READY TO WIRE?
Bonding Jumper Sizing
Sizing for supply-side, main, and system bonding jumpers based on largest ungrounded conductor.
Equipment Grounding Conductors
Minimum EGC sizes based on overcurrent protection rating. Includes proportional increase rules.
Grounding Electrode Conductor (GEC) - Standardized Parallel Rules
Sizing for service grounding electrodes, water pipes, and structural steel connections.
Minimum Burial Depth
Fast reference for common residential and commercial trench depths and cover rules.
Minimum Cover Requirements
Comprehensive cover requirements for all wiring methods and locations (0 to 1000 Volts).
Temp Correction (30°C)
Multipliers for ampacity based on ambient temperature variations.
Wire Adjustment Factors
Mandatory derating factors for raceways containing more than three current-carrying conductors.
Conductor Ampacities
High-speed reference for common Copper and Aluminum wire sizes (60°C to 90°C).
Allowable Ampacities
The master NEC ampacity table for all insulated conductors and terminal temperature ratings.
Metal Box Fill Capacities
Maximum conductor counts for standard square, switch, and handy metal boxes.
Volume Allowance
Per-conductor cubic inch volume requirements used for calculating non-standard box fill.
EMT Dimensions & Fill
Internal area and 40% fill capacity for Electrical Metallic Tubing (EMT).
PVC Schedule 40 Fill
Area and conductor capacity specifically for Rigid PVC Schedule 40 raceways.
PVC Schedule 80 Fill
Capacity limits for heavy-wall Schedule 80 PVC (accounts for reduced internal area).
RMC Dimensions & Fill
Internal dimensions and wire fill limits for Rigid Metal Conduit (RMC).
Conductor Properties
Resistance and reactance values for voltage drop math and stranded conductor areas.