Two categories of devices are acknowledged by the NEC as overcurrent protective devices ( OCPDs ): circuit breakers and fuses. A proper voltage rating of the OCPD is essential for interrupting the circuit.

These overcurrent protective devices ( OCPDs ) are typically used in main service disconnects, feeders and branch circuits of residential, commercial, institutional, and industrial electrical systems. There are other OCPDs use such as relays and supplementary OCPDs , which this article does not directly . But in this arrangement, the OCPD is sized for the feeder conductor and is thus oversized for that tap conductor (not sized per 24). In addition, you must provide an overcurrent protection device ( OCPD ) in each ungrounded circuit conductor at the point where the conductors receive their supply (241). Article 4provides details for sizing branch circuit overcurrent protective devices ( OCPDs ), branch circuit conductors, and motor overload protection.

The overcurrent protection device ( OCPD ) must accommodate inrush current while still protecting the conductors. The meaning of this emerges in 430. This rule states that an OCPD can be loaded to only of its rating for continuous loads. A key point to remember about branch circuits is that the overcurrent protection device ( OCPD ) defines the circuit.

Thus, the rating of the OCPD determines the . B) for any transformer secondary conductor. Normally, you can use the next highest overcurrent protective device ( OCPD ) above the ampacity of the conductors being protecte but not with transformer secondary conductors. Looking for online definition of OCPD or what OCPD stands for? OCPD - Interrupting Rating (I.R.).

Coordination (Selective) Localization of an overcurrent. National Electrical Code (NEC) Article 1Definitions. C)(3) Required for Campus Style Fire Pumps . To begin this discussion, open your Code book to Article 1and review the definition of “Continuous Load.