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Code Conundrum April 2021

Tackle the Code Conundrum... if you dare!



May 1, 2021 – Welcome to the newest round of Code Conundrum questions, which test your knowledge of the Canadian Electrical Code (CE Code) Part I, plus answers to February 2020’s questions (below)! Answers to these new questions in our May 2021 edition.

QUESTION 1

Equipment marked Ex ia Gb is suitable for installation in Zone 0 locations:

a) True
b) False

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QUESTION 2

The ampacity of conductors in a bundle of 11 copper eight-conductor cables No. 26 AWG marked 75 C is:

a) 1 A
b) 0.8 A
c) 0.5 A
d) None of the above

QUESTION 3

An alternating current system is permitted to be ungrounded when:

a) equipped with suitable ground fault detection.
b) maintained by qualified persons.
c) A and B.
d) None of the above. Grounding is required for all alternating current systems.


ANSWERS from our February 2021 ed.

Question 1 – In a hospital, when an electric vehicle energy management system (EVEMS) is installed to monitor the consumer’s service loading, and to control the supply to electric vehicle supply equipment (EVSE), the demand load of this EVSE is:

a) 100% of the sum of all EV chargers
b) 90% of the sum of all EV chargers
c) As per Table 38
d) Ignored from the demand calculation of the hospital – CORRECT. Rules 8-206, 8-106(11), CE Code 2021.

Question 2 – For a 400A fusible disconnect switch fused at 400A, fed with a multi-conductor 600-kcmil copper in a raceway, marking is required beside the fused disconnect switch to state the maximum permitted continuous load is:

a) 320 A
b) 336 A
c) 268.8 A
d) None of the above – CORRECT. Rule 2-100(4), CE Code 2021.

Question 3 – A single-conductor cable, carrying a current more than ___ amperes shall be run and supported in such a manner that the cable is encircled by ferrous material at all points of support, and at points of entry to enclosures.

a) to isolate utility feeders.
b) to isolate the feeder from the energy source.
c) either A or B is sufficient.
d) 200 A – CORRECT. Rules 4-008(3), 12-106(5), CE Code 2021.

How did YOU do?

3 • Seasoned journeyman
2 • Need refresher training
1 • Apprentice
0 • Just here for fun!


Ray Yousef is a code engineer with Ontario’s Electrical Safety Authority.

This column—along with other great content—appears in the April 2021 edition of Electrical Business Magazine. Even more back issues are located in our Digital Archive.



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