December 12, 2016 – Our monthly Code Conundrum has questions to keep you guessing!

QUESTION 1
In a dwelling unit, what is the maximum mounting height to a panelboard’s overcurrent device handle (from floor level)?

a) 1.5m 
b) 1.6m
c) 1.7m   
d) 1.8m

QUESTION 2
What size of tap conductor is required to connect a metal fence around an outdoor substation to the station ground electrode?
    
a) #6 AWG   
b) 2/0 AWG
c) 3/0 AWG
d) 4/0 AWG

QUESTION 3
When Type CFC system wiring is used, it shall be covered with abrasion-resistant tape and secured to the floor so that all cables, corners and bare conductor ends are completely covered.

a) True
b) False

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

Question 1
When a service switch is marked for continuous operation at 100% and is supplied by multi-conductor cable, what is the maximum continuous load permitted?

b) 100%. Rule 8-104(5).

Question 2
What is the minimum size copper bonding conductor that can be secured to the surface on which it is carried (with mechanical protection)?

d) 6 AWG. Rule 10-808(5).

Question 3
A 5-15R receptacle mounted outdoors at 750mm above finished grade requires a cover plate:

a) A and B. Rule 26-702(2).

HOW DID YOU DO?

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