Wiring Methods - Section 12 Flashcards
Which tables are referenced for conduit fill?
- 6A - 6K for only one size of conductor
- 10 A(stranded)/C(solid) then 9A - 9I for different sized conductors in the same pipe.
What is the difference between a wireway and a raceway?
Conductors are:
- Pulled into a raceway
- Laid into a wireway.
Does the installation of circuits greater than 750 V require special wiring methods, not outlined in section 12?
Yes.
How could one reduce the depth requirement for an underground cable or conduit installation?
Protect the wire mechanically.
- Treated plank 38mm thick or poured concrete 50mm thick.
- Wide enough to extend 50mm beyond the installation on either side.
Where could one find minimum cover requirements for cable and conduit installed underground?
Table 53
Which table is referenced when determining a conductor’s conditions for use?
Table 19.
What is the minimum size of conductor allowed to be paralleled?
1/0 awg.
When conductors are supported in vertical conduits, which table should be referenced to determine minimum spacing between supports?
Table 21
Can a larger size wire be run for longer (unsupported in free air) than a small size wire?
Yes
What is the bare conductor in neutral supported cable called?
The messenger.
What is the voltage limit for non metallic sheathed cable?
300V
What does FT1 marked on a cable mean?
Suitable for use in combustible construction.
In kitchens and bathrooms, what consideration must be taken regarding the installation of NMS cable?
Attempt to avoid areas where cabinetry will be installed.
When installing teck cable, leaving the inner jacket protruding 5mm from the cable armour is effectively…?
Leaving part of the jacket as an integral anti short.
How many different types of raceways are outlined in the CEC?
Fourteen.
What two rules should be referenced when obtaining minimum clearance of service conductors?
12-310 and 6-112
Is an anti short (or some other form of mechanical protection) always required between conductors and a metal sheath?
Yes.
What does the minimum radii of bends in raceways always depend on?
The diameter of the raceway.
How many bends can one make in any one run of a raceway?
The equivalent of 4 90 degree bends or 360 degrees.
Is it generally acceptable to use a metal raceway as a bonding conductor?
Yes.
Which table would one refer to when calculating box fill?
Table 23
When calculating box fill, how are wires in the box tallied?
What wires are not counted?
- 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.
According to the CEC, conductor joints and splices must be…?
Mechanically and electrically secure.
