DARK

11-in-1 AppOS

For Electricians • By Electricians

AMPSTACK

🔌 Busbar

📋NEC Exam

🔘Conduit Fill

Phases

🔢Calculations

🧱Concrete

🛠️Field Hacks

🌎Grounding

🔩Torque

📋Estimator

📓Job Journal

⚙️

Command Center
Legal, Support & Web

⚡

NEC Exam Trainer

Master every article. Pass your exam.

📚 1,000 Questions

🤖 AI Tutor

★ NEC Chapters

Random draw across all 10 chapters · state-exam style

Independent study tool. Not affiliated with NFPA.

🔘

Conduit Fill Calculator

NEC 2020 Ch. 9 · Tables 1, 4, 5

Conduit

Conduit Type Conduit Size

Nipple Rule (60% fill)

NEC 344.22 · Nipples 24" or less

Conductors

0 conductors

Ambient Temp

Temperature (°F)

---

Independent field tool. Verify against current NEC and local AHJ.
Not a substitute for professional engineering judgment.

Phase & Circuit Mapper

Map circuits · analyze imbalance

System

Voltage

Phase Legend

Lookup

Circuit Number Manual Phase Override

Assumes standard A-B-C vertical bus sequence. Verify markings on your panel before working it.

🔢

Bending Master

Hand-bender suite · EMT, IMC, RMC

Phase Material Wire Size (AWG / kcmil)

Amps

Dist (Ft)

System Voltage

Enter amps, distance, and voltage to calculate drop

Voltage (V) Current (I) Resistance (R) Power (W)

System

Voltage (V)

Power Factor (PF)

Enter ONE value below (the others will calculate)

Amps (A)

Watts (W)

kW

kVA

Notes: kVA ignores PF. For kW/W calculations, enter PF (typical motors ~0.85–0.92).

Enter voltage and either amps or watts to convert

Transformer kVA System Voltage

Enter kVA to size secondary amps

Motor HP Voltage / Phase

Pick HP and voltage/phase to pull NEC FLA

Load Amps (FLA) OCPD Type

Enter load amps to size OCPD or conductor

Breaker / Fuse Rating (Amps)

Conductor Material

Termination Temp Rating

CONTINUOUS LOAD (×125%)

APPLY “SMALL CONDUCTOR” CAP (Cu #14/#12/#10)

Field helper only. Verify derating, terminations, and your adopted NEC edition.

Enter breaker rating to find min conductor

Main Breaker / Feeder OCPD (Amps)

Conductor Material

Termination Temp Rating

CONTINUOUS LOAD (125%)

DWELLING SERVICE/FEEDER (83% · NEC 310.12)

Enter feeder OCPD to size home feeder conductor

Box Volume (cu in) Conductors

#14

#12

#10

#8

#6

Equipment Grounds?

Device Yokes

Internal Clamps Present (adds 1)

Enter box volume and conductor counts for fill

Dwelling Info

Living Area (sq ft)

Service Voltage

Small-Appl Branches (≥2)

Laundry Branches (≥1)

Service Conductor Material

Fixed Appliances (VA)

Dishwasher

Disposal

Microwave

Water Heater

Other Fixed #1

Other Fixed #2

NEC 220.53 · 75% demand factor applied when 4 or more fixed appliances are on the feeder.

Cooking · Dryer

Range — nameplate kW

Wall Oven/Cooktop kW

Clothes Dryer — nameplate VA (min 5000)

Range per NEC 220.55 Col C. Dryer per NEC 220.54.

HVAC · EV

Heat load (VA)

A/C load (VA)

EV Charger (VA, min 7200 per 220.57)

HVAC noncoincident per NEC 220.60. EV per Art. 625 & 220.57.

Fill the dwelling form to calculate service load

Bend Type

Conduit

Standard deduct/take-up values for Klein/Ideal-style hand benders.

Desired Stub Height (in)

Hook bender arrow to stub height minus take-up. Bend toward you.

1st Stub Height (in) Back-of-Bend to Back-of-Bend (in) 2nd Stub Height (in)

Offset Depth (in)

Bend Angle

Distance between bends = depth × multiplier. Shrink subtracts from overall run.

Obstacle Height (in)

Center Bend Angle

Distance from Start of Pipe to Obstacle Center (in)

Center bend sits over the obstacle. Shoulder bends are half the center angle, each an equal distance from center.

Obstacle Height (in)

Bend Angle

Obstacle Width (in)

Two parallel offsets stepping over and back down. Center section runs parallel to obstacle top.

Rise (in)

Roll / Side Shift (in)

Bend Angle

True offset = √(rise² + roll²). Angle to roll the pipe = arctan(roll / rise).

Stub Height (in)

Kick Offset (in)

Kick Angle

Standard 90° stub-up plus a kick (offset) near the foot to clear an obstacle or hug a wall.

