Ampora is an AI-powered electrical calculator and reference app designed for electricians and electrical engineers. It includes professional tools like voltage drop calculator, wire sizing calculator, conduit fill calculator, arc flash analyzer, load calculation tools, and a comprehensive NEC code reference database.

What electrical calculators does Ampora include?

Ampora includes six professional electrical calculators: Voltage Drop Calculator, Wire Sizing Calculator, Conduit Fill Calculator, Arc Flash Analyzer, Load Calculation Tool, and Motor Sizing Calculator. All calculations are NEC code-compliant.

Does Ampora have an AI assistant for electrical questions?

Yes, Ampora features an advanced AI assistant trained on electrical engineering and NEC code. You can ask questions about electrical work, troubleshooting, code compliance, and get instant, accurate answers backed by NEC references.

Is Ampora compliant with NEC electrical codes?

Yes, all Ampora calculators and references are based on NEC 2023 standards. The app includes a comprehensive NEC code database with search functionality and article references.

Can Ampora analyze photos of electrical panels?

Yes, Ampora includes AI-powered photo analysis. Upload photos of electrical panels, wiring, and equipment to get intelligent analysis, safety recommendations, and troubleshooting guidance.

How do I calculate voltage drop for electrical circuits?

Use Ampora's Voltage Drop Calculator to calculate voltage drop for single-phase and three-phase circuits. Enter your circuit voltage, current, wire gauge, and distance to get accurate NEC-compliant voltage drop calculations. The app uses the standard formula VD = (2 × K × I × D) / CM for single-phase and VD = (1.732 × K × I × D) / CM for three-phase circuits.

What is the best app for electricians?

Ampora is designed specifically for electricians and electrical professionals. It combines AI assistance, professional calculators (voltage drop, wire sizing, conduit fill, arc flash), NEC code reference, photo analysis, and troubleshooting tools in one mobile app. It's free to download from the App Store.

How do I size electrical wire using NEC tables?

Wire sizing requires checking NEC Table 310.16 for conductor ampacity based on insulation temperature rating (60°C, 75°C, or 90°C). Apply temperature correction factors if ambient temperature exceeds 30°C, and conduit fill derating if more than 3 current-carrying conductors are in a raceway. Ampora's Wire Sizing Calculator handles all these factors automatically.

What is the NEC 3% voltage drop rule?

NEC 210.19(A) Informational Note recommends maximum 3% voltage drop for branch circuits and 5% total voltage drop (feeder + branch circuit combined). While these are recommendations, not requirements, many inspectors enforce them. For a 120V circuit, 3% equals 3.6V maximum drop.

Where is GFCI protection required by NEC code?

Per NEC 210.8, GFCI protection is required for 125V-250V receptacles in bathrooms, kitchens (countertop and within 6 feet of sink), garages, outdoors, basements, crawl spaces, laundry areas, and within 6 feet of any sink. The NEC 2023 expanded requirements to include 250V receptacles in many locations.

What is AFCI protection and where is it required?

Arc-Fault Circuit Interrupter (AFCI) protection detects dangerous arcing conditions that could cause fires. Per NEC 210.12, AFCI protection is required for 120V, 15A and 20A branch circuits in dwelling unit bedrooms, living rooms, kitchens, dining rooms, family rooms, hallways, closets, and similar rooms.

How do I calculate conduit fill?

Conduit fill is calculated using NEC Chapter 9 tables. One conductor can fill 53% of conduit area, two conductors can fill 31%, and three or more can fill 40%. Use Ampora's Conduit Fill Calculator to automatically determine the correct conduit size based on conductor types, sizes, and quantities.

Is Ampora free to use?

Yes, Ampora is free to download from the App Store. The app includes AI assistant, all six electrical calculators, NEC code reference, photo analysis, and troubleshooting tools. No credit card required to get started.

Can I use Ampora offline on job sites?

Ampora's electrical calculators and reference formulas work offline. The AI assistant and photo analysis features require an internet connection to process queries through our AI system.

What is arc flash analysis?

Arc flash analysis calculates incident energy levels and arc flash boundaries to determine required personal protective equipment (PPE) when working on energized electrical equipment. Ampora's Arc Flash Calculator follows IEEE 1584 and NFPA 70E standards to provide incident energy, working distance, and PPE category recommendations.

