Electrical Business

Uncategorized Code Conundrum
Code Conundrum April 2020

May 8, 2020  By Ray Yousef

Tackle the code conundrum if you dare!

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


When only 4 conductors of an 8-conductor cable (not marked LP) are used for power, the ampacities obtained from Table 60 must be multiplied by:


a) 0.5
b) 1
c) 1.4
d) 2
e) None of the above


The ampacity of an approved cable bus assembly is determined from:

a) A Section 4 ampacity calculation
b) The ampacity on the product label
c) A certified test report from the cable bus manufacturer
d) A and C
e) A and B


A bonding connection is required for any device having a bonding terminal and mounted on a non-metallic outlet box.

a) True
b) False


ANSWERS from February 2020 edition.

Question 1

A totally enclosed, non-ventilated Class B motor requires conductors rated at 38A. The minimum size of copper multi-conductor cable that can be used is:

b) No. 8 AWG TECK90. Ref. 28-104, Table 37 & Table 2.

Question 2

A disconnect for luminaires with double-ended lamps operating at 120V is required for:

e) None of the above. Ref. 30-308

Question 3

For a single dwelling unit with 100A breaker using No. 3 AWG copper service conductors, is the required marking based on Rule 4-004 22) and Table 39?

b) No. Ref. Rule 4-004 22) and Table 39.


About the author…

Ray Yousef is a code engineer with Ontario’s Electrical Safety Authority.

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

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