Nec Service Definition
Service equipment. This necessary equipment, which usually consists of circuit breakers or switches and fuses and their accessories, is connected to the load end of plant managers who operate a structure and represent the main control and shutdown of the power supply. Service installations do not include measuring instruments such as meters and/or meter housings (§§ 230-66). The 1999 NEC revision of this definition removes references to appropriate space. You can operate underground feed sides from masts or transformers (with or without terminal boxes) – as long as they start at the point of service. The NEC does not cover conductors on the power side of the point of service. The National Electrical Code refers to the term “service equipment” in nearly 50 code articles. Understanding where service begins and ends is critical to the proper application of many code rules, especially grounding, binding, and publishing agents. To understand how to apply these rules, read the following definitions in Article 100. Too many electricians (and inspectors) think that service managers include secondary conductors of transformers and power conductors of a remote building. This misunderstanding has led to several inappropriate and dangerous neutral to enclosure connections on circuit breakers and switchboards. To ensure a safe electrical installation, you know where the service starts and ends.
You must separate ground service equipment, derived systems separately and separate buildings and structures in accordance with sections 250-24, 250-30 and 250-32, respectively. Cabling of the premises. A cabling system includes internal and external wiring that extends from the service point (power conductors) or power source (for example, battery) to the media(s). Understand that the code defines an outlet as a point in the wiring system where the power supply equipment – a plug is not necessarily an outlet. This wiring includes power, lighting, control and signal circuits as well as their hardware, fittings and wiring devices. This wiring does not include wiring in equipment, devices, motors, controllers, motor control centers and similar devices. Note that these farm managers only come from the supply side. “Service Scale” is an umbrella term that may include service declines, lateral service scales and service entry scales.
This definition excludes cabling on the power side of the point of service. These overhead contact lines terminate at the building or structure at another wiring method defined as the overhead contact line operations manager. This term also applies to conductors (e.g. SE-type cables) that are powered by a service drop on a building or structure. Underground operations managers are installed when the utility is underground and the utility does not install lateral ladders to the building or structure. In this case, the underground feed conductors (usually in a hand hole or manhole) are connected to the underground feed. If underground feed conductors terminate in splice to other wiring methods on the delivered building or structure (for example, conductors in a line to feed several operational release agents), these conductors are defined as input conductors for underground network services. Summarizing. The utility company and local codes usually indicate the location of the service point. However, you should always check these codes when determining the service point.
Therefore, service scales and service page scales may or may not be part of the service, as described in the NEC. For example, an off-grid building powered solely by an emergency generator is powered by an external power supply, not by power conductors. The next definition we need to consider is the point of service where utility facilities and space wiring are connected. The wiring of premises is also defined in Article 100. Service entry/air system scale. The code defines this system as the operating managers between the terminals of the service equipment and a point that is usually outside the building (free of walls), where it is connected to the drip or splice service (Fig. 2). Conductor of the supply circuit. The code defines power supplies as all circuit conductors between the control gear, the source of a separately derived system or other power source, and the final overcurrent protection device. Different interpretations of the Code have caused confusion in determining a building`s point of service. Clarifying some definitions is the first step to mastering this complicated subject.
If you encounter confusion or difficulty in determining a point of service, refer to the definitions in Article 100. Knowing where the service ends can put an end to some typical problems. Checking these definitions should help you understand that service providers originate from the public service (point of service) and end up on the side of the release officer line (service facilities). The following conductors and devices on the load side of the service equipment are considered power conductors: If the supply point is on the electricity pylon, the plant managers of an overhead line network start at the power tower and are connected to the power release agents. If the service point is present at the power shaft, the service managers start at the power shaft and connect to the power release agent. Service Manager. These run from the service point to the service release agent (the service device, not the counter). Service line managers can enter a facility from above (Service Drop) or underground (Service Lateral). Service Manager. Service managers are the managers from the point of service to the service distribution agent. Service-Eingangsleiter/U-Bahn-System.