How do I calculate electrical load for a service?

Residential service load calculations follow NEC Article 220. Start with 3 VA per square foot for general lighting, add small appliance circuits (1500 VA each), laundry circuit (1500 VA), and individual appliance loads. Apply demand factors per NEC Table 220.42 and 220.54. Ampora's Load Calculation tool automates this process.

What are NEC receptacle spacing requirements?

Per NEC 210.52, no point along the floor line of any wall space can be more than 6 feet from a receptacle outlet. This means receptacles must be spaced no more than 12 feet apart. Any wall section 2 feet or wider requires a receptacle. Kitchen countertops require receptacles so no point is more than 24 inches from an outlet.

Does Ampora work for commercial electricians?

Yes, Ampora is designed for both residential and commercial electricians. It includes commercial-focused tools like motor sizing calculator with full load current tables, three-phase voltage drop calculations, arc flash analysis, and NEC code reference covering commercial requirements.

How do I prepare for an electrical inspection?

Before calling for inspection: verify permits are posted, all work is complete for that phase, boxes are accessible, panels are open, and work area is clean. Use Ampora's AI assistant to verify code compliance on specific questions like GFCI locations, AFCI requirements, box fill, and receptacle spacing before the inspector arrives.

NEC Article 210 Explained: Complete Guide to Branch Circuits | Ampora

What is NEC Article 210?

NEC Article 210 covers Branch Circuits - the portion of the wiring system that extends beyond the final overcurrent device (breaker or fuse) protecting the circuit. This article is one of the most frequently referenced sections of the National Electrical Code because it applies to virtually every electrical installation.

Article 210 establishes requirements for:

Branch circuit ratings and classifications
Conductor sizing and identification
Ground-fault circuit interrupter (GFCI) protection
Arc-fault circuit interrupter (AFCI) protection
Required outlets for receptacles, lighting, and appliances

Pro Tip: Use Ampora's AI assistant to quickly look up specific NEC 210 sections while on the job site. Just ask "What are the GFCI requirements for kitchens?" and get instant code references.

Branch Circuit Ratings (210.3)

Branch circuits are classified by the rating of the overcurrent device (breaker or fuse). Per NEC 210.3, branch circuits that supply multiple outlets or receptacles must be rated at one of these standard values:

15-Ampere Circuits

General lighting and receptacles. Most common in residential work. Requires 14 AWG minimum conductors.

20-Ampere Circuits

Kitchen, bathroom, garage, and outdoor receptacles. Required for small appliance loads. Requires 12 AWG minimum conductors.

30-Ampere Circuits

Fixed appliances like dryers, water heaters. Requires 10 AWG minimum conductors.

40 & 50-Ampere Circuits

Cooking appliances, ranges, large equipment. Requires 8 AWG (40A) or 6 AWG (50A) minimum.

Conductor Sizing Requirements

NEC 210.3 requires branch circuit conductors to have an ampacity not less than the maximum load to be served. The minimum conductor sizes for standard branch circuits are:

Circuit Rating	Minimum Copper AWG	Minimum Aluminum AWG
15 Ampere	14 AWG	12 AWG
20 Ampere	12 AWG	10 AWG
30 Ampere	10 AWG	8 AWG
40 Ampere	8 AWG	6 AWG
50 Ampere	6 AWG	4 AWG

Note: Conductors may need to be upsized for voltage drop on long runs. Use Ampora's Wire Sizing Calculator to verify.

GFCI Protection Requirements (210.8)

NEC 210.8 specifies where ground-fault circuit-interrupter protection is required. GFCI protection must be provided for all 125-volt through 250-volt receptacles in the following locations:

Dwelling Units (210.8(A))

Bathrooms - All receptacles
Garages and accessory buildings - All receptacles with floor at or below grade
Outdoors - All receptacles with direct grade-level access
Crawl spaces - At or below grade level
Basements - Unfinished (finished basements excluded except for laundry areas)
Kitchens - All receptacles serving countertop surfaces and within 6 feet of sink
Sinks - Receptacles within 6 feet of outside edge (all locations)
Boathouses - All receptacles
Bathtubs and shower stalls - Receptacles within 6 feet
Laundry areas - All receptacles
Indoor damp/wet locations - All receptacles

Other Than Dwelling Units (210.8(B))

Bathrooms
Kitchens
Rooftops
Outdoors
Sinks (within 6 feet)
Indoor wet locations
Locker rooms with shower facilities
Garages, service bays, and similar areas
Crawl spaces at or below grade
Unfinished basements
Bathtubs and shower stalls (within 6 feet)

Important: The NEC 2023 expanded GFCI requirements significantly. Receptacles rated up to 250V now require GFCI protection in specified locations, including 240V outlets for HVAC equipment outdoors.

