Free · No signup

Construction reference charts for the field.

The code tables you actually look up on the job — wire ampacity, conduit fill, rebar sizes, pipe schedules. Clean, mobile-friendly, no signup. Built by a licensed electrical contractor.

Construction reference charts for the field.

⚡ Electrical

Wire Ampacity (NEC 310.16) Explained →

Sizing Wire for a Breaker →

Conduit Fill (NEC Ch. 9) Explained →

Motor FLC (NEC 430.248/250) Explained →

NEMA Enclosure Types Explained →

Electrical Labor Units Chart →

Sizing the EGC (NEC 250.122) →

Sizing the GEC (NEC 250.66) →

Standard OCPD Sizes (NEC 240.6) Explained →

Applying Ampacity Correction Factors →

Burial Depth (NEC 300.5) Explained →

Reading NEMA Plug & Receptacle Numbers →

Motor Branch-Circuit Protection (NEC 430.52) →

Motor Locked-Rotor Code Letters (430.7(B)) →

NEMA Motor Starter Sizes (ICS 2) →

Transformer Overcurrent Protection (450.3) →

Max PV System Voltage (NEC 690.7(A)) →

Bonding Jumpers & SSBJ (NEC 250.102(C)(1)) →

Dwelling Service 83% Rule (NEC 310.12) →

Wire Insulation Types (NEC 310.4) →

Free Air Ampacity (NEC 310.17) →

Flexible Cord Ampacity (NEC 400.5) →

NEC Ch. 9 Tables 4 & 5 + Annex C Explained →

NEC Ch. 9 Tables 8 & 9 (Resistance/Reactance) →

Conduit Support Spacing & PVC Expansion →

Box Fill Rules (NEC 314.16) →

NFPA 70E Approach Boundaries (130.4(E)) →

NFPA 70E Arc Flash PPE Categories →

NESC Clearances (232-1, 234-1, 235-5) →

Insulation Resistance Testing (IEEE 43) →

IEEE Grounding & Power Standards Explained →

Working Space (NEC 110.26 / 110.34) →

General Lighting Load (NEC 220.42/220.45) →

Cooking Appliance Demand (NEC 220.55/220.56) →

Multifamily Optional Calc (NEC 220.84) →

Receptacle Rating Rules (NEC 210.21/210.23) →

Hazardous Areas: API RP 500 vs 505 →

AWG ↔ mm² ↔ cmil + Wire Weights →

Cable Pulling Tension & Sidewall Pressure →

🦺 Safety (OSHA)

OSHA Soil Types & Sloping (Table B-1) →

Crane Power Line Clearance (1926.1408) →

OSHA Silica Table 1 (1926.1153) →

OSHA Minimum Approach Distance (1926.960) →

OSHA Fall Protection Requirements (Subpart M) →

OSHA Ladder Requirements (1926.1053) →

🏢 Building & Fire Codes

Allowable Height & Area (IBC 504/506) →

Fire-Resistance Ratings (IBC 601/602/716) →

Occupant Load Factors (IBC 1004.5) →

IBC Egress: Exits, Travel & Corridors →

Live Loads & Plumbing Fixtures (IBC) →

Reading IRC R301.2 & R302.1 Tables →

IRC Footing Sizes (R403.1) Explained →

Reading IRC Joist & Rafter Span Tables →

IRC Deck Framing (R507) Explained →

IRC Wall Framing, Headers & Nailing →

NFPA 13 Sprinkler Design Explained →

NFPA 72 Fire Alarm Design Explained →

NFPA 14, 30 & 780 Explained →

🚰 Plumbing & Mechanical

Ventilation Rates (IMC / ASHRAE 62.1) →

Duct Construction (IMC 603 / SMACNA) Explained →

IECC Insulation R-Values & Climate Zones →

Minimum Plumbing Fixtures (IPC 403.1) →

Water Supply Pipe Sizing (IPC 604 & WSFU) →

Drain Sizing with DFUs (IPC 709.1/710.1) →

Plumbing Vent Sizing (IPC 906.1) →

Pipe Hanger Spacing & Storm Drain Sizing →

Gas Pipe Sizing Tables (IFGC 402.4) →

🏗️ Structural & Concrete

ACI 318 Cover & Development Length →

AISC Steel Shapes & Bolts Explained →

AWS D1.1 Fillet Weld Size & Visual Inspection →

ASCE 7 Wind, Snow & Seismic Explained →

🧱 Concrete

Rebar Sizes & Weights Explained →

Concrete PSI & Mix Ratios Explained →