Basic OCPD Concepts
This device shuts off power when too much current flows.
OCPD - Overcurrent Protection Device
This happens when too many devices are plugged into one circuit.
Overload
This happens inside a fuse when excessive current flows.
The link melts, opening the circuit
Unlike fuses, circuit breakers can do this after they trip.
Be reset
This device protects people from shock by detecting current imbalance.
GFCI
This occurs when equipment operates beyond its rated ampacity.
Overload
This type of arc fault occurs when a conductor is broken and current jumps a gap.Series arc fault
Series arc fault
These are the two general types of fuses.
Plug and cartridge
This type of breaker supplies 120 volts.
Single-pole breaker
This device helps prevent fires caused by arc faults.
AFCI
This type of fault happens when a hot wire contacts a neutral or ground.
Short circuit
This type of arc fault can occur when a nail punctures a cable.
Parallel arc fault
This is the maximum amp rating for plug fuses.
30 amps
This type of breaker connects to both legs of a panel.
Double-pole breaker
A GFCI trips at approximately this current level.
6 mA
This type of fault occurs when a hot conductor touches a grounded surface like a metal box.
Ground fault
This type of fault creates extremely high current due to very low resistance.
Short circuit
These fuses prevent incorrect replacement by using adapters.
Type S fuses
This breaker type allows two circuits in the space of one.
Tandem breaker
Name two locations where GFCI protection is required.
Bathrooms, kitchens, outdoors, garages, basements, etc. (any two)
This dangerous condition involves current flowing through an unintended path, creating high heat and sparks.
Arc fault
Explain the key difference between a ground fault and a short circuit.
Ground fault = current to ground; Short circuit = hot to neutral/another conductor
Why are Edison-base fuses considered dangerous?
They allow higher-rated fuses to be installed, creating a fire hazard
Why must panels be designed specifically for tandem breakers?
To prevent overloading and ensure safe operation of the panel
Name the 3 places that AFCI Protection is NOT Required in a residence.
Bathrooms, Garages, Outside Receptacles