The Electrical System gallery offers 159 illustrations of household wiring, switches, and other electrical elements. For electrical lighting, please see the Electric Lighting gallery.

An air-insulated choke coil for pressures up to 150,000 volts.

Air Insulated

An air-insulated choke coil for pressures up to 150,000 volts.

Horn-gap, choke-coil protector for alternating-current lines.

Alternating Current

Horn-gap, choke-coil protector for alternating-current lines.

An outlet box attached to the ceiling.

An Outlet Box

An outlet box attached to the ceiling.

A 90 degree angle connector.

Angle Connectors

A 90 degree angle connector.

A Multigap alternating-current arrester with series resistance arranged for pole mounting.

Arrester

A Multigap alternating-current arrester with series resistance arranged for pole mounting.

A cross section of a General Electric company 115,000 - 135,000 volt electrolytic arrester tank.

Arrester Tank

A cross section of a General Electric company 115,000 - 135,000 volt electrolytic arrester tank.

Boiler house and generating station of the Remington Arms and Ammunition Company in Bridgeport, Connecticut.

Boiler House

Boiler house and generating station of the Remington Arms and Ammunition Company in Bridgeport, Connecticut.

Bracket box.

Box

Bracket box.

An assembled bracket box and fixture stud.

Bracket Box

An assembled bracket box and fixture stud.

A device that trips like a switch and opens the circuit when overloaded.

Circuit Breaker

A device that trips like a switch and opens the circuit when overloaded.

A building wired for double-pole switches.

Building

A building wired for double-pole switches.

A Burke suspension lightning protector for pressures of up to 6600 volts.

Burke Protector

A Burke suspension lightning protector for pressures of up to 6600 volts.

A 100-amp choke coil designed for pressures of up to 6600 volts.

Choke Coil

A 100-amp choke coil designed for pressures of up to 6600 volts.

"A medium-capacity, double-pole circuit breaker (250 volts, 200 amp. General Electric Company, type C, form G)." —Croft 1920

Circuit Breaker

"A medium-capacity, double-pole circuit breaker (250 volts, 200 amp. General Electric Company, type…

"A heavy-current (2000 amp.) 650-volt, single-pole overload circuit breaker (General Electric Company, type C, form K2)." —Croft 1920

Circuit Breaker

"A heavy-current (2000 amp.) 650-volt, single-pole overload circuit breaker (General Electric Company,…

A medium capacity double pole circuit breaker (250 volt, 200 amp. General Electric Company, type C, form G).

circuit breaker

A medium capacity double pole circuit breaker (250 volt, 200 amp. General Electric Company, type C,…

A heavy current (2000 amp.) 650 volt, single pole overload circuit breaker (General Electric company, type C, form K2).

circuit breaker

A heavy current (2000 amp.) 650 volt, single pole overload circuit breaker (General Electric company,…

"Diagrammatic drawing of a time-limit circuit breaker." —Croft 1920

Time-limit Circuit Breaker

"Diagrammatic drawing of a time-limit circuit breaker." —Croft 1920

The diagram of "circuit-breaker type" lightning protector.

Circuit-breaker Type

The diagram of "circuit-breaker type" lightning protector.

An umbrella being used for catching dirt at a ceiling outlet.

Cleaning Ceiling Outlets

An umbrella being used for catching dirt at a ceiling outlet.

A Westinghouse "pancake type" choke coil for pressures from 2200 to 25000 volts.

Coil

A Westinghouse "pancake type" choke coil for pressures from 2200 to 25000 volts.

Arrangement of two-phase conductors on cross arms.

Conductors

Arrangement of two-phase conductors on cross arms.

Installation of a concealed conduit where the conduit run is available.

Conduit

Installation of a concealed conduit where the conduit run is available.

Second story floor boards removed and a conduit placed in the joist slot.

Conduit in Place

Second story floor boards removed and a conduit placed in the joist slot.

Conduit lines installed in an elevator shaft in a finished building.

Conduit Lines

Conduit lines installed in an elevator shaft in a finished building.

Vertical conduit run to serve different floors or different apartments.

Conduit Run

Vertical conduit run to serve different floors or different apartments.

Rigid conduit switchbox in position.

Conduit Switchbox

Rigid conduit switchbox in position.

Conduit runs supported on the outside of a building.

Conduits

Conduit runs supported on the outside of a building.

