309A Canadian Electrical Code 1 — Questions and Answers
Question 1: According to the Canadian Electrical Code (CEC), what is the minimum height for receptacle outlets in a dwelling unit above the finished floor?
- 150 mm (Correct answer)
- 300 mm
- 450 mm
- 600 mm
Correct answer: 150 mm
The CEC specifies a minimum mounting height of 150 mm for receptacle outlets above the finished floor in dwelling units to ensure accessibility and safety.
Question 2: What section of the Canadian Electrical Code covers wiring methods for hazardous locations?
- Section 12
- Section 18 (Correct answer)
- Section 22
- Section 26
Correct answer: Section 18
Section 18 of the CEC deals specifically with hazardous locations, covering installation requirements for areas where flammable gases, vapours, or combustible dusts may be present.
Question 3: Under the CEC, what is the maximum number of conductors permitted in a single raceway before derating factors must be applied?
- 1 to 3 conductors (Correct answer)
- 1 to 4 conductors
- 1 to 6 conductors
- 1 to 9 conductors
Correct answer: 1 to 3 conductors
When more than 3 current-carrying conductors are installed in a single raceway, ampacity derating factors from Table 5C must be applied to account for mutual heating effects.
Question 4: According to CEC Rule 26-710, what type of receptacle is required in a bathroom within 1 m of a sink?
- Standard duplex receptacle
- Split receptacle on separate circuits
- Ground fault circuit interrupter (GFCI) protected receptacle (Correct answer)
- Tamper-resistant receptacle only
Correct answer: Ground fault circuit interrupter (GFCI) protected receptacle
CEC Rule 26-710 mandates GFCI protection for receptacles installed within 1.5 m of sinks and in bathrooms to protect against electric shock in wet locations.
Question 5: What is the minimum burial depth for direct-buried RW90 cable under a driveway according to the CEC?
- 450 mm
- 600 mm (Correct answer)
- 750 mm
- 900 mm
Correct answer: 600 mm
The CEC requires a minimum burial depth of 600 mm for direct-buried cables under driveways to protect them from damage caused by vehicle traffic.
Question 6: According to the CEC, what is the maximum voltage permitted for a Class 2 circuit?
- 24 V
- 30 V
- 42.4 V (Correct answer)
- 150 V
Correct answer: 42.4 V
The CEC defines Class 2 circuits as having a maximum voltage of 42.4 V peak or 60 V DC, with limited power output, making them inherently safe from fire and shock hazards.
309A Canadian Electrical Code 1
According to the Canadian Electrical Code (CEC), what is the minimum height for receptacle outlets in a dwelling unit above the finished floor?