Special installations practice set

Four weeks before her exam, Priya sits a timed practice set on the specialized sections: motors, transformers, capacitors, hazardous locations, life safety systems, healthcare, pools, generators, solar and storage, and EV charging. Denise built it from the study group's own job files, so every question is realistic, and she times it at the pace of the real exam: about 90 seconds per question on average, which means quick lookups for the easy ones to save time for the calculations. This lesson walks through the set as Priya works it, with the strategy she uses, the lookups she makes, the calculations and the reasons behind each answer.

The goal is not to memorize these answers, which depend on illustrative values and on the rules as summarised here, but to practise the pattern: read the question to the end, decide which section it belongs to, decide whether it is a lookup or a calculation, find the rule, apply it, and check the answer for size and units. No Code text or tables are reproduced. Where a question would need a Code table value, it gives an illustrative value, as exam questions often do when they want to test method rather than lookup.

Strategy for a mixed set

Priya's first pass through the set takes about a third of the time. She answers every question she can do from memory or with a single quick lookup, marks the calculations, and skips anything that would need a long search. On the second pass, she does the marked calculations in order of how sure she is of the method. On the third pass, if time remains, she tackles the long searches. This order makes sure the easy marks are banked before the clock runs down, which matters more than any single hard question. Her lookup sheet, with a line for each specialized section and the key rule numbers, sits open beside the code book.

She also uses the section map in her head from this course. A question that mentions a capacitor goes to the capacitor rules in Section 26; one that mentions a gas or dust area goes to Section 18 or Annex J18, or Section 20 for fuel dispensing; a hospital or clinic goes to Section 24; water goes to Section 68; a generator or transfer switch goes to the interconnection and transfer rules, or Section 46 for emergency systems; solar and batteries go to Section 64 with Section 84 for the utility connection; and chargers go to Section 86 with Section 8 for the loads.

Questions 1 to 4: motors and transformers

Questions 5 to 7: capacitors and hazardous locations

Questions 8 to 10: life safety and healthcare

Questions 11 to 13: pools and generators

Questions 14 to 16: solar, storage and EV

Reviewing the set

Priya scores 15 out of 16 on her first timed attempt. The one she misses is question 5: she started from 300 kVA instead of 234 kW, the same trap Tyler fell into weeks earlier. Denise's comment is that a mistake you have already made once is the easiest kind to fix: she adds a line to her checklist, "kVA given? Multiply by pf first", and gets it right on the next mock. Her time is 21 minutes for 16 questions, a little over the 90-second average, mostly spent on the cold-voltage calculation and the capacitor question. She practises those two patterns until each takes under two minutes.

Marcus scores 13, missing the healthcare questions and one pool question, all areas he has never worked in. Tyler scores 10, which Denise says is excellent for a third-year apprentice and a sign that he is learning the Code's structure early. The group's shared lesson is that the specialized sections are less about deep knowledge than about recognizing which section a question belongs to and knowing the handful of rules that section always tests.

import math
answers = {
    'Q1 feeder A': 1.25 * 65 + 27 + 14,
    'Q2 overload A': 1.15 * 41,
    'Q3 losses kW': 90 / 0.982 - 90,
    'Q5 kvar': 300 * 0.78 * (math.tan(math.acos(0.78)) - math.tan(math.acos(0.95))),
    'Q8 Ah': 54 / 6 * 0.5,
    'Q11 A': 1.25 * 48,
    'Q12 A': 150 / 0.8 * 1000 / (math.sqrt(3) * 600),
    'Q14 V': 16 * 51 * (1 + 0.0028 * 65),
    'Q16 A': 1.25 * 80000 / (math.sqrt(3) * 208),
}
for k, v in answers.items():
    print(f'{k:16s} {v:8.2f}')

Q1 feeder A        122.25
Q2 overload A       47.15
Q3 losses kW         1.65
Q5 kvar            110.82
Q8 Ah                4.50
Q11 A               60.00
Q12 A              180.42
Q14 V              964.51
Q16 A              277.57

The script checks the arithmetic of the calculation questions. Change a value and rerun it to make your own variations, then time yourself.

Building your own practice questions

The best practice questions come from your own work. Denise asks each member of the study group to write three questions a week from jobs they have done or seen, in the same pattern as the set: a short scenario, a question with one right answer, and a one-line explanation with the rule number. Writing a question forces you to find the rule and read it closely, which is better study than answering someone else's question. Priya writes one from the Riverbend parkade about the managed feeder, one from the clinic about the double-bonded transformer, and one from the Hartley dryer about overload settings with a capacitor at the motor. Marcus writes one about a 600 V motor control centre in a Zone 2 area at a plant, which forces the group to combine Section 28 and Section 18 in one answer.

Mixing sections in one question is how the hardest exam questions are built. A pool pump in a hazardous location is unlikely, but a motor in a dusty grain building, a generator feeding a fire pump, or an EV charger in a parkade with a fire alarm system are all real combinations. When a question mixes topics, take each part to its own section and answer them in turn, then check that the answers fit together. Priya's last week of study is mostly mixed questions, timed, with her lookup sheet as her only aid apart from the code book.