D2 LT4 CEC Section 16 Class I and CLass II Circuits

Question 1

What are the three types of Class 2 circuits?

Answer 1

Remote control, signal, low energy

Question 2

Where can the ampacity of LVT and ELC conductors be found?

Answer 2

Table 57

Question 3

What is a panelboard?

Answer 3

Assembly of buses, connections, overcurrent devices, and control apparatus.

Question 4

Class 2 Circuit Overcurrent Device

Answer 4

Maximum 5 A for 0-20 V

Question 5

What separation distance is required for circuits with voltage over 300V?

Answer 5

600 mm

Question 6

What are overcurrent devices installed to protect?

Answer 6

Branch circuits

Question 7

What is the maximum short-circuit current for the primary battery after 1 minute?

Answer 7

7.5 A

Question 8

Where should panelboards NOT be installed?

Answer 8

Closets, bathrooms, stairwells, high ambient temp rooms

Question 9

What is the maximum voltage allowed for Class 2 equipment as per industry standards?

Answer 9

30 V

Question 10

What circuits should ELC conductors not be used for?

Answer 10

Heating control circuits, fire safety circuits

Question 11

How far should Class 2 circuits be separated from insulated conductors for electric lighting, power, or Class 1 circuits?

Answer 11

50 mm

Question 12

What is unique about Class 2 circuits compared to normal power circuits?

Answer 12

Lower fire and shock hazard

Question 13

When can the 600 mm separation be ignored for circuits with voltage over 300V?

Answer 13

Metal raceways bonded to ground

Question 14

Class 2 Circuit

Answer 14

Overcurrent device required

Question 15

What is the voltage range for a Class 2 transformer?

Answer 15

21-30 V, 31-60 V, 61-150 V

Question 16

What must conductors for use in Class 2 circuits be specified in?

Answer 16

Table 19

Question 17

What are the limitations for ELC conductors?

Answer 17

30 V or less, dwelling units in buildings of combustible structure, dry locations

Question 18

What condition must be met for Class 2 circuits to not require the same precautions as regular power circuits?

Answer 18

Power limited by current output and open-circuit voltage

Question 19

Rule 16-222

Answer 19

Can have fire hazard under severe conditions

Question 20

Class 2 Circuit Overcurrent

Answer 20

May be omitted for 0-20 V from A

Question 21

How high can the circuit voltage be for Class 2 circuits in specialized applications?

Answer 21

120 V

Question 22

What are the two common types of extra-low voltage cable used for Class 2 circuits?

Answer 22

LVT, ELC