1.5 Domain Weights and Study Map

The outline tells you where the points live

The current source brief gives the same domain weights for R17-N, T17-N, and G17-N. These weights do not tell you the exact questions you will see, but they do tell you how to budget study time. A candidate who spends the same number of hours on every domain is ignoring the blueprint.

The approximate item counts are calculated by multiplying 80 by the domain percentage. The exam does not have to land perfectly on a whole number for your form, but the pattern is clear. Wiring methods, branch circuits, equipment, services, and special topics deserve repeated exposure.

Convert weights into study blocks

A 40-hour study plan should not give every domain 4.4 hours. A better plan starts with the weights, then adds extra time for weak areas. For a first pass, try this allocation:

Do not make the mistake of studying only the largest domain. A close score can turn on feeders, control devices, or general knowledge. Smaller domains are often efficient because a few article maps and practice sets can recover several points.

Domain-to-NEC route map

The exam outline uses broad categories, while the NEC is organized by articles, chapters, tables, and definitions. Build bridges between the two.

Calculation setup by domain

Some domains are lookup-heavy. Others are calculation-heavy. Your plan should include both.

Branch-circuit and feeder problems often start with load in VA or amperes. Wiring-method problems may require box fill, conduit fill, or ampacity adjustment. Motor questions often require using NEC motor full-load current tables instead of the equipment nameplate for certain calculations.

Core formulas to recognize:

amperes = watts / volts

VA = volts x amperes

three-phase VA = volts x amperes x 1.732

continuous load sizing = load x 125% when the rule requires it

adjusted ampacity = base ampacity x correction factor x adjustment factor

The exam trap is usually not multiplication. It is choosing the wrong base value. If the question asks for conductor ampacity, you may need Article 310 and adjustment factors. If it asks for overcurrent protection, you may need Article 240 or a motor-specific rule. If it asks for a service or feeder load, Article 220 may control.

Use the local practice bank intelligently

The local practice bank has 200 journeyman-electrician items. Its current category counts are uneven: definitions are high, control devices are low, and renewable energy appears even though the ICC outline uses the broader special equipment and conditions frame.

Use the bank as a workout, not as a perfect exam blueprint. Map each practice category back to the ICC domain weights.

Weekly study map

A practical week should mix reading, lookup, and timed questions. Do not wait until the final week to practice timing.

• Day 1: Wiring methods article map plus conduit or box-fill drills.
• Day 2: Branch circuits and conductor sizing questions.
• Day 3: Services, grounding, and bonding routes.
• Day 4: Equipment, devices, and panelboard or appliance rules.
• Day 5: Motors, feeders, and control devices.
• Day 6: Special occupancies and renewable or emergency systems.
• Day 7: Timed mixed set, error log, and NEC index cleanup.

Exam trap: studying by comfort

Many candidates over-study the work they do every day and under-study unfamiliar chapters. Residential-focused candidates may skip motors or special occupancies. Commercial candidates may underestimate dwelling branch-circuit rules. Service electricians may know field fixes but still need exact NEC table navigation.

Use the weights to correct comfort bias. The exam is not asking what you usually install. It is sampling the outline.