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Code Conundrum June 2017 • Ray Yousef

June 26, 2017 | By Ray Yousef

June 26, 2017 – Tackle June’s Code Conundrum… if you dare!

Question 1
Which of the wiring methods listed below is not allowed in a Zone 1 area?

a) Armoured cable with approved glands.
b) RWU90 cable with approved glands.
c) Threaded rigid metal conduit with approved glands.
d) Liquid-tight flexible conduit with approved glands.

Question 2
At least one duplex receptacle must be in a residential porch.


a) True
b) False

Question 3
A wall switch located at the head of the stairs shall control all the luminaires located in an unfinished basement.

a) True
b) False

ANSWERS to these questions next month. MEANTIME, here are the answers to the May 2017 Code Conundrum!

Question 1
For hotels, the minimum ampacity for service or feeder conductors shall be based on a basic load of ___ W/m2, plus other lighting loads for special areas, as well as heating and A/C loads.

b) 20. Rule 8-208(1).

Question 2
In adequately ventilated areas where paint finishes are regularly sprayed, the interiors of spray booths and their exhaust ducts are considered:

a) Class I, Zone 1. Rule 20-302(1).

Question 3
In basic care areas, and areas routinely cleaned with liquids that splash against the walls, receptacles shall be installed not less than ___ mm above the floor.

b) 300 mm. Rule 24-106(2).


• 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 June 2017 edition of Electrical Business Magazine. Check out our ARCHIVE page for back issues.

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