309A Wiring Methods and Materials 2

Question 1

What is the primary advantage of using MC (metal-clad) cable over NMD90 in commercial applications?

Accepted Answer

Mechanical protection from the metal armour

Answer

Lower cost per metre

Answer

Higher ampacity ratings

Answer

Easier to install in residential settings

Question 2

What is the CEC requirement for supporting NMD90 cable within a distance of an electrical box?

Accepted Answer

Within 300 mm

Answer

Within 150 mm

Answer

Within 450 mm

Answer

Within 600 mm

Question 3

What type of raceway is most suitable for a corrosive chemical processing environment?

Accepted Answer

PVC conduit (Schedule 40)

Answer

EMT (Electrical Metallic Tubing)

Answer

Rigid metal conduit (galvanized)

Answer

Flexible metal conduit

Question 4

What is the maximum percentage fill for a wireway (auxiliary gutter) according to the CEC?

Accepted Answer

75%

Answer

20%

Answer

40%

Answer

50%

Question 5

When is it acceptable to use flexible metal conduit (FMC) as the sole equipment grounding conductor?

Accepted Answer

When the conduit is 25 mm trade size or smaller and the circuit is 20 A or less

Answer

In all applications up to 60 A

Answer

Only in dry locations regardless of size

Answer

It is never acceptable as a grounding conductor

Question 6

What colour identification is required for a high-leg (wild leg) conductor in a 4-wire delta system?

Accepted Answer

Orange

Answer

Red

Answer

Blue

Answer

Yellow