Four tiers. One code edition. Whichever exam is yours – G16 Master, G17 Journeyman, G18 Residential, or G21 Low-Voltage — your prep is built on the 2017 NEC.
Each exam prep covers a different scope of the 2017 NEC. Find the path that matches your license goal and get the prep built for it.
The broadest scope. The highest bar. The license that puts permits, projects, and your business in your hands.
You’ve put in the field time. The G17 is where that experience becomes a credential and opens the door to independence.
A focused path. Targeted prep. The residential license that proves your skills on paper.
A specialized path with specialized prep. The G21 covers low-voltage systems under the 2017 NEC.
The 2017 NEC tightened several rules that show up directly on your exam. Tamper-resistant receptacle requirements were expanded to cover more replacement scenarios. GFCI protection language was clarified, including exactly how the six-foot distance from a sink is measured — a detail that trips up candidates who learned the older wording. New cable provisions were added for one- and two-family dwelling wiring, with updated marking requirements you're expected to recognize.
Here's what matters most for G-series prep: a lot of material available online defaults to the newest code, because that's what most contractors study now. That's the wrong move here. Requirements added in 2020 and 2023, including mandatory surge protection at dwelling-unit services, expanded AFCI coverage in kitchens and laundry areas, the outdoor emergency disconnect rule, aren't on your test. Study them and you're spending hours on material your exam doesn't cover, while shortchanging what's actually on it.
MCL's G-series prep is built exclusively on the 2017 NEC. Not a newer edition. Not a blend. Every drill, every practice exam, every codebook tab reflects exactly what your jurisdiction is testing right now.
The G-series is one of the most widely accepted electrician credentials in the ICC program.
Missouri runs G16 (Master) and G17 (Journeyman) statewide through the Office of Statewide Electrical Contractors (OSEC). Jefferson City utilizes the G-series as well; Kansas City tests G16 and G21 only; St. Charles County accepts G16 and recognizes both the statewide and St. Louis City licenses.
New York’s confirmed jurisdictions include the G17 for Master and Journeyman and G18 (Residential) in Rochester. West Seneca tests on the G16 (Master) and G18 (Residential).
Indiana has confirmed jurisdictions in Goshen, Bartholomew County, and Indianapolis/Marion County. They all test on the G16 (Master).
Pennsylvania's Allentown confirms the full tier set, G16, G17, G18, with Journeyman reciprocity extending to Bethlehem, Harrisburg, Kutztown, Reading, Scranton, and Connecticut.
Illinois confirms G16 in Springfield and Monroe County.
Kansas's Sedgwick County/Wichita confirms G16 Master only — Journeyman and Residential licenses use Kansas-specific codes.
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