Master Electrician study guide
Master Electrician · Work through your exam, one topic at a time.
A Master Electrician license is the highest tier of electrician credential issued by state or local licensing boards in the United States. Where a journeyman license authorizes hands-on installation work under supervision, the master tier typically authorizes the holder to design and supervise installations, pull permits, sign contracts for electrical work, and in many jurisdictions to own or qualify an electrical contracting business. The Master Electrician study guide has 10 sections and about 2,763 words.
01General Electrical Knowledge, Theory, and Definitions
Candidates must move fluently between Ohm's law, power relationships, and AC circuit behavior. Know that in a series circuit current is common and voltage divides; in parallel, voltage is common and current divides.
258 words, about 1 min02Wiring Methods, Materials, and Installation Practices
Know the common wiring methods and where each is permitted: NM cable in dry interior locations, MC and AC cable with appropriate fittings, EMT, IMC, RMC, PVC, LFMC, and LFNC. Understand wet, damp, and dry location definitions, corrosion protection, and the difference between support and securing requirements.
278 words, about 1 min03Branch Circuits, Feeders, and Load Calculations
Branch-circuit calculations begin with the load type: general lighting, small-appliance, laundry, receptacle, appliance, motor, or HVAC. Dwelling general lighting is typically 3 VA per square foot; small-appliance and laundry circuits are 1,500 VA each.
296 words, about 1 min04Overcurrent Protection and Short-Circuit Coordination
Overcurrent protective devices protect conductors and equipment from overloads and short circuits. Distinguish overload protection, which is often thermal, from short-circuit and ground-fault protection, which is magnetic or current-limiting.
284 words, about 1 min05Grounding, Bonding, and Ground-Fault Protection
Grounding establishes a reference to earth; bonding connects metal parts to form an effective fault-current path. Know the grounded conductor (neutral), equipment grounding conductor (EGC), grounding electrode conductor (GEC), main bonding jumper, system bonding jumper, and grounding electrode system.
279 words, about 1 min06Services, Service Equipment, and Panelboards
Service-entrance conductors run from the service point to the service disconnecting means. Know overhead service drop clearances, underground service lateral depths, service mast requirements, and the location of the service disconnect nearest the point of entry.
289 words, about 1 min07Motors, Motor Controls, Generators, and HVAC Equipment
Motor calculations use the tables for full-load current, not the nameplate FLA, for conductor and short-circuit protection sizing; nameplate values are used for overload protection. Branch-circuit conductors are generally 125% of the table FLC, the short-circuit and ground-fault protective device may be sized up to specified percentages, and the overload device protects the motor from overheating.
288 words, about 1 min08Transformers and Power Distribution Systems
Transformers transfer energy by induction and change voltage in proportion to turns ratio. Primary and secondary currents follow the inverse voltage ratio, and kVA is approximately conserved minus losses.
274 words, about 1 min09Special Occupancies, Special Locations, and Special Equipment
Special occupancies include hazardous (classified) locations, health care facilities, places of assembly, commercial garages, agricultural buildings, marinas, and pools. Hazardous locations are classified by class, division or zone, and gas or dust group; equipment must be listed for the specific atmosphere.
260 words, about 1 min10Electrical Safety, Code Administration, and Plan Review
Electrical safety begins with recognizing shock and arc-flash hazards, establishing approach boundaries, and using PPE and insulated tools. Electrical safe-work concepts include qualified persons, energized-work permits, lockout/tagout, and incident-energy analysis.
257 words, about 1 min