Electrical Business

Code Conundrum October 2016 • Ray Yousef

October 11, 2016
October 11, 2016
By Ray Yousef


October 11, 2016 – Our monthly code conundrum is a fun way to see how your code knowledge is doing!

Class H fuses can be used for overcurrent protection in places where circuit overload protection is provided by other means.

a) True    
b) False

The maximum voltage for a Class 2 circuit is:
a) 30V   
b) 48V
c) 115V    
d) 150V


The space within 6m (horizontally in any direction) from dip tanks and their drain boards, and extending to a height of 1m above the tank, is considered:

a) Class I, zone 1
b) Class I, zone 2
c) Class II, Division 1
d) Class II, Division 2

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

Question 1
The metal assembly of a raised floor in a computer room must be bonded with a  copper conductor to form an effective equipotential plan.

d) #6AWG. Rule 10-406(7).

Question 2
The CE Code allows two supply services of the same voltage (from the same system of any supply authority) to enter a building, if one will only be used for supplying a fire pump.

a) True. Rule 6-102(1).

Question 3
If a service switch is marked for continuous operation at 100%—and is supplied by single conductor cable in free air—what is the maximum continuous load?

c) 85%. Rule 8-104(5).


• 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 October 2016 edition of Electrical Business Magazine. Check out our ARCHIVE page for back issues.

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