AFCI Protection Requirements (210.12)

Arc-fault circuit-interrupter protection is required for 120-volt, single-phase, 15- and 20-ampere branch circuits in dwelling units supplying outlets and devices in:

Kitchens
Family rooms
Dining rooms
Living rooms
Parlors
Libraries
Dens
Bedrooms
Sunrooms
Recreation rooms
Closets
Hallways
Laundry areas
Similar rooms or areas

AFCI protection can be provided by AFCI circuit breakers, AFCI receptacles (at the first outlet), or a combination approach as permitted by NEC 210.12(A).

Receptacle Outlet Requirements (210.52)

NEC 210.52 specifies the minimum number and placement of receptacles in dwelling units. These requirements ensure that appliances can be used without extension cords.

General Provisions - Wall Spacing Rule

Receptacles must be installed so that no point along the floor line of any wall space is more than 6 feet from a receptacle outlet. This means:

Maximum 12 feet between receptacles on a wall
Any wall space 2 feet or wider requires a receptacle
Fixed panels in exterior walls (sliding glass doors) are not wall space

Kitchen Countertop Receptacles (210.52(C))

Receptacle required for each countertop space 12 inches or wider
No point along countertop can be more than 24 inches from a receptacle (2-foot rule)
Island countertops require at least one receptacle per NEC 210.52(C)(2)
Peninsular countertops require at least one receptacle
Must be supplied by 20-ampere small appliance branch circuits

Bathroom Receptacles (210.52(D))

At least one receptacle outlet required within 3 feet of the outside edge of each basin. Must be on a 20-ampere circuit with no other outlets (or dedicated bathroom circuit serving only that bathroom).

Outdoor Receptacles (210.52(E))

At least two receptacles at one- and two-family dwellings (front and back)
One receptacle accessible from grade at each entrance to the dwelling
Balconies, decks, and porches with usable area require receptacles

Lighting Outlet Requirements (210.70)

NEC 210.70 specifies where lighting outlets are required in dwelling units:

Habitable Rooms

At least one wall switch-controlled lighting outlet required in every habitable room, including kitchens and bathrooms. In non-habitable rooms (like closets), a lighting outlet is required if the room is illuminated.

Additional Requirements

Hallways: Lighting outlet required in hallways
Stairways: Lighting at each floor level and landing, with 3-way switching at top and bottom
Garages: At least one lighting outlet
Outdoors: Lighting outlets at outdoor entrances/exits
Basements/Attics/Crawl spaces: Lighting required with switch at entry point

Common Article 210 Code Violations

Inspectors frequently cite these NEC Article 210 violations. Make sure your work avoids these common mistakes:

Missing GFCI Protection

Forgetting GFCI in required locations - especially the 6-foot sink rule, laundry areas, and unfinished basements.

Kitchen Circuit Errors

Using 15A circuits for kitchen countertops (must be 20A), or not providing the required two small appliance circuits.

Bathroom Circuit Sharing

Running bathroom receptacle on a circuit with other outlets outside that bathroom (unless it's a dedicated bathroom circuit).

Wall Spacing Violations

Exceeding the 6-foot/12-foot spacing rule for receptacles, or missing receptacles on 2-foot wall sections.

Missing AFCI Protection

Not providing AFCI on bedroom and other required circuits in dwelling unit bedrooms, living areas, and kitchens.

Look Up NEC Code Instantly

Ampora's AI assistant can answer your NEC questions in seconds. Ask about Article 210 requirements, get conductor sizing help, and verify code compliance on the job site.

Download Ampora Free

Calculations

How to Calculate Voltage Drop