Rule numbers below are 2024 CEC, C22.1:24. Check them yourself - that's the drill. Q1 - B, 1.5 m. Rule 12-1010, maximum spacing of conduit supports. Subrule 1) splits it three ways: 1.5 m for 16 and 21 trade size, 2 m for 27 and 35, 3 m for 41 and larger. One rule, three numbers. If you tabbed "supports" you found it in fifteen seconds. If you went looking in the general wiring rules first, you lost a minute. Q2 - C, 14-50R, centre not more than 130 mm above the finished floor. Rule 26-744. The configuration is in Subrule 4), the height is in Subrule 6)(a). Two subrules of the same rule, and most people stop reading at the first one they find. That's why D is sitting there - right receptacle, invented height. Q3 - A, No. 6 AWG copper. Rule 10-114, Subrule 1)(a). No. 4 is the aluminum number, which is why D exists. Subrule 2) is the "unless the system conductors are smaller" part of the question - read the exception or you'll argue with the answer. Q4 - D, time-delay. Rule 28-302(2). This is the one that ate the clock, and the reason is structural: the answer isn't with the branch-circuit protection tables, it's in the motor section under overload protection, and 28-302(2) then points you at Rule 14-200 for the fuse type. Two places in the book for one motor. Navigation problem, not a knowledge problem. Q5 - A. Two rules again. Rule 2-316 is what requires the receptacle for rooftop HVAC. Rule 26-710 is what it has to be: Class A GFCI, its own branch circuit supplying no other outlets or equipment, CSA 5-20R, within 7.5 m of the rooftop equipment, not less than 750 mm above the finished roof, protected from mechanical damage. Option A matches all six. Every other option is one spec wrong - which is the trap that gets people on spec questions. You recognize the shape of the answer and stop reading. Kun went five for five in three minutes and flagged Q4 as his slowest. That's the right read. He got it right and it still cost him the most clock. The one that eats your time is your homework, not the one you missed.