NEC 2023 Quick References Flashcards
What is Ohm’s Law?
Ohm’s Law states that Voltage = Current x Resistance
This fundamental law relates voltage, current, and resistance in electrical circuits.
What is the formula for calculating Power?
Power = Current x Voltage
Power is measured in watts and represents the rate of energy transfer.
What must grounded conductors sized 6 AWG or smaller be identified by?
- A continuous white outer finish
- A continuous gray outer finish
- 3 continuous white or gray stripes along its length on other than green insulation
- Insulated conductors with white or gray color but with colored tracer threads
These identification methods ensure proper handling and safety.
How should the grounded conductor of a mineral insulated, metal-sheathed cable be identified?
By distinctive marking at its terminations
This requirement ensures that the grounded conductor can be identified during installation.
What is the identification requirement for service conductors supplying a one-family dwelling rated 100 through 400 amperes?
- A continuous white outer finish
- A continuous gray outer finish
- 3 continuous white or gray stripes along the entire length
This is to maintain safety and proper identification in residential electrical systems.
Fill in the blank: The formula for calculating Resistance is _______.
Resistance = Voltage ÷ Current
What are the identification methods for grounded conductors of different nominal voltage systems?
- One nominal voltage system grounded conductor must have an outer covering conforming to 200.6 (A) or (B)
- Different outer coverings for other systems conforming to 200.6 (A) or (B)
- An outer covering of white or gray with a distinguishable colored stripe other than green
This ensures that conductors can be easily identified and reduces the risk of errors.
True or False: Neutral conductors can be used for more than one branch circuit.
False
Neutral conductors must not be used for more than one branch circuit to prevent overloading.
What is the minimum requirement for the volume of the box in box fill calculations?
The volume of the box must not be less than the fill calculation
This ensures that there is sufficient space for all enclosed conductors.
What is the significance of the number of conductors in box fill calculations?
Each conductor that originates outside the box and terminates or is spliced within the box must be counted once
This counting is crucial for ensuring compliance with electrical codes.
What does the abbreviation NEC stand for?
National Electrical Code
NEC is a standard for the safe installation of electrical wiring and equipment in the United States.
What type of conductor should be grounded in a Single-Phase, 3-Wire system?
The neutral conductor
This is important for maintaining safety and proper circuit operation.
Fill in the blank: Voltage is calculated as _______.
Voltage = Power ÷ Current
What is the ampacity requirement for grounded conductors sized smaller than ungrounded conductors?
Grounded conductors must be permitted to be sized smaller than the ungrounded conductors if certain requirements are met
This flexibility allows for efficient and safe electrical design.
What is the identification requirement for terminals intended for a grounded conductor?
Must be identified by a metal or coating that is substantially white or silver or marked with the word white or the letter W
This ensures that the grounded conductor can be easily identified during installation.
