Code conundrum March 2017 • Ray Yousef
March 14, 2017 - Time to brush up on those CE Code skills!
Does the CE Code permit a bare neutral in a consumer service (when the conductor is made of copper and run in a raceway)?
Overload protection shall not be required for a manually started motor rated at ___ hp or less when: it is continuously attended while in operation, and is on a branch circuit having overcurrent protection rated at (or not set at more than) 15A; or on an individual branch circuit having overcurrent protection (as required by Table 29) when it can be readily determined from the starting location the motor is running.
a) 1/2 hp
b) 1 hp
c) 2 hp
d) 5 hp
Plug fuses and fuse holders shall not be used in a 240V single-phase, 3-wire grounded system.
Answers to these questions next month. Meantime, here are the answers to the February 2016 Code Conundrum:
The maximum ampacity for #6 AWG T90 nylon run in a conduit containing 6 #6AWG T90 nylon, 12 #14AWG TWU75 and 7 #12AWG TW75 is:
d) 33A. Rule 4-004(15) and (14).
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.
d) 40%. Rule 18-068..
Pendant lampholders in Category 1 locations must be weatherproof, unlike Category 2, where corrosive liquids exist.
b) False. Rule 22-104..
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 March 2017 edition of Electrical Business Magazine. Check out our ARCHIVE page for back issues.
EPEC 2017: IEEE Canada Electrical Power & Energy Conference
October 22-25, 2017
Electrical Safety in Construction Workshop
October 25-26, 2017