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.

Motor Sizing Calculator

Calculate motor full load current, overcurrent protection, conductor sizing, and starter selection per NEC Article 430.

Use Calculator in App

What is Motor Sizing?

Motor sizing involves properly selecting conductors, overcurrent protection, and controllers for motor branch circuits. The NEC Article 430 provides specific requirements that differ from standard branch circuit rules.

Motor circuits require special consideration due to high starting currents (typically 6-8× FLC) and the need for both overload protection (thermal) and short-circuit protection (magnetic).

Three-Phase Motor FLC (NEC Table 430.250)

Full-load currents for three-phase AC motors at various voltages:

HP	208V	230V	460V	575V
1	4.6A	4.2A	2.1A	1.7A
3	11.0A	9.6A	4.8A	3.9A
5	17.5A	15.2A	7.6A	6.1A
7.5	25.3A	22A	11A	9A
10	32.2A	28A	14A	11A
15	48.3A	42A	21A	17A
20	62.1A	54A	27A	22A
25	78.2A	68A	34A	27A
30	92A	80A	40A	32A
50	143A	130A	65A	52A

Motor Circuit Protection (NEC 430.52)

Maximum short-circuit protection as a percentage of motor FLC:

Motor Type	Non-Time Delay Fuse	Dual Element Fuse	Inverse Time Breaker
Single-Phase	300%	175%	250%
Squirrel Cage	300%	175%	250%
Wound Rotor	150%	150%	150%
Synchronous	300%	175%	250%

Key NEC Motor Sizing Rules

Conductor Sizing (430.22)

Branch circuit conductors must be at least 125% of motor FLC from NEC tables.

Overload Protection (430.32)

115% of nameplate FLA for service factor ≥1.15 or temp rise ≤40°C. 125% for all others.

Short-Circuit Protection (430.52)

Size per Table 430.52. Round up to next standard size if calculated value doesn't correspond.

Disconnect (430.110)

Motor disconnect must be rated at least 115% of motor FLC from NEC tables.

Motor Circuit Example

Problem:

Size the branch circuit components for a 10 HP, 460V, 3-phase squirrel cage motor.

Solution:

FLC (Table 430.250): 14A

Conductor: 14 × 1.25 = 17.5A → 12 AWG (THHN = 25A)

Overload: 14 × 1.15 = 16.1A → 16A heater

Short-Circuit (Inverse Time): 14 × 2.5 = 35A → 35A breaker

Disconnect: 14 × 1.15 = 16.1A → 30A rated switch

Use: 12 AWG THHN, 16A overload, 35A breaker, 30A disconnect

Instant Motor Sizing with Ampora

Enter motor HP and voltage - get complete circuit sizing instantly. All NEC Article 430 tables and calculations built-in.

Download Free on App Store