Skip to main content
Phase Academy
ALL PATHSPATH · 02

NEC Calculation Practice

Structured practice moving from a single branch circuit to a complete service calculation. Every module works from computed results with citations to the applicable article — never reproduced tables.

LEVEL
Intermediate
TOTAL TIME
2 h 50 min · 5 modules
AUDIENCE
Student, Technician, Engineer, Contractor
VERSION
v2.0 · Published
YOUR PROGRESS0 / 5 · 0%

Progress is saved on this device. Sign in to sync it privately to your account and continue on another device.

Start path Sync privately to account

Module timeline

  1. Branch circuits and continuous loads

    Guided scenario 30 min

    Assemble a lighting and receptacle branch circuit and apply continuous-load treatment.

    Lab: General Lighting & Receptacle Branch-Circuit CalculatorCompletes on: prediction recorded, lab opened, guided scenario steps confirmed, knowledge check submitted, reflection confirmed
    Open module

  2. Dwelling unit load calculation

    Guided scenario 40 min

    Complete a standard-method dwelling calculation and explain each demand factor applied.

    Lab: Dwelling Unit Load CalculatorCompletes on: lab opened, guided scenario steps confirmed, knowledge check submitted, reflection confirmed
    Open module

  3. Commercial load buildup

    Guided scenario 40 min

    Build a commercial load with demand factors applied in the correct sequence.

    Lab: Commercial Load Build-Up CalculatorCompletes on: lab opened, guided scenario steps confirmed, knowledge check submitted, reflection confirmed
    Open module

  4. Service and feeder sizing

    Guided scenario 35 min

    Size a service or feeder from a calculated load and justify conductor and OCPD selection.

    Lab: Service & Feeder Conductor Sizing CalculatorCompletes on: lab opened, guided scenario steps confirmed, knowledge check submitted, reflection confirmed
    Open module

  5. Voltage drop check

    Guided scenario 25 min

    Validate the sized feeder against voltage drop and revise where drop governs.

    Lab: Voltage Drop Calculator & ExplorerCompletes on: lab opened, guided scenario steps confirmed, knowledge check submitted, reflection confirmed
    Open module

What you will be able to do

  • Build a branch circuit load and apply continuous-load treatment correctly
  • Perform a dwelling unit load calculation using the standard method
  • Build up a commercial load with demand factors applied in the right order
  • Size a service or feeder and defend each input
  • Check the result against voltage drop before committing to a size

Prerequisites

  • Electrical Foundations, or equivalent working knowledge of Ohm's law and three-phase basics

What counts as complete

All five modules marked complete, each requiring the guided scenario steps, the knowledge check, and the reflection prompt.

Opening a lab never marks a module complete on its own.

Recommended next path

Power Systems Analysis

One-lines, fault current, sequence networks, and bus arrangements.