Changes in the 2024 edition

Every new edition of the Code brings changes, and exam writers love them. A changed rule tests whether a candidate studied the current edition or relied on old habits, old notes and old practice questions. This lesson does two things. It shows you how to find and study the changes in any edition, a skill you will use every three years for the rest of your career. And it walks through the main changes in the 26th edition, the 2024 Code, so you know where to concentrate.

As always, this lesson describes changes in general terms and names the sections and tables involved. Read the actual rules in your own copy. The point is to know where to look, not to replace the Code.

How the Code shows what changed

The Code identifies changed text so that users can see what is new. The front matter of your copy explains how revisions are indicated, typically with a mark in the margin beside rules, subrules or tables that have changed since the previous edition. Find that explanation in your copy and learn the symbol. Then flip through the sections you use most and notice how many marks there are. It gives you a quick sense of which areas have moved.

Margin marks show that something changed, but not how much. A mark might indicate a reworded phrase with no practical effect or a completely new requirement. To understand a change, read the new rule carefully and, if you can, compare it with the previous edition. Many training providers and industry publications summarize the changes, and the CE Code Handbook explains the reasoning behind many of them. Use those summaries to guide your reading, but rely on the Code text itself for answers.

A method for studying changes

Changes are best studied systematically. Start with a reliable summary to get the list. Then, for each change, read the new rule in full, identify what it requires that the old rule did not, and think of an installation where the change makes a difference. Write a one-line note for each in your study notebook. Finally, check your province's adopting regulation for any amendment that affects the change; occasionally a province declines to adopt a national change or modifies it.

The main 2024 changes by section

The 26th edition touched many parts of the Code. The table below lists major changes that are widely highlighted in summaries of the edition, organized by section. It is not a complete list. Use it as a map for your own reading.

Energy storage and renewables: Section 64

Section 64 received some of the largest revisions in the 2024 edition. It covers renewable energy systems and energy storage systems, and the new edition reorganized and expanded its requirements, including a new subsection specifically for residential occupancies and updated photovoltaic rules. This reflects the rapid growth of home batteries and rooftop solar. For candidates, it means that older study material on PV and battery systems may be badly out of date, and it means Section 64 is a likely source of exam questions for some years.

On the Hartley Farms job, the owner wants a 40 kW rooftop PV array with battery storage. Priya's first step is to read the scope of Section 64 and the new residential subsection to decide which parts apply to a farm shop rather than a dwelling. Her second is to check how Section 64 interacts with Section 84, which deals with interconnection of power production sources, and with Section 8 for load and supply considerations. MELC-105 covers these installations in depth.

Electric vehicle loads: Section 8

The 2024 edition revised how electric vehicle supply equipment is treated in load calculations in Section 8, and deleted Table 38. EV charging is now a common addition to homes and multi-unit buildings, and the load it adds can be large compared with the rest of a dwelling. Questions about service and feeder sizing for buildings with EV chargers, and about load management systems, are likely. Read the Section 8 rules that mention electric vehicle supply equipment, and read Section 86 for the installation rules.

Riverbend Condos wants twenty chargers in its parkade. The building's existing service has limited spare capacity, so the board is considering a load management system that shares available capacity among chargers. Whether and how the Code allows the managed load to be used in the calculation is precisely the kind of question the revised Section 8 addresses. MELC-102 works through the calculations.

Pools: Section 68

The 2024 edition added disconnecting means and bonding requirements for conductive pool infrastructure. Bonding around pools has long been a critical safety topic, because water and bare skin make people especially vulnerable to small voltage differences. The new requirements extend the bonding approach to conductive parts of the pool infrastructure. Read the new rules and note how they relate to the general bonding requirements in Section 10.

Temporary outdoor installations: Section 66

Section 66 deals with amusement parks, midways, carnivals, film and television sets, and similar temporary or travelling installations. The 2024 edition requires ground fault circuit interrupter protection for receptacles in temporary outdoor installations such as tents. It is a short change, but exactly the kind of clear yes-or-no requirement that suits an exam question.

