Electrical Business

Code conundrum March 2017 • Ray Yousef

March 14, 2017
March 14, 2017
By Ray Yousef


March 14, 2017 – Time to brush up on those CE Code skills!

Does the CE Code permit a bare neutral in a consumer service (when the conductor is made of copper and run in a raceway)?

a) Yes
b) No

Overload protection shall not be required for a manually started motor rated at ___ hp or less when: it is continuously attended while in operation, and is on a branch circuit having overcurrent protection rated at (or not set at more than) 15A; or on an individual branch circuit having overcurrent protection (as required by Table 29) when it can be readily determined from the starting location the motor is running.


a) 1/2 hp
b) 1 hp
c) 2 hp
d) 5 hp

Plug fuses and fuse holders shall not be used in a 240V single-phase, 3-wire grounded system.

a) True
b) False

Answers to these questions next month. Meantime, here are the answers to the February 2016 Code Conundrum:

Question 1
The maximum ampacity for #6 AWG T90 nylon run in a conduit containing 6 #6AWG T90 nylon, 12 #14AWG TWU75 and 7 #12AWG TW75 is:

d) 33A. Rule 4-004(15) and (14).

Question 2
Electrical equipment suitable for non-hazardous locations may be installed in a ventilated Zone 2 area when it is continuously monitored by a combustible gas detection system that automatically de-energizes the equipment when gas concentration reaches ___ of the lower explosive limit.

d) 40%. Rule 18-068..

Question 3
Pendant lampholders in Category 1 locations must be weatherproof, unlike Category 2, where corrosive liquids exist.

b) False. Rule 22-104..


• 3/3 = Master Electrician
• 2/3 = Journeyman
• 1/3 = Apprentice
• 0/3 = Plumber?!?

The Code Conundrum is compiled by Ray Yousef of Ontario’s Electrical Safety Authority.

N.B. Always consult your AHJ for more specific interpretations

* This article also appears in the March 2017 edition of Electrical Business Magazine. Check out our ARCHIVE page for back issues.

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