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Code Conundrum December 2020

Tackle the Code Conundrum... if you dare!


December 7, 2020
By Ray Yousef

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December 7, 2020 – Welcome to the newest round of Code Conundrum questions, plus answers to October’s questions (below)! Answers to these new questions in our February 2021 edition.

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
d) 67.2 kW

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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

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.


ANSWERS from our October 2020 edition

Question 1

Which of the following is an acceptable location for the installation of HDPE conduit?

a) Underground, encased in concrete
b) Underground, direct-buried
c) Above-ground when encased in concrete
d) All of the above – CORRECT – Rules 12-1250, 12-1252.
e) B and C

Question 2

A 75-kVA transformer hanged from a ceiling structure in an office building is required to have a minimum 1 m of working space:

a) only on the sides to provide access to conductor connections – CORRECT – Rule 2-312.
b) on all sides
c) with secure footing
d) A and C
e) none of the above, working space only applies to floor-mounted transformers

Question 3

Where the DC arc fault protection is not located at the photovoltaic module, mechanical protection is required for PV source circuit conductors installed on or above buildings to protect against rodent damage.

a) True – CORRECT – Rule 64-210(5).
b) False

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, esasafe.com.

This column—along with other great content—appears in the December 2020 edition of Electrical Business Magazine.



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