Wording changes that trip people up

Some changes affect wording more than requirements. Removing the word allowable from most ampacity references is an example. The requirement is not lessened, but questions written for older editions may use the old phrasing, and a candidate who searches the index or the text for the old term may not find it. Similarly, a reference to Table 11 without a letter, to Table 38, or to Appendix K is a sign that a question or note predates the 2024 edition.

Priya keeps a short list of these red flags taped inside the front cover of her study notebook. When a practice question uses one of them, she knows to check whether the answer still holds under the 2024 edition before trusting the answer key.

changes = [
    ('0', 'DC voltage definitions revised'),
    ('2', 'arcing fault clearing time; IP designations'),
    ('4', 'mm2 conductors and new table'),
    ('8', 'EV supply equipment loads; Table 38 deleted'),
    ('12', 'overhead sag and span; non-metallic jacketed cable'),
    ('18', 'sealing requirements revised (with Annex J18)'),
    ('36', 'high-voltage couplers'),
    ('64', 'energy storage and renewables, residential subsection, PV'),
    ('66', 'GFCI for temporary outdoor receptacles'),
    ('68', 'conductive pool infrastructure bonding and disconnect'),
]
general = {'0', '2', '4', '6', '8', '10', '12', '14', '16', '26'}
studied = {'0', '2', '8', '64'}

for sec, what in changes:
    group = 'general' if sec in general else 'supplementary'
    mark = 'done' if sec in studied else 'to do'
    print(('Section ' + sec).ljust(11), group.ljust(14), mark.ljust(6), what)
print(len(studied), 'of', len(changes), 'sections studied')

Section 0   general        done   DC voltage definitions revised
Section 2   general        done   arcing fault clearing time; IP designations
Section 4   general        to do  mm2 conductors and new table
Section 8   general        done   EV supply equipment loads; Table 38 deleted
Section 12  general        to do  overhead sag and span; non-metallic jacketed cable
Section 18  supplementary  to do  sealing requirements revised (with Annex J18)
Section 36  supplementary  to do  high-voltage couplers
Section 64  supplementary  done   energy storage and renewables, residential subsection, PV
Section 66  supplementary  to do  GFCI for temporary outdoor receptacles
Section 68  supplementary  to do  conductive pool infrastructure bonding and disconnect
4 of 10 sections studied

When the edition changes in the middle of your study

Code editions change every three years, and exam bodies switch to the new edition on their own schedule, usually some time after the province adopts it. If an edition changes while you are studying, find out which edition your exam will use and when the exam body will switch. Buy and tab the right book. If you have already tabbed the old edition, transfer your tabs section by section and use the change list to update your notes. It is a few evenings of work, and it is much better than discovering on exam day that your book does not match the questions.

Alberta adopted the 26th edition on April 1, 2025, so candidates studying in 2026 work from the 2024 Code. The next edition is expected in 2027, and its adoption in Alberta will follow some months later. If your exam date falls near a changeover, check with the exam body which edition applies on your date.

Changes the study group noticed

When the study group compares notes on the 2024 changes, each person has noticed different things, depending on the work they do. Priya, who does a lot of residential work, has spent most time on the revised EV supply equipment load calculations in Section 8 and the new residential subsection in Section 64, because homeowners ask about chargers and batteries every week. Marcus, from industrial work, has focused on the Section 2 arcing fault clearing time requirements and the Section 18 sealing changes. Gord, who still reviews permits, mentions that the removal of the word allowable from ampacity references caused confusion in some older office templates.

Denise's point is that each of them has a blind spot where they did not look. The exam covers all of it. She asks each person to teach the group the changes they know best, so that everyone hears every change at least once from someone who has thought about it in practice. It is a good model for any study group: divide the change list by experience, then teach each other.