Electrical Business

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Code Conundrum June 2019


June 17, 2019
By Ray Yousef

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June 17, 2019 – Tackle the Code Conundrum if you dare!

Question 1
For a disconnect switch fused at 400 A and fed with multi-conductor 600-kcmil copper in a raceway, marking is required beside it to state the maximum permitted continuous load.
A) True
B) False

Question 2
The consumer’s service head or equivalent shall be installed in such a position that the point of emergence of the conductors from it is a maximum distance of _____ horizontally from the support for attachment of the overhead service conductors.
A) 150 mm
B) 300 mm
C) 600 mm
D) 750 mm
E) none of the above

Question 3
When feeding building B from building A:
A) The system shall not be grounded at Building B.
B) A bonding conductor is required to be installed from Building A to Building B.
C) A system bonding jumper is required to be installed in the panel of building B.
D) All of the above.
E) A & B.

Answers to this month’s questions will appear in the August 2019 issue of Electrical Business magazine.

In the meantime, here are the answers to the May 2019 Code Conundrum:


Question 1
Each vehicle space in a carport or garage is required to have:
b) One receptacle for each vehicle space, readily accessible. Rule 26-726, CE Code 2018.

Question 2
Rapid shutdown is required for PV systems on or in buildings where the PV source or output conductors are:
d) More than 1 m from the array with shutdown within 30 seconds. Rule 64-218, CE Code 2018.

Question 3
Equipment marked Ex ia Gb is suitable for installation in a Zone 0 location.
b) False. Rule 18-090, Table 18, CE Code 2018

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 (ESA). For more information, visit www.esasafe.com.

This column originally appeared in the June 2019 issue of Electrical Business magazine.


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