Methods of connecting an alternate-current demand meter for 440 and 660-volt loads. For 110 and 220-volt loads (and direct-current loads), the transformer is omitted.

Connecting Demand Meter

Methods of connecting an alternate-current demand meter for 440 and 660-volt loads. For 110 and 220-volt…

A flexible connector connected to a rigid connector.

Connectors

A flexible connector connected to a rigid connector.

Construction around windows.

Construction

Construction around windows.

A plan of the desk's face and front elevation of the control desk instrument board.

Contol Desk

A plan of the desk's face and front elevation of the control desk instrument board.

Westinghouse control pedestal used in combination with an instrument post.

Control Pedestal

Westinghouse control pedestal used in combination with an instrument post.

Sectional elevation showing a typical arrangement of a synchronous converter sub-station for electric railway service.

Converter

Sectional elevation showing a typical arrangement of a synchronous converter sub-station for electric…

A cupped-disc-gap protector.

Cupped-disc-gap Protector

A cupped-disc-gap protector.

The path of current through person receiving a shock from the frame of a machine insulated from the ground.  (There is an accidental tree ground on the line and an accidental ground in the winding of the machine.)

current of shock

The path of current through person receiving a shock from the frame of a machine insulated from the…

Cross section of Ashoken Dam.

Dam

Cross section of Ashoken Dam.

The Wright demand meter.

Demand Meter

The Wright demand meter.

A dirt catching device assembled and cross-sectioned.

Device

A dirt catching device assembled and cross-sectioned.

Front view of the five-panel direct-current switchboard.

Direct Current Switchboard

Front view of the five-panel direct-current switchboard.

Ratchet drills.

Drill

Ratchet drills.

Method of drying out a generator by short-circuiting the armature through a water rheostat.

Drying out generator

Method of drying out a generator by short-circuiting the armature through a water rheostat.

Pathway of leakage due to the installation on damp insulation.

Electric Generator

Pathway of leakage due to the installation on damp insulation.

A combination pumping and electric-light plant driven by a gravity waterwheel.

Electric Plant

A combination pumping and electric-light plant driven by a gravity waterwheel.

The cover of the National Light Association booklet.

Electric Sign

The cover of the National Light Association booklet.

Sectional elevation of a General Electric Company electrolytic protector.

Electrolytic Protector

Sectional elevation of a General Electric Company electrolytic protector.

Westinghouse equalizer pedestal with a switch for compound-wound direct-current generator.

Equalizer

Westinghouse equalizer pedestal with a switch for compound-wound direct-current generator.

Sectional elevation of the turbine building of the Essex Station.

Essex Station

Sectional elevation of the turbine building of the Essex Station.

An exposed conduit installation.

Exposed Conduit

An exposed conduit installation.

Exterior view of building that was wired.

Exterior

Exterior view of building that was wired.

Fasteners for Kuhlo wire.

Fasteners

Fasteners for Kuhlo wire.

Supporting fixture from an attic.

Fixture

Supporting fixture from an attic.

A flexible conduit connected to a flexible conduit.

Flexible Connector

A flexible conduit connected to a flexible conduit.

Manipulation of the special flooring saw.  (Starting the cut).

Flooring Saw

Manipulation of the special flooring saw. (Starting the cut).

Typical framing of a wooden building.

Framing

Typical framing of a wooden building.

An Edison fuse plug and casing for switchboard use.

fuse plug and casing

An Edison fuse plug and casing for switchboard use.

Fuse protection for voltmeter and ground detector on a direct-current switchboard.
Fuse protection on instrument circuit of an alternating-current switch-board.

Fuse protection

Fuse protection for voltmeter and ground detector on a direct-current switchboard. Fuse protection on…

"Fuse protection on instrument circuit of an alternating-current switchboard." —Croft 1920

Fuse Protection on Alternating Current Switchboard

"Fuse protection on instrument circuit of an alternating-current switchboard." —Croft 1920

"Edison fuse plugs and casings for switchboard use." —Croft 1920

Casing and Fuse Plugs

"Edison fuse plugs and casings for switchboard use." —Croft 1920

"Illustrating fuse protection for voltmeter and ground detector and ground detector on a direct-current switchboard." —Croft 1920

Fuse Protection on Direct Current Swtichboard

"Illustrating fuse protection for voltmeter and ground detector and ground detector on a direct-current…