Wiring Methods - Section 12

Question 1

Which tables are referenced for conduit fill?

Answer 1

• 6A - 6K for only one size of conductor
• 10 A(stranded)/C(solid) then 9A - 9I for different sized conductors in the same pipe.

Question 2

What is the difference between a wireway and a raceway?

Answer 2

Conductors are:

• Pulled into a raceway
• Laid into a wireway.

Question 3

Does the installation of circuits greater than 750 V require special wiring methods, not outlined in section 12?

Answer 3

Yes.

Question 4

How could one reduce the depth requirement for an underground cable or conduit installation?

Answer 4

Protect the wire mechanically.

• Treated plank 38mm thick or poured concrete 50mm thick.
  
  • Wide enough to extend 50mm beyond the installation on either side.

Question 5

Where could one find minimum cover requirements for cable and conduit installed underground?

Answer 5

Table 53

Question 6

Which table is referenced when determining a conductor’s conditions for use?

Answer 6

Table 19.

Question 7

What is the minimum size of conductor allowed to be paralleled?

Answer 7

1/0 awg.

Question 8

When conductors are supported in vertical conduits, which table should be referenced to determine minimum spacing between supports?

Answer 8

Table 21

Question 9

Can a larger size wire be run for longer (unsupported in free air) than a small size wire?

Answer 9

Yes

Question 10

What is the bare conductor in neutral supported cable called?

Answer 10

The messenger.

Question 11

What is the voltage limit for non metallic sheathed cable?

Answer 11

300V

Question 12

What does FT1 marked on a cable mean?

Answer 12

Suitable for use in combustible construction.

Question 13

In kitchens and bathrooms, what consideration must be taken regarding the installation of NMS cable?

Answer 13

Attempt to avoid areas where cabinetry will be installed.

Question 14

When installing teck cable, leaving the inner jacket protruding 5mm from the cable armour is effectively…?

Answer 14

Leaving part of the jacket as an integral anti short.

Question 15

How many different types of raceways are outlined in the CEC?

Answer 15

Fourteen.

Question 16

What two rules should be referenced when obtaining minimum clearance of service conductors?

Answer 16

12-310 and 6-112

Question 17

Is an anti short (or some other form of mechanical protection) always required between conductors and a metal sheath?

Answer 17

Yes.

Question 18

What does the minimum radii of bends in raceways always depend on?

Answer 18

The diameter of the raceway.

Question 19

How many bends can one make in any one run of a raceway?

Answer 19

The equivalent of 4 90 degree bends or 360 degrees.

Question 20

Is it generally acceptable to use a metal raceway as a bonding conductor?

Answer 20

Yes.

Question 21

Which table would one refer to when calculating box fill?

Answer 21

Table 23

Question 22

When calculating box fill, how are wires in the box tallied?

What wires are not counted?

Answer 22

• One wire for any conductor passing straight through.
• One wire for any conductor entering or leaving AND terminated or spliced in the box.
• One wire for any PAIR of wire nuts.
• Two wires for any single strap device.
• Pig tails (for termination).
• Equipment wire from a device.
• Bare bonding conductors.

Question 23

According to the CEC, conductor joints and splices must be…?

Answer 23

Mechanically and electrically secure.