Questions and Answers
What is the maximum number of feeders permitted where feeder conductors originate in the same panelboard?
A multiwire branch circuit is considered a single circuit.
True
What types of systems may allow additional feeders or branch circuits?
Fire pumps, emergency systems, legally required standby systems, optional standby systems, parallel power production systems, electric vehicle charging systems, docking facilities.
Additional feeders may be permitted where the capacity requirements are in excess of ______ amperes at a supply voltage of 1000 volts or less.
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Match the following conditions with their descriptions:
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What must each disconnect be marked to indicate?
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Study Notes
Overview of Supply Rules
- A building or structure served by a branch circuit or feeder from a service disconnect must use only one feeder or branch circuit unless exceptions apply.
- A multiwire branch circuit is treated as a single circuit.
- Only one feeder or branch circuit can bring power back from additional buildings, with certain exceptions.
Special Conditions for Extra Feeders
- Additional feeders/branch circuits are allowed for:
- Fire pumps
- Emergency systems
- Legally required standby systems
- Optional standby systems
- Parallel power production systems
- Systems with multiple supply sources for improved reliability
- Electric vehicle charging systems designed for multiple circuits/feeds
- Docking facilities and piers
Common Supply Equipment
- If feeders are from the same panelboard, a maximum of six feeders can be used.
- All disconnects for feeders must be grouped together in a single location, exempting them from certain requirements.
- Each disconnect must be clearly marked to indicate the load it serves.
Special Occupancies
- Additional feeders or branch circuits may be permitted for:
- Multiple-occupancy buildings lacking accessible supply space for all users.
- Large buildings where multiple supplies are necessary.
Capacity Requirements
- Additional feeders or branch circuits are permissible when capacity exceeds 2000 amperes at a supply voltage of 1000 volts or lower.
Additional Characteristics
- Extra feeders or branch circuits allowed for:
- Different voltages, frequencies, or phases.
- Separate uses, such as controlling outdoor lighting from various locations.
Documented Switching Procedures
- Additional feeders can be supplied under single management provided that documented safe switching procedures are established and followed for disconnection.
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Description
Test your knowledge on the supply rules governing electrical systems, including branch circuits and feeders. Explore special conditions for additional feeders and the common supply equipment requirements. This quiz is essential for understanding the regulations that ensure electrical safety and efficiency.
