Terms/Definitions
Any current in excess of the rated current of equipment or the ampacity of a conductor
What is an overcurrent?
The circuit conductors between the final overcurrent device protecting the circuit and the outlet(s)
What is a branch circuit?
Often available in class J, H, and RK1
What is a fuse?
A term used to describe standard physical dimensions of circuit breakers
What is frame size
OCPD shall be provided in each ungrounded circuit conductor and shall be located here.
What is at the point where conductors receive their supply?
240.21
An electrical circuit condition best described as a phase or ungrounded conductor that comes into contact with another phase conductor or grounded conductor
What is short circuit?
Overcurrent protection shall be provided in this type of circuit conductor
What is ungrounded?
Encased in a sealed insulating case with a center mounted toggle operating handle
What is molded case circuit breaker?
Interrupting ratings other than 10,000 must be marked on this type of OCPD
What is a fuse?
What is 8 amps?
240.4(D)(2)
A current greater than the equipment rated current or conductor ampacity, which is confined to the normal conductive paths provided by the conductors and other equipment
What is an overload?
Supplemental overcurrent protection devices do not provide protection for this circuit condition
What is an overload?
A type of fuse the is cylindrical in shape and is installed in systems up to 300 Volts
What is a cartridge fuse?
The highest current at rated voltage that a device is identified to interrupt under standard test conditions
What is interrupting rating?
Plug fuses rated at 15 amperes and less shall be identified by this shape window, cap or other prominent part to distinguish them from fuses of higher ampere ratings.
What is hexagonal?
The amount of current available for a short circuit condition in which there is a direct connection between the ungrounded conduductors of a circuit.
What is bolted fault current?
What is selective coordination?
What is low voltage power circuit breaker?
Typically, the single most influencing factor on the magnitude of the available short-circuit current at the service
What is the service transformer?
Maximum length of a transformer secondary conductor if the transformer primary is fed from a feeder tap that is 10 feet in length.
What is 15 feet?
A graph that plots the interrupting time of an overcurrent device based on a given amount of current
What is a time current curve?
A category of overcurrent protection used for services, feeders, branch circuits, and equipment providing a full range of protection against short circuits, ground faults, and overloads.
What is branch circuit overcurrent protection?
Or
What is branch circuit?
An OCPD with a molded plastic frame, often installed in switchboards and requires charging of an energy storage device to close the circuit
What is an ICCB?
This type of circuit breaker such as 120/240V or 277/480V, is permitted on a solidly grounded system where the nominal voltage of any one conductor to ground doesn’t exceed the lower of the two values, and the nominal voltage between any two conductors doesn’t exceed the higher value.
What is slash rated?
A circuit breaker used on a circuit having an available fault current higher than the marked interrupting rating by being connected on the load side of an acceptable OCPD having a higher rating.
What is series rated?