House Electrical Wiring Diagram: Every Room & Circuit

House Electrical Wiring Diagram: Every Room & Circuit — interactive diagram. Open it in the editor to customise components and wiring.

This is a free printable house electrical wiring diagram: download the diagram as SVG or open it and print to paper or PDF.

A house electrical wiring diagram details how circuits branch from the panel to every outlet, switch, and fixture in each room. This room-by-room reference helps homeowners plan renovations, electricians install compliant wiring, and inspectors verify NEC adherence throughout the structure.

House electrical wiring follows a consistent hierarchy: the utility delivers power to the service entrance, the main panel distributes it to branch circuits, and branch circuits supply outlets, switches, and fixtures in each room. Each room type has specific NEC requirements that the wiring diagram must reflect. Bedrooms must have at least one AFCI-protected 15-amp circuit; outlets must be positioned so no point on any wall is more than 6 feet from an outlet (12-foot spacing rule). Kitchens require two 20-amp small-appliance circuits serving the countertop outlets, plus a 20-amp dedicated circuit for the refrigerator, a 20-amp dishwasher circuit, and a separate 20-amp disposal circuit. All countertop outlets in kitchens must be GFCI-protected. Bathrooms need at least one 20-amp circuit dedicated to bathroom outlets only (no other rooms on this circuit), and all bathroom outlets must be GFCI-protected. Garages require GFCI protection on all outlets. Outdoor outlets are on GFCI-protected circuits. Unfinished basements require GFCI outlets. The electrical diagram for a house shows the floor plan with circuit numbers marked at each device, the panel schedule with all breaker positions, and (for permit applications) a one-line diagram showing feeder sizes. Switch leg wiring—where the hot runs to the switch box first and back to the fixture—is shown on diagrams with two-conductor cable between the switch and fixture, with both conductors being hot (the white must be re-identified). Modern wiring practice increasingly runs power to the fixture first, with a single-conductor (switch-loop) cable to the switch, allowing smart-switch installation that requires a neutral wire at the switch box.

House electrical wiring diagrams serve both planning and compliance purposes — architects and builders use AutoCAD drawings for construction documents, while homeowners and electricians in Australia and the UK use regional-standard diagrams to meet AS/NZS 3000 and BS 7671 respectively. Online and app-based tools have made it easier to produce these diagrams without specialist CAD software, though professional submissions may still require drawings in DWG format. A complete house electrical wiring diagram shows the consumer unit or distribution board, every circuit with its protective device rating and cable size, socket and lighting layout, and earthing and bonding connections. Start your own layout in the free browser-based editor.

How to wire house electrical wiring diagram

Draw the floor plan with circuit overlay Sketch each room, marking the location of every outlet (duplex symbol), switch (S), and fixture (circle). Assign circuit numbers from the panel schedule to each device grouping.
Verify NEC room requirements Check outlet spacing (6-foot rule), GFCI locations (kitchen, bath, garage, outdoor), AFCI breakers (all habitable rooms), and dedicated circuits (kitchen appliances, laundry, HVAC).
Trace branch circuit cables Following the diagram, locate cable routes in walls, ceiling, and crawlspace. Use a wire tracer or breaker finder to identify which cables belong to which circuit.
Inspect all device connections At each outlet and switch, verify black to brass (hot), white to silver (neutral), bare to green (ground). Check that no back-stab connections are used on 20-amp circuits (screw terminals only).
Test with outlet tester and GFCI function Plug a 3-light outlet tester into each outlet. Correct wiring shows the middle and right lights on. At each GFCI, press TEST and confirm loss of power at the outlet, then RESET to restore it.

Specifications

Bedroom outlet spacing	No wall point more than 6 ft from an outlet
Kitchen SABC circuits	Minimum 2 × 20 A dedicated circuits
Bathroom circuit	1 × 20 A, GFCI, dedicated to bath only
Outdoor / garage outlets	GFCI protected; weatherproof cover

Safety warnings

Never work inside a panel without verifying the utility service is isolated by the main breaker—panel busbars remain live even with all branch breakers off.
Mark any white wire used as a hot conductor (switch-loop wiring) with black tape at both ends to prevent future misidentification and shock hazard.
GFCI protection must be installed at the first outlet in the circuit protecting all downstream outlets; verify with a GFCI tester that downstream protection is active.

Tools needed

GFCI outlet tester (plug-in type with indicator lights)
Circuit tracer / breaker finder
Non-contact voltage tester (CAT III rated)
Multimeter for voltage and continuity measurements

Common mistakes

Installing a GFCI outlet in the "protected" position (load terminals) that also feeds other outlets—all downstream outlets must be connected to the GFCI load terminals, not the line terminals.
Running a kitchen countertop circuit into another room—NEC 210.52(B) requires the two small-appliance circuits to serve only the kitchen/dining/pantry area.
Failing to provide a neutral wire at switch boxes—older switch-loop wiring prevents smart dimmer and smart switch installation without running new cable.

Troubleshooting

Half the outlets in a room are dead: Cause: Open connection in a daisy-chain outlet—broken wire nut or failed backstab on one outlet breaks continuity to all downstream outlets Fix: Work backward from the last working outlet toward the dead ones. Open each box and check all wire connections with continuity mode.
GFCI protected outlets do not reset after tripping: Cause: Fault still present downstream, or the GFCI has failed and requires replacement Fix: Unplug all devices on the protected circuit. Reset GFCI. If it holds, plug devices back one at a time to identify the faulted device. If it will not reset with nothing plugged in, replace the GFCI outlet.
Smart switch installed but flickers or does not work: Cause: No neutral wire in switch box—switch-loop wiring provides no neutral for smart switch electronics Fix: Run new 14/3 cable providing a neutral to the switch box, or use a smart switch specifically designed for no-neutral installations.

