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Code Conundrum September 2016 • Ray Yousef

September 12, 2016 | By Ray Yousef

September 12, 2016 – How well do you know the CE Code? Try our Code Conundrum!

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

a) #12AWG    
c) #8AWG
b) #10AWG    
d) #6AWG

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    
b) False

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 load?

a) 100%    
c) 85%
b) 80%  
d) 70%

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

Question 1
While it is permitted to use electrical non-metallic tubing (ENT) underground and in concealed locations, it is not permitted in exposed locations.
b) False. Rule 12-1500.

Question 2
When installing receptacles for dwelling units, the CE Code requires that no point along the floor line of any usable wall space is more than  metres horizontally from a receptacle in that or an adjoining space.
c) 1.8 m. Rule 26-712(a).

Question 3
For a mobile home, the minimum length of #6AWG power supply cord measured from the attachment plug to the point of entrance to the unit is:
d) 7.5 m. Rule 70-108(1)(e).


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

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