Electrical Business

Features Code Conundrum Codes & Standards
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.

learning curve Sponsored Content
Post your tech sheets, white papers, new technology etc. Contact Anthony Capkun