Code conundrum February 2017 • Ray Yousef
February 14, 2017 - More on ampacity, combustible gas detection and pendant lampholders below!
The maximum ampacity for #6AWG T90 nylon run in a conduit containing 6 #6AWG T90 nylon, 12 #14AWG TWU75 and 7 #12AWG TW75 is:
Electrical equipment suitable for non-hazardous locations may be installed in a ventilated Zone 2 area when it is continuously monitored by a combustible gas detection system that automatically de-energizes the equipment when gas concentration reaches ___ of the lower explosive limit.
Pendant lampholders in Category 1 locations must be weatherproof, unlike Category 2, where corrosive liquids exist.
Answers to these questions next month. Meantime, here are the answers to the January 2016 Code Conundrum:
Where non-metallic sheathed cable is exposed, switch, outlet and tap devices of insulating material can be used without boxes.
a) True. Rule 12-522(1).
The minimum headroom around an elevator’s controller and disconnecting means shall be:
b) 2 m. Rule 38-005.
Class 1 circuit conductors of #16AWG copper do not extend beyond the equipment enclosure and do not require overcurrent protection.
a) True. Rule 16-104(1).
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 February 2017 edition of Electrical Business Magazine. Check out our ARCHIVE page for back issues.
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October 22-25, 2017
Electrical Safety in Construction Workshop
October 25-26, 2017