Residential
What color insulation is standard for the hot wire in a basic 120V US residential branch circuit?
What is Black?
Which type of heavy-duty metal raceway is commonly used in commercial buildings because it can be bent by hand with a tool?
What is EMT?
What is the primary purpose of a magnetic contactor in a motor control circuit?
What is to switch a high-current motor load using a low-current control signal. ?
Three phase transformers are configured as Delta or ____.
What is Wye?
Which size circuit breaker is standard for a residential lighting circuit wired with 14 AWG copper wire?
What is 15A?
What is the standard voltage and phase configuration for large commercial buildings to power heavy HVAC and machinery?
What is 277V/480V Three-Phase?
Which device protects an electric motor from overheating due to drawing too much current for an extended period?
What is an Overload Relay?
How many travelers (swimming wires) run between two switches in a standard 3-way switch configuration?
What is 2?
Which type of commercial cable features insulated conductors wrapped in a flexible, interlocking metal armor sheet with an internal green grounding wire?
What is MC (Metal-Clad)?
What is the function of a "holding contact" (also known as a sealing or maintaining contact) wired in parallel with a start push button?
What is it keeps the contactor coil energized after the operator releases the momentary start button. ?
In a balanced three-phase system, what is the phase angle displacement between any two adjacent voltage waveforms?
What is 120?
A standard electric clothes dryer typically runs on a dedicated 240V circuit. What gauge copper wire and breaker size does it normally require?
What is 10 AWG, 30A?
In commercial space design, what is the maximum number of current-carrying conductors allowed in a single conduit before you must apply a code-mandated ampacity derating factor?
What is 3?
How do you reverse the rotation direction of a standard three-phase AC induction motor?
What is swap any two of the three incoming power phases.
Which popular three-phase transformer connection configuration provides a neutral point, allowing for both line-to-line and line-to-neutral connections?
What is Wye?
What happens to the neutral wire when an Arc-Fault Circuit Interrupter (AFCI) detects a parallel arc condition?
What is the breaker opens both the hot and neutral internal path to cut all power. ?
Why are isolated ground (IG) receptacles, marked with an orange triangle, used in commercial office or medical spaces?
What is to protect electronic equipment from high-frequency electromagnetic noise on the building ground. ?
In a dual-voltage three-phase motor (e.g., 230V/460V) wired for a Low-Voltage (230V) application, how must the internal phase windings be connected?
What is in Parallel.