Total Bend Angle

Number of Segments

Desired Bend Radius (in)

Large-radius sweeps made from several small bends. Each segment is equal angle, spaced evenly on the pipe.

Enter dimensions to calculate bend marks

Field Reference

Take-Up (deduct)

EMT 1/2"5"

EMT 3/4"6"

EMT 1"8"

EMT 1-1/4"11"

IMC 1/2"6"

IMC 3/4"8"

IMC/RMC 1"11"

Offset Multipliers

10°6.0×

22.5°2.6×

30°2.0×

45°1.4×

60°1.2×

3-Pt Saddle (shoulder / center / mult)

22.5° set11.25° / 22.5° / 2.6×

30° set15° / 30° / 2.5×

45° set22.5° / 45° / 2.0×

Arrow = hook mark → use for stub and 1st bend of back-to-back.

Star / notch (back-of-bend) → use for 2nd bend of back-to-back.

Center dot → use for center of saddles.

Klein/Ideal values. Other brands may vary – confirm against your bender markings.

🧱

Concrete

Trench · Pole · Slab · yd³ + bags + cost

Trench

Pole / Footing

Slab (Multi)

Length (ft)

Width (in)

Depth (in)

Waste %

Preferred Bag (for cost)

Bag Price ($)

CONDUIT IN TRENCH

Enter trench dimensions to calculate volume

Diameter (in)

Depth (in)

Quantity

Waste %

Preferred Bag (for cost) Bag Price ($)

Enter pole dimensions to calculate volume

Waste % (applies to total)

Preferred Bag (for cost)

Bag Price ($)

Slabs

Add a slab to calculate volume

🛠

Field Hacks

Tools no one thinks about · until they need them

Pipe Marker

Open the section to load satellite map and GPS.

📷Attach Photo (optional)Tap to take a photo or choose from library

Normal save uses live GPS. Enable Tap-to-Pin only when you want to place a pin by tapping a custom point on the map.

Find Pin

📍

No active target

Tap Find on a saved pin below to navigate to it.

Saved Pins

Spool Calculator

Material

COPPERALUMINUM

Wire Size Spool Length

Ohms per 1000 ft @ 20°C (editable)

Actual Conductor Temp (°C)

Measured Resistance

💡 Most meters show mΩ on low-resistance reads (like spool checks). If your meter shows "7" or "12" — that's milliohms.

Loop Test (out & back = 2 conductors)

OFFON

How this works

Wire table values are treated as DC resistance at 20°C. Temp correction uses actual conductor temperature, not insulation rating. Leave Loop Test OFF for a normal end-to-end spool check. Turn Loop Test ON only when you twist both far ends together and read Ω out + back.

Survey Helper

Station

—

Use station format like 10+25, 10+25.5, or 0+75.

Total Feet

—

Enter total feet and convert it to station format.

Station AStation B

—

Midpoint Station

—

Starting Station

Operation

Feet

—

Search Abbreviations

Decimal ↔ Tape

Decimal FeetSnap Fraction

Tape Measure

—

Tape Measurement

Decimal Feet

—

Field Measure

Add / Subtract

Operation First Measurement

Second Measurement

—

Convert to Total Inches

—

Fraction → Decimal

Fraction (example: 3/8)

—

Decimal → Fraction

Decimal (example: 0.375)

—

Panel Organizer

Upload a panel photo, build a paired left/right schedule, then print or save it. Multi-pole breakers reserve the next spaces on the same side automatically.

Panel Name

Main Breaker

Panel Size

Panel Photo 📷 Upload Panel Photo Tap to take a photo or choose from library

Photo Preview

🖼

No photo yet

Uploaded photo will preview here.

Panel Schedule

📋

No schedule built yet

Fill in the info above and tap Build Schedule.

Print lets you print or save as PDF. Save to Files downloads a clean HTML copy of the current schedule with the photo and your typed labels.

🌎

Grounding & Bonding

NEC-driven sizing for every ground you pull

EGC

GEC

MBJ

Supply-Side

SDS

Ground Rods

Breaker / Fuse Size (Amps)

EGC Material

Parallel Feeders?

NEC 250.122

How this works

Sizes the equipment grounding conductor (EGC) from the upstream breaker or fuse rating per NEC 250.122. If feeders are paralleled, the EGC is sized up by circular-mil area so each parallel set carries a correctly sized ground. Always verify against the equipment label and any local amendments.

⚡

No result yet

Enter the breaker or fuse amps above to size the EGC.

Largest Service Wire Size

GEC Material

Electrode Type

Parallel Service Conductors?

