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Code Conundrum May 2021

June 10, 2021 | By Ray Yousef

Tackle the Code Conundrum... if you dare!

June 10, 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 April 2021’s questions (below). Answers to these new questions in our June 2021 edition (and here at EBMag.com).


A Class 2 power supply unit may be installed in a wet location:

a) with no restrictions
b) only when marked as such
c) only when equipped with GFCI protection
d) None of the above. Not permitted in wet locations.



Grounding conductors for electrical services are:

a) required to be electrically continuous
b) required to be mechanically continuous
c) allowed to be joined using approved components
d) A and B
e) A and C


The point of attachment of overhead supply service conductors shall be:

a) on the same side of the building as the consumer’s service head or equivalent
b) solidly anchored to the structure or service mast
c) in a position that allows the overhead service conductors or cables to angle away from the structure
d) in compliance with the requirements of the supply authority
e) all of the above

ANSWERS from our April 2021 edition.


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

a) True
b) False – CORRECT – Rule 18-090 and Table 18, CE Code 2021.


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

a) 1 A
b) 0.8 A. – CORRECT – Rule 16-330 and Table 60, CE Code 2021.
c) 0.5 A
d) None of the above


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. – CORRECT – Rule 10-400, CE Code 2021.
d) None of the above. Grounding is required for all alternating current systems.

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 May 2021 edition of Electrical Business Magazine. Even more back issues are located in our Digital Archive.

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