Self Tests 15 & 16

Question 1

Is mineral insulated cable suitable for fire-resistant wiring?

Answer 1

Yes because it is suitable at high temperatures

Question 2

What common characteristics do TW and TWH (TW75) have as insulating materials?

Answer 2

Both are suitable in wet locations

Question 3

Varnished copper wire is used especially in the manufacture of?

Answer 3

coils

Question 4

How do you recognize cross-linked insulation?

Answer 4

Marked XLPE or X link

Question 5

Heat-resistant conductors supplying power to range elements are likely to be insulated with?

Answer 5

asbestos

Question 6

Describe briefly the meaning of the term service conductors?

Answer 6

Main power source for all circuit wiring

Question 7

The CEC classified low voltage as?

Answer 7

31v-750v inclusive

Question 8

List two control-circuit applications that are classified as extra-low voltage?

Answer 8

doorbells or thermostats

Question 9

Communication and signal circuits are generally extra-low voltage and use special ____________ conductors

Answer 9

Shielded

Question 10

In which types of building construction is NMSC almost always used?

Answer 10

wood frame buildings

Question 11

What is the maximum voltage rating for NMSC?

Answer 11

300v

Question 12

In type NMD90, what does the 90 stand for?

Answer 12

90 degrees

Question 13

What is the purpose of bare wire in NMSC?

Answer 13

because it’s the grounding wire

Question 14

In type ACL90, what does the L stand for?

Answer 14

lead sheathing

Question 15

What is TECK 90 cable?

Answer 15

special type of armoured cable

Question 16

what hazard is associated with PVC-jacketed cables?

Answer 16

It is flammable and releases toxic fumes

Question 17

What are the two constructional types of aluminum sheathed cables (ASC)?

Answer 17

Smooth or corrugated seamless aluminum sheath

Question 18

what jacket material is used for corrosion resistant cables?

Answer 18

PVC known as polyvinylchloride

Question 19

Why is MI cable considered a fire-resistant wiring product?

Answer 19

there are no flammable materials

Question 20

What is necessary when terminating MI cable?

Answer 20

a special cable-termination kit

Question 21

What is the main use of NS cable?

Answer 21

for service drops and overhead distributions

Question 22

When using NS cables, what is a messenger?

Answer 22

the bare conductor , wrapped about the insulated conductors as support

Question 23

What is type DRT cable used exclusively for?

Answer 23

range and dryer cables

Question 24

What is a general service cord commonly used for?

Answer 24

hard usage cable for connection to portable equipment

Question 25

Bus bars usually determine the ___________ rating of distribution panels

Answer 25

amperage

Question 26

Bus bars are usually made from which two common materials?

Answer 26

copper and aluminum