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1.2Basic Components

Overview of the Basic Components in Electrical System

TermDefinition
Home electrical systems three main components 1. The supply from the power company 2. The connection from the outside power pole to the home 3.The distribution of power throughout the home
transformer converts high-voltage transmission line of electricity to either 120 V or 240 V, which is considered safe for residential use.
service entrance equipment brings the electric power into the building and then distributes it to the branch circuits
branch circuits Supply the loads with the power they need to function; most larger appliances use their own separate circuits
panelboard breaker panel, or electric panel
service conductors the conductors (electric wires) that extend from the utility pole, manhole, or pad-mounted transformer to the service disconnecting device at the service entrance.
service drop Has conductors (electric wires) that extend from the utility pole to the first point of attachment at the building
meter a device that measures the amount of energy that’s used by a consumer. installed between the main disconnect and the service drop.
The main disconnect contains circuit breakers and service overcurrent device
circuit breakers Switches or fuses that are mounted on insulating blocks and form pull-out switches; Needed on ungrounded service entrance to protect a conductor
service overcurrent device stops the flow of current, is also contained within the main disconnect
grounding conductor a low-resistance conductor that bonds metal parts of the electrical system to the earth.
feeders Residential electrical systems are often extended by these; cables or conductors located between the main panel and the secondary panel, or subpanel.
two-pole breaker controls or protects two conductors at the same time, but has only one handle for manual switching.
typical residential electrical system usually has wires, circuit breakers, switches, and lamps.
Electrical device A receptacle, switch, or circuit breaker
White Color that indicates a neutral wire or terminal
Green Color that indicates a ground wire
Created by: CouchKingX
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