CT Electrician study guide
CT Electrician · Work through your exam, one topic at a time.
The Connecticut electrician licensing examination is the credentialing step that separates a permitted apprentice or trainee from a licensed trade professional in Connecticut. Candidates typically sit for it at either the journeyman level, after accumulating supervised field hours, or at the contractor level (the E-1 unlimited and E-2 limited categories), which adds business and regulatory content to the technical material. The CT Electrician study guide has 10 sections and about 2,950 words.
01General Electrical Knowledge and Electrical Theory
Ohm's law (E = I × R) and its power forms (P = I × E = I²R = E²/R) drive nearly every calculation on this exam, so know which quantity is given and which is being asked for. Series circuits share current; parallel circuits share voltage; combination circuits reduce branch by branch.
291 words, about 1 min02Wiring and Protection
This is the largest slice of the Code: Article 210 branch circuits, 215 feeders, 220 calculations, 230 services, 240 overcurrent protection, 250 grounding and bonding, and 280/285 surge protection. Memorize 240.4(D) small-conductor limits (14 AWG = 15 A, 12 AWG = 20 A, 10 AWG = 30 A), the grounding electrode conductor sizing table in 250.66, and the equipment grounding conductor table in 250.122.
246 words, about 1 min03Wiring Methods and Materials
Chapter 3 tells you which wiring method is legal where, and how to support, bend, and fill it. Know NM cable (Article 334), AC and MC cable (320 and 330), EMT (358), IMC (342), rigid metal conduit (344), PVC (352), LFMC and LFNC (350 and 356), and boxes (314).
277 words, about 1 min04Equipment for General Use
Articles 400 through 480 cover the equipment you install every day: flexible cords (400), switches (404), receptacles (406), switchboards and panelboards (408), luminaires (410), appliances (422), motors (430), A/C and refrigeration (440), transformers (450), and batteries (480). For motors, use 430.6 to select table values rather than nameplate current for conductor and short-circuit protection sizing; 430.22 requires branch-circuit conductors at 125% of full-load current; 430.52 sets the standard breaker at 250% of FLC for inverse-time devices; and 430.32 overload protection is set from the nameplate.
241 words, about 1 min05Special Occupancies
Articles 500 through 555 address locations where the ordinary rules bend. Classified locations (Articles 500–506) use Class I gases and vapors, Class II combustible dusts, and Class III fibers; within each class, Division 1 is the normal or frequent hazard and Division 2 is abnormal or intermittent, with the Zone system as the international alternative.
234 words, about 1 min06Special Equipment
Articles 600 through 712 cover equipment with its own rules: electric signs (600), cranes (610), elevators (620), electric vehicle charging (625), welders (630), IT equipment (645), pools and spas (680), solar photovoltaic systems (690), wind (694), fire pumps (695), energy storage (706), and microgrids (712). Photovoltaic work is tested heavily: 690.7 for maximum system voltage with temperature correction, 690.8 requiring 125% factors on current, 690.9 for OCPD, and 690.12 rapid shutdown, which requires the conductors inside a building to drop to 30 V or less within 30 seconds.
245 words, about 1 min07Special Conditions
Articles 700 through 770 cover systems defined by how critical they are and by how their circuits are classified. Article 700 emergency systems must supply power within 10 seconds for life safety; Article 701 legally required standby has 60 seconds; Article 702 optional standby has no Code-mandated time.
251 words, about 1 min08Communication Systems
Articles 800 through 840 cover the low-voltage wiring that shares buildings with power: communications circuits (800), radio and TV antennas (810), community antenna and cable TV systems (820), network-powered broadband (830), and premises-powered broadband (840). Focus on three themes.
238 words, about 1 min09Business Management, Estimating, and Plan Reading
This domain tests the business side of contracting: licensing, contracts, insurance, employment, liens, and permits. In Connecticut, electrical work must be performed under a licensed electrical contractor, with unlimited and limited contractor and journeyperson licenses available.
688 words, about 3 min10Safety Practices and Connecticut Electrical Regulations
Safety questions draw on NFPA 70E and common-sense field practice: de-energize, lock out and tag out, verify the absence of voltage with a tested meter, and only then work. Know the shock approach boundaries (limited, restricted, prohibited), the requirement for arc-rated PPE and incident-energy awareness, insulated gloves for work inside the restricted boundary, and the minimum approach distances.
239 words, about 1 min