SYSTEMS EXAM | QUESTIONS AND VERIFIED
ANSWERS | LATEST 2026
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Includes conductors for delivering energy from the electricity supply system to the premises being
served.
Choose an answer
1
High-voltages
2
Conductor Protection
3
Insulation Challenge
4
Service Entrance Section
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Terms in this set (222)
Original
High-voltages
Used for efficient transmission of large amounts of electric energy over long distances.
,Transformers
Convert AC power at one voltage level to AC power of the same frequency at another voltage level,
enabling widespread distribution of electric power.
Power
Calculated as Voltage × Current, e.g., 100 V × 100 A = 10,000 Watts.
Voltage Reduction
Allows reduction of current flow, minimizing size, cost of wiring, and electrical losses.
Insulation Challenge
Higher voltages make it difficult and expensive to safely insulate between line wires and from line wires
to ground.
Unit Substations
Where the conversion from transmission to distribution occurs, stepping transmission voltage levels
down to distribution voltage levels.
Low Voltage Side
Draws more current compared to the high voltage side of a transformer.
,Feeder Circuits
Provides protection and control for the low-voltage feeder circuits, steps down the primary voltage to
the low-voltage utilization level, and incorporates terminations for the primary feeder cables and
primary switchgear.
Distribution System
Used to distribute power throughout large commercial and industrial facilities.
Service Entrance Section
Includes conductors for delivering energy from the electricity supply system to the premises being
served.
Feeder Section
A set of conductors that originate at a main distribution center and supply one or more secondary or
branch circuit distribution centers.
Branch Circuit Section
Includes conductors for delivering energy from the point of the final overcurrent device to the utilization
equipment.
Conductor Selection
Must consider ampacity, short circuit, and voltage drop requirements, based on conductor material,
gauge size, temperature rating, number of current-carrying conductors, and ambient temperature.
Conductor Protection
, All conductors installed in a building must be properly protected, usually by installing them in raceways.
Power Losses
Result from heat caused by current passing through the resistance of transmission lines, transformers,
and poor power factor, as well as non-technical losses such as administrative losses, incorrect metering,
non-paying customers, and theft/fraud.
Switchboard
A single panel or group of assembled panels with buses, overcurrent devices, and instruments.
Panelboard
Contains a group of circuit breaker or fuse protective devices for lighting, convenience receptacles, or
power distribution branch circuits, placed in a cabinet or cutout box, which is accessible only from the
front and has dead-fronts.
Busbars
Common connections for two or more circuits, with three-phase busbars required to have phases in
sequence for the same fixed phase arrangement.
Main Breaker Type Panelboard
Has the incoming supply cables connected to the line side of a circuit breaker, which in turn feeds power
to the panelboard.
Main Lug Type Panelboard