Question 1 of 10
According to NEC, what is a feeder circuit?
NEC Article 215.2 defines a feeder as the conductors between the service equipment and the final branch circuit overcurrent device.
Question 2 of 10
What percentage of the feeder rating should continuous loads not exceed?
Continuous loads are limited to 80% of the feeder's rating to prevent overheating.
Question 3 of 10
For a continuous load, the feeder conductors should be sized at what percentage of the load?
Feeder conductors for continuous loads are sized at 125% of the continuous load to prevent overheating.
Question 4 of 10
What is the primary function of overcurrent protection in a feeder circuit?
Overcurrent protection devices (breakers or fuses) protect the conductors from excessive current.
Question 5 of 10
Where must the overcurrent protection device for a feeder be located?
Overcurrent protection must be placed at the origin of the feeder to protect the conductors.
Question 6 of 10
According to NEC, which table is used for sizing equipment grounding conductors (EGCs)?
Table 250.122 is used to determine the correct size of the EGC based on the overcurrent device.
Question 7 of 10
In a subpanel, how must the grounded conductor (neutral) and the equipment grounding conductor (EGC) be treated?
The neutral and EGC must be isolated in subpanels, with only the EGC bonded to the enclosure.
Question 8 of 10
What color is typically used for the equipment grounding conductor?
Green or bare conductors are used to identify the equipment grounding conductor.
Question 9 of 10
For feeders supplying 800A or more to 3-phase, 4-wire systems, what type of protection is required?
Ground-fault protection is required for these large feeders to prevent equipment damage and service interruptions.
Question 10 of 10
What is the recommended maximum voltage drop for feeder circuits, according to common practice for maintaining efficiency?
Feeders should generally not exceed 3% voltage drop to maintain efficiency and prevent issues.
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