What are Electrical Feeders?
Electric feeders carry power from a building's main electrical supply to downstream panels and distribution equipment.
Definition
Purpose
Electric feeders link a building's main power supply to its branch circuits. They distribute power to panelboards, switchboards, or other distribution equipment, where it is divided among smaller circuits serving individual loads.
Feeder conductors vary in size and protection based on the electrical load they are expected to carry.
Examples of Use
- Commercial and industrial buildings: Feeders supply power from the main service equipment to other electrical panels serving different floors, areas, or tenant spaces.
- Subpanels: A feeder can supply a remote subpanel, which then distributes power through branch circuits to lighting, receptacles, and equipment.
- Generator systems: Conductors connecting a generator or other power source to downstream distribution equipment can function as feeders when they are not service conductors.
Notes
- Feeder conductors can be installed as individual conductors, cables, or other approved wiring methods depending on the application.
- Feeder sizing and overcurrent protection depend on factors such as calculated load, conductor ampacity, and the applicable electrical code requirements.
- Feeders may supply multiple branch circuits, making them a key part of a building's electrical distribution system.
- Feeders can originate from different power sources, including service equipment, transformers, generators, and other power-supply systems.
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