April 30, 2024 – Welcome to the newest round of questions that test your knowledge of the CE Code-Part I. Answers will appear in the June 2024 edition of Electrical Business Magazine, and online at EBMag.com.

QUESTION 1 – What size of copper tap conductor is required to connect a metal fence around an outdoor substation to the station ground electrode?

a) 6 AWG
b) 2/0 AWG
c) 3/0 AWG
d) 4/0 AWG

QUESTION 2 – Receptacles having CSA configurations 5-15R or 5-20R installed in buildings under construction:

a) Shall be protected by GFCI Class A
b) Can be wired by NMSC
c) Shall be kept entirely separate from lighting branch circuits
d) All of the above

QUESTION 3 – Class H fuses are permitted to be used for overcurrent protection where circuit overload protection is provided by other means.

a) True
b) False

ANSWERS to Code Conundrum, February 2024 edition.

QUESTION 1 – What is the maximum allowable ampacity for a #6AWG T90 Nylon run in conduit containing 6 #6AWG T90 Nylon, 12 #14AWG TWU75 and 7 #12AWG TW75?

a) 65 A
b) 55 A
c) 39 A
d) 33 A. Rule 4-004(13)(14).

QUESTION 2 – Areas where paint finishes are regularly applied by spraying and there is adequate ventilation, the interior of spray booths—and their exhaust ducts—are considered:

a) Zone 0
b) Zone 1. Rule 20-302(1).
c) Zone 2
d) Zone 20

QUESTION 3 – When receptacles in a trailer park are mounted vertically, the CE Code requires the U-ground slot to be:

a) At the top. Rule 72-110(3).
b) At the bottom

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.

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