Frequently asked questions

How many outlets are required per room?

NEC 210.52(A) requires outlets positioned so no point on any wall is more than 6 feet from an outlet (measured along the wall surface). In practice this means outlets roughly every 12 feet along walls, plus any wall segment over 2 feet wide. Bedrooms typically need 4-6 outlets; living rooms 6-8 depending on size. Kitchens have additional requirements based on countertop length (one outlet per 4 feet of counter, at least two circuits).

Do I need AFCI breakers in every room?

NEC 2020 requires AFCI protection on all 120-volt, 15- and 20-ampere branch circuits in dwelling units, covering essentially all habitable rooms, garages, and hallways. Exceptions exist for specific circuit types (bathrooms use GFCI protection; fire alarm circuits are exempt). Older NEC editions had narrower requirements—AFCI protection was added progressively starting with bedrooms in 2002. Always check the edition of NEC adopted by your jurisdiction, as local adoption often lags behind the current edition.

What is a switch loop and why is it being phased out?

A switch loop is a wiring method where power arrives at the fixture first, and a two-conductor cable runs down to the switch; both conductors (black and white, with white re-identified as hot) are hot—no neutral is present at the switch box. This method is functional for simple toggle switches but prevents installation of smart switches, dimmers with LEDs, and any switch requiring a neutral. NEC 2011 and later require a neutral conductor at every new switch box, effectively phasing out the traditional switch loop.

How do I add an outlet to an existing circuit?

Locate the nearest existing outlet on the circuit you wish to extend. Turn off the breaker, verify zero voltage. Open the outlet box and identify the wire entering from the panel (line) and any wire continuing to the next outlet (load). If the box has space and the circuit has capacity (check total connected load against breaker rating), run a new cable from this box to the new outlet location, connecting black to black, white to white, and bare to bare at both ends. Install new box, device, and cover plate.

What is the kitchen "small appliance circuit" requirement?

NEC 210.11(C)(1) requires at least two 20-ampere small-appliance branch circuits to supply all countertop receptacles in the kitchen, breakfast room, and pantry. These circuits must be dedicated to this purpose—no lighting or other loads allowed. The two circuits are typically run as separate 20-amp breakers and alternated among the countertop outlets so that each outlet position could be on either circuit, preventing all countertop outlets from going dead if one breaker trips.

How do I create a house electrical wiring diagram in AutoCAD?

In AutoCAD or AutoCAD Electrical, begin by drawing your floor plan to scale, then insert electrical symbol blocks from the IEC or NEMA symbol library (or import a custom block library). Draw circuit lines from the consumer unit or panel to each outlet, light, and appliance symbol. Add wire tags, circuit numbers, and MCB ratings. AutoCAD Electrical's panel schedule tools can automatically generate a distribution board schedule from the placed components.

How is a house electrical wiring diagram done in Australia?

Australian house wiring diagrams must comply with AS/NZS 3000 (the Wiring Rules). The diagram shows the main switchboard with RCDs and circuit breakers, lighting circuits (typically 10 A), power circuits (typically 20 A), and dedicated circuits for high-load appliances (stove, air conditioner, hot water). Cable colours in new work are brown (active), blue (neutral), and green/yellow (earth). All diagrams and installations require a licensed electrician and a Certificate of Electrical Safety upon completion.

How is a house electrical wiring diagram done in the UK?

UK house electrical wiring diagrams follow BS 7671 (18th Edition Wiring Regulations). The diagram shows the consumer unit with main switch, RCDs or RCBOs protecting each circuit, and ring final circuits for sockets (2.5 mm² T&E) plus radial lighting circuits (1.0 or 1.5 mm² T&E). Cable colours are brown (live), blue (neutral), and green/yellow (earth). The Electrical Installation Certificate and Minor Works Certificate are required for notifiable work under Part P of the Building Regulations.

Is there a free electrical house wiring diagram app?

Yes. CircuitDiagramMaker.com works as a free electrical house wiring diagram app in any browser, including on mobile devices, with no download required. You can place consumer unit, switch, socket, and light symbols, draw circuit routes, and export the diagram as a PDF or image. For professional-grade AutoCAD output, dedicated electrical CAD software is required.

Can I draw an electrical house wiring diagram online for free?

Yes. The free online editor at CircuitDiagramMaker.com allows you to draw a complete electrical house wiring diagram in your browser without any software installation. Place symbols for MCBs, sockets, lights, and the consumer unit, connect them with wiring lines, and add labels and circuit references. The finished diagram can be saved, printed, or shared.

What software can I use for electrical house wiring diagrams?

Options range from AutoCAD Electrical (professional, subscription-based) and EPLAN Electric P8 to mid-range tools like SEE Electrical and SOLIDWORKS Electrical, and free browser-based editors like CircuitDiagramMaker.com. For building-permit drawings, DWG-format output is often preferred; for home planning and reference, a PDF export from any capable tool is sufficient.

Is there a tutorial for drawing an electrical house wiring diagram?

An electrical house wiring diagram tutorial should cover: reading the floor plan and identifying circuit zones, understanding consumer unit layout and MCB ratings, drawing lighting and power circuits with correct cable sizes, adding earthing and bonding connections, and annotating the diagram with circuit references. Video tutorials are available on YouTube; many electrician training courses also include practical diagram-drawing exercises. Practising on a free online editor is a good way to build diagram-reading and drawing skills.