NEC 250.66

How this works

Sizes the grounding electrode conductor (GEC) from the largest ungrounded service conductor per NEC 250.66, then applies electrode-specific minimums and caps. Rod, pipe, and plate electrodes cap at #6 CU. Ufer (concrete-encased) and ground-ring electrodes have their own minimum sizes. Parallel services are handled by summing circular-mil area first.

⚡

No result yet

Pick the service wire size and electrode type above.

Largest Service Wire Size MBJ Material NEC 250.28(D)

How this works

The main bonding jumper (MBJ) connects the service-neutral to the equipment ground at the service disconnect. Per NEC 250.28(D), MBJ sizing follows the same table as the GEC and is based on the largest ungrounded service conductor. For services over 1100 kcmil copper or 1750 kcmil aluminum, size per 12.5% of the largest phase area.

⚡

No result yet

Pick the service wire size and material above.

Largest Supply-Side Wire Size

Bonding Jumper Material

Parallel Feeders?

NEC 250.102(C)

How this works

Supply-side bonding jumpers live between the service neutral and enclosures ahead of the service disconnect (like meter cans and CT cabinets). Per NEC 250.102(C), they're sized from the largest ungrounded supply-side conductor using the GEC table, then upsized proportionally for parallel runs based on circular-mil area.

⚡

No result yet

Pick the supply-side wire size and material above.

Largest Derived Phase Conductor

Material

Parallel Derived Conductors?

NEC 250.30

How this works

Separately derived systems (transformers, on-site generators, some UPS units, solar inverters with their own neutral) need two conductors per NEC 250.30. The System Bonding Jumper (SBJ) bonds X0 to the enclosure and is sized per Table 250.102(C)(1). The SDS Grounding Electrode Conductor runs to the nearest effective electrode and is sized per Table 250.66. Both are sized from the largest derived ungrounded conductor. Parallel derived phases are summed by circular-mil area first.

⚡

No result yet

Pick the derived phase conductor size and material above.

Measured Ground Resistance (Ohms)

Rods Installed

Rod Spacing

NEC 250.53(A)(2)

How this works

The 25-ohm rule: if a single rod electrode reads over 25 ohms to ground, NEC 250.53(A)(2) requires a supplemental electrode. Most installations default to two rods regardless of test results, which satisfies the rule without measuring. Rods must be at least 6 feet apart (8 ft is typical). This tool compares your measured resistance and rod count against the rule.

⚡

No result yet

Enter your measured ohms and rod count above.

🔧

Torque

Field averages when the label's missing or rubbed off

Termination Type

Wire / Conductor Range

Display units: lb-ft

NEC 110.14(D)

How this works

NEC 110.14(D) requires every termination to be torqued to the manufacturer's spec. If the equipment, lug, or connector has a printed value, that wins — always. This tool exists for the moments when that label is missing, rubbed off, or too small to read in the field. Values shown are industry field averages with a ± 10% typical range. Bolt torque also shifts with lubrication, plating, and washers, so treat these as planning guidance only.

🔧

No torque value yet

Pick a termination type and wire size above.

📋

Estimator Pro

Build pro-looking quotes in 60 seconds

⚡ Pro Mode • Full Breakdown

Company / Your Name

Customer / Job

Customer Phone

Quote Date

Scope of Work

$ / Hour

Markup %

Trip / Service Fee

Permit Allowance

Sales Tax % (Materials)

Apply Tax

Show Profit on Customer Quote

Internal only. Keep OFF when sharing.

Line Items

0 items

Electrical Quote

Job: —

Quote ID: —

Date: —

PRO QUOTE

⚡ Final Total

$0.00

Material $0.00

Labor $0.00

Extras / Tax $0.00

Profit $0.00

📋 Scope of Work

(see onsite notes)

⚡ Valid for 30 Days

Estimate only. Final pricing may change due to site conditions, permit requirements, AHJ, and material market changes.

+ Add Work

📁 Quote History

⚙️

Command Center

Account, billing, legal, and support — all in one place.

⚡ Account

👤

Welcome, Sparky

@your_handle

FREE

📅 Certification

💳 Billing

📋 Legal

💬 Support

🌐 Website & Social

ℹ️ About

⚡

App Version

AmpStack v4.45 · Busbar beta

⚠️ Danger Zone

📓

Job Journal

Daily logs, photos, customer notes — never lose a job detail again.

0

Active

0

Completed

0

Entries

NEC Exam Trainer

Conduit Fill Calculator

Phase & Circuit Mapper

Bending Master

Concrete

Field Hacks

Pipe Marker

Find Pin

Saved Pins

Spool Calculator

Survey Helper

Decimal ↔ Tape

Field Measure

Add / Subtract

Convert to Total Inches

Fraction → Decimal

Decimal → Fraction

Panel Organizer

Photo Preview

Panel Schedule

Grounding & Bonding

Torque

Estimator Pro

+ Add Work

📁 Quote History

Command Center

Job Journal

Job Name