309A Canadian Electrical Code 2

Question 1

What does CEC Rule 4-004 address regarding conductor ampacity?

Accepted Answer

Ampacity tables and correction factors

Answer

Rule 4-004 is the primary rule governing conductor ampacity, directing electricians to the appropriate ampacity tables and requiring the application of temperature and grouping correction factors.

Question 2

According to the CEC, what is the maximum permitted voltage drop from the service entrance to the furthest outlet?

Accepted Answer

5%

Answer

CEC Rule 8-102 recommends a maximum total voltage drop of 5% from the service entrance to the furthest point of utilization, with no more than 3% in the branch circuit or feeder alone.

Question 3

Under the CEC, what minimum clearance is required between a service mast and a window that opens?

Accepted Answer

1000 mm

Answer

The CEC requires a minimum clearance of 1000 mm (1 m) between the service entrance conductors and any window, door, or similar opening that can be opened, to prevent accidental contact.

Question 4

What type of bonding conductor does the CEC require to connect the metal water piping system to the electrical grounding system?

Accepted Answer

No. 6 AWG copper

Answer

CEC Rule 10-406 requires a minimum No. 6 AWG copper bonding conductor to connect the interior metal water piping system to the electrical grounding system to ensure equipotential bonding.

Question 5

According to the CEC, what is the minimum size of copper grounding conductor for a 200 A residential service?

Accepted Answer

No. 2 AWG

Answer

CEC Table 17 specifies a minimum No. 2 AWG copper grounding electrode conductor for services rated up to 200 A, ensuring adequate fault current carrying capacity.

Red Seal Electrician 309A Practice Test

Red Seal Electrician 309A Practice Test

309A Canadian Electrical Code 2