Electrical Business

Code Conundrum February 2021

Tackle the Code Conundrum... if you dare!

February 26, 2021
By Ray Yousef


February 26, 2021 – Welcome to the newest round of Code Conundrum questions, plus answers to December 2020’s questions (below)! Answers to these new questions in our April 2021 edition.


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



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


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) 60 A
b) 100 A
c) 150 A
d) 200 A

ANSWERS from our December 2020 ed.

Question 1

For the demand load calculation for a school, the total demand load for 12 electric vehicle chargers—where each is rated at 8 kW—without an Electric Vehicle Energy Management System is:

a) 96 kW
b) 86.4 kW
c) 76.8 kW – CORRECT: Rule 8-204 and Table 38.
d) 67.2 kW

Question 2

All space within 6 m horizontally in any direction from dip tanks and their drain boards, with the space extending to a height of 1 m above the dip tanks and drain boards, is considered Zone 2.

a) True
b) False – CORRECT: Rule 20-302(1)(c).

Question 3

When interconnecting a solar PV system with the utility feeder, a means of isolation shall be provided:

a) to isolate utility feeders.
b) to isolate the feeder from the energy source.
c) either A or B is sufficient.
d) to isolate all sources of supply – CORRECT: Rule 84-026.

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

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