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.

Outdoor Receptacle Requirements NEC: GFCI, Covers & Placement Rules | Ampora

GFCI Protection Requirements

Per NEC 210.8(A)(3), GFCI protection is required for all 125-volt through 250-volt receptacles installed outdoors at dwelling units. This includes both 15-amp and 20-amp circuits, and applies regardless of the location or type of cover installed.

NEC 210.8(A)(3) - Dwelling Unit Outdoor GFCI

All outdoor receptacles at dwelling units require GFCI protection
Applies to 125V-250V, 15A and 20A receptacles
Includes receptacles under eaves, on porches, in garages with outdoor access
No exceptions for height or location (all outdoor receptacles, period)

GFCI Protection Methods

GFCI protection can be provided by:

GFCI receptacle: Most common for outdoor use - visible test/reset buttons
GFCI circuit breaker: Protects entire circuit from panel
GFCI dead-front: Where only GFCI protection needed, no outlet
Upstream GFCI: Inside outlet can protect outside outlet on load terminals

NEC 2020 Change: 250V Receptacles

The 2020 NEC expanded outdoor GFCI requirements to include 250V receptacles (previously only 125V). This means outdoor 240V receptacles now also require GFCI protection.

Weatherproof & In-Use Covers

NEC 406.9 specifies cover requirements for outdoor receptacles. The type of cover required depends on whether the receptacle is in a wet location or damp location.

Cover Type Requirements

Location Type	Cover Required	NEC Reference
Wet Location	In-Use (Extra Duty) Cover	406.9(B)(1)
Damp Location	Weatherproof Cover (when closed)	406.9(A)
All 15A/20A Outdoor	Weather-resistant receptacle type	406.9(A)

Understanding In-Use Covers

In-use covers (also called "bubble covers" or "extra duty covers") provide protection while a cord is plugged in. Key features:

Rated for "wet location while in use"
Larger enclosure allows cord entry while maintaining seal
Gasket or flap seals around cord
Required in wet locations per NEC 406.9(B)(1)

Pro Tip: When in Doubt, Use In-Use

Many inspectors prefer in-use covers for all outdoor receptacles, even in damp locations. The cost difference is minimal, and they provide better protection for homeowners who may leave items plugged in during rain.

Weather-Resistant Receptacles

Per NEC 406.9(A), all 15A and 20A, 125V and 250V outdoor receptacles must be listed as "weather-resistant" (marked "WR" on the receptacle). This applies in addition to cover requirements.

Placement Requirements

NEC 210.52(E) specifies minimum outdoor receptacle requirements for dwelling units.

NEC 210.52(E) - Outdoor Outlets Required

Front: At least one receptacle at the front of the dwelling
Back: At least one receptacle at the back of the dwelling
Grade-level access: Each floor with direct grade-level access requires an outdoor receptacle
Balconies: Balconies, decks, and porches accessible from inside need a receptacle if usable space > 20 sq ft

Balcony and Deck Requirements

Per NEC 210.52(E)(3), outdoor receptacles are required for:

Balconies, decks, and porches accessible from the dwelling interior
Applies when usable area is 20 square feet or more
Receptacle must be accessible from the balcony/deck/porch
GFCI protection required per 210.8(A)(3)

Wet vs Damp Locations

Understanding the difference between wet and damp locations is critical for proper cover selection.

Wet Locations

Subject to saturation with water:

• Directly exposed to weather (no overhead protection)
• In direct path of sprinklers
• Areas routinely washed down
• Underground or in contact with earth

Requires In-Use Cover

Damp Locations

Partially protected from weather:

• Under eaves or overhangs
• Covered porches
• Roofed patios
• Areas protected from direct rain

Weatherproof Cover OK

Practical Tip: The Rain Test

Ask yourself: "Will this receptacle get wet during a rain storm?" If the answer is yes (even occasionally), treat it as a wet location and install an in-use cover. Covers under roof overhangs may still be wet locations if wind-driven rain can reach them.

Height & Mounting Requirements

While the NEC doesn't specify a required height for outdoor receptacles, practical considerations and local codes often dictate mounting heights.

Recommended Heights

Standard exterior wall: 18-24 inches above finished grade
Under eaves/protected: 12-18 inches may be acceptable
Flood-prone areas: Higher mounting recommended (check local codes)
ADA accessible: 15-48 inches above floor/grade

Mounting Considerations

Mount boxes level with face perpendicular to grade
Use weatherproof boxes rated for the location
Ensure proper drainage - boxes shouldn't collect water
Consider accessibility for lawn equipment, holiday lights, etc.

Commercial Requirements

Commercial outdoor receptacle requirements differ slightly from residential per NEC 210.63 and 210.8(B).

Commercial GFCI Requirements - NEC 210.8(B)

Outdoors: All outdoor receptacles (public space)
Sinks: Within 6 feet of any sink
Kitchens: Commercial kitchen receptacles
Rooftops: Receptacles on rooftops
Garages: Service bays and similar areas

HVAC Equipment Receptacles

Per NEC 210.63, a 125V, 15A or 20A receptacle is required at HVAC equipment on rooftops and in attics for servicing. These receptacles must be:

Within 25 feet of the HVAC equipment
On the same level as the equipment
GFCI protected (when outdoors or on rooftop)

Common Mistakes to Avoid

Frequently Cited Violations

Wrong cover type: Using standard weatherproof cover in wet location. In-use covers required in wet locations.
Missing GFCI: All outdoor receptacles at dwellings require GFCI - no exceptions for height or location.
Non-WR receptacle: Outdoor receptacles must be weather-resistant type (marked "WR").
Cover not rated: Cover must be listed for the environment (wet location, in-use rated).
Missing front/back outlet: Dwellings require at least one outdoor receptacle at front AND back.
Deck/balcony missing outlet: Usable outdoor spaces over 20 sq ft need a receptacle.

Pre-Inspection Checklist

✓GFCI protection for all outdoor receptacles
✓Weather-resistant (WR) receptacles used
✓In-use covers in wet locations
✓Weatherproof covers in damp locations (minimum)
✓One receptacle at front of dwelling
✓One receptacle at back of dwelling
✓Receptacle for decks/balconies over 20 sq ft
✓Weatherproof boxes properly sealed

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