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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