Resi Chapter 6

What kind of service is typical for a residential system?

120/240 V, single phase, three wire service

Line (ladder) diagram

A diagram that shows the logic of an electrical circuit or system using standard electrical symbols

Wiring diagram

A diagram that shows the wired connections of all components in an electrical device

One line diagram

A diagram that uses single lines and graphic symbols to show the current path, voltage values, circuit disconnect, OCPDs, transformers, and service panels for a residential electrical system

Schematic diagram

A drawing that indicates the electrical connections and functions of a specific circuit arrangement using graphic symbols

Pictorial drawing

A drawing that shows the length, height, and depth of an object in one view

Symbol

A graphic representation of a device, component, or object on a print

Component Plan

A group of electrical component schedules that state the required locations for receptacles, lights, and switches

Abbreviation

A letter or combination of letters that represents a word

Home Run

A line with an arrow that shows where circuit wiring should return to the service panel

Electrical Component Schedule

A list of electrical equipment that indicates manufacturer specifications and how many of each electrical device are required for a room or area in a component plan

Floor Plan

A print that provides a plan view of a floor of a residence

Electrical Floor

A print that shows all of the power circuits for a specific floor of a residence

What are the five main parts of an electrical circuit?

A source of electricity, a load that converts electrical energy into some other usable form of energy such as light heat or motion, a method of controlling the flow of electricity, circuit protection to ensure that the circuit operates safely within electrical limits, and a way of connection by conductors/cables to attach individual devices and loads together

Electrical Circuit

An assembly of conductors, electrical devices, and electrical components/loads through which current flows

Wiring Plan

An electrical floor plan that indicates the type, placement, and connection of all electrical devices required to wire an electrical circuit

Manually controlled circuit

Any circuit that requires a person to initiate an action for the circuit to operate

Automatically controlled circuit

Any circuit that uses a control device to initiate an action for a circuit to operate

Why do electricians use electrical floor plans?

Interpret the type of installation that must be performed

What is a pictorial drawing and what does it indicate?

Pictorial drawings indicate physical details of an object or and electrical drawing as seen by the eye

What are the typical power symbols shown on electrical floor plans?

Service panels and motor devices; 2-, 3-, or 4- wire cables; and other line symbols that show exposed or hidden cables in walls, ground connections, or home runs

What kind of devices are shown on electrical floor plans for one family dwellings?

Service panels, receptacles, light fixtures, switches, appliances, telephones, television and data outlets, plumbing fixtures, fire alarms, smoke/carbon monoxide detectors, and locations of thermostats for temperature control

What are the typical receptacles shown on electrical floor plans?

Standard, isolated ground, special purpose, and ground fault circuit interrupter

Why are wiring plans essential for installations?

They indicate the type of switch, cable/wire, and receptacle used for each circuit in a room

What is a one line diagram used for and what does it show?

Uses single lines and graphic symbols to show the current path , voltage values, circuit disconnect, etc.

What is the difference between a wiring diagram and a schematic diagram?

Wiring diagrams shows the wired connections of components in an electrical device whereas a schematic diagram indicates electrical connections and functions of a specific circuit arrangement