D2 LT4 CEC Section 16 Class I and CLass II Circuits Flashcards
What are the three types of Class 2 circuits?
Remote control, signal, low energy
Where can the ampacity of LVT and ELC conductors be found?
Table 57
What is a panelboard?
Assembly of buses, connections, overcurrent devices, and control apparatus.
Class 2 Circuit Overcurrent Device
Maximum 5 A for 0-20 V
What separation distance is required for circuits with voltage over 300V?
600 mm
What are overcurrent devices installed to protect?
Branch circuits
What is the maximum short-circuit current for the primary battery after 1 minute?
7.5 A
Where should panelboards NOT be installed?
Closets, bathrooms, stairwells, high ambient temp rooms
What is the maximum voltage allowed for Class 2 equipment as per industry standards?
30 V
What circuits should ELC conductors not be used for?
Heating control circuits, fire safety circuits
How far should Class 2 circuits be separated from insulated conductors for electric lighting, power, or Class 1 circuits?
50 mm
What is unique about Class 2 circuits compared to normal power circuits?
Lower fire and shock hazard
When can the 600 mm separation be ignored for circuits with voltage over 300V?
Metal raceways bonded to ground
Class 2 Circuit
Overcurrent device required
What is the voltage range for a Class 2 transformer?
21-30 V, 31-60 V, 61-150 V
What must conductors for use in Class 2 circuits be specified in?
Table 19
What are the limitations for ELC conductors?
30 V or less, dwelling units in buildings of combustible structure, dry locations
What condition must be met for Class 2 circuits to not require the same precautions as regular power circuits?
Power limited by current output and open-circuit voltage
Rule 16-222
Can have fire hazard under severe conditions
Class 2 Circuit Overcurrent
May be omitted for 0-20 V from A
How high can the circuit voltage be for Class 2 circuits in specialized applications?
120 V
What are the two common types of extra-low voltage cable used for Class 2 circuits?
LVT, ELC
