Class 1 & Class 2 Circuits #1
Assuming a doorbell circuit is not subjected to mechanical damage, it could be wired with type ELC conductors in a house with metal studs for interior walls. The house is made of wood and is considered to be of combustible construction. True or False?
True
Rule 16-210
What class circuit would a 16 V door chime circuit installed in a dwelling unit be considered if it is supplied by a current limiting transformer of 40 VA.
Class 2
Rule 16-200
True or False. The only difference between Class 1 and Class 2 circuits is the voltage rating.
False
Rule 16-100 and 16-200
11kW
What is the term for a permanently installed heating unit that can be removed or replaced without damaging the building structure?
Heating fixture
Rule 62-102A Class 2 circuit can be fed from a 24 V, 150 VA transformer. True or False.
False
Rule 16-200
What is the maximum fuse rating allowed for the protection of a Class 1 circuit where No. 16 AWG conductors extend beyond the equipment enclosure.
10A
Rule 16-104
When can you use #18 AWG aluminum conductor for Class 1 circuits?
This is not permitted.
Rule 16-110.
What is the term for a permanently installed heating unit that can supply heat to rooms or areas, either through pipes or ducts?
Central Unit
Rule 62-102
What is the term for a rigid or non-rigid laminated plane section in which the heating element is embedded between or in sheets of electrical insulating material?
Heating panel
Rule 62-102
The overcurrent protection requirements of a Class 2 circuit can be met if the current in a 30V circuit is limited to 3.4A. True or false.
False. 30 x 3.4 = 102 which is > 100
Rule 16-212
The overcurrent protection requirements of a Class 2 circuit can be met if the current in a 30V circuit is limited to 3.3A. True or false.
True. 30 x 3.3 = 99 which is less than 100
Rule 16-212
Conductors of Class 1 and Class 2 circuits can be run in the same raceway if they are separated by a barrier. True or False.
True
Rule 16-212 3)
What type of heating generates heat within electrical insulating and semiconductor materials under the action of a high-frequency electric field?
Dielectric heating
Rule 62-102
What type of heating generates heat by means of the application of a low AC voltage across an electrically conductive object with the resulting current directly heating that object?
Impedance heating
Rule 62-102
What is the minimum size of individual copper conductors to be pulled into a raceway for use in a Class 2 circuit?
#16 AWG
Rule 16-210
You can run the circuit for a doorbell in the same conduit as the 120 V circuit for the light at the front door. True or False?
False
Rule 16-212
What VA and voltage ratings must a transformer have in order for the circuit it supplies to be classified as a Class 1 extra-low voltage power circuit?
1000VA, 30V
Rule 16-004
A heating panel set having an input more than _____A shall be supplied by a branch circuit that supplies no other equipment.
30A
Rule 62-114 1)
An ESH has a rated current of 25A. What is the maximum rating of OC device (rated for 100% continuous operation) you can use for the branch circuit conductors of this heater?
35A
Rule 62-114 7b) - 25/0.8 = 31.25
Rule 62-114 8) and Table 13 allows us to use a 35A device
What is the maximum overcurrent protection on the primary side of a 60 V, Class 2 circuit to limit the power to 100 VA?
20A
Rule 16-202 2)
What is the allowable ampacity of a No. 20 AWG, 4-conductor LVT cable?
2.8A
Rule 16-210. Table 57. 3.5 x 0.8 = 2.8
What are the 3 types of Class 1 circuits?
Remote control, extra-low-voltage power and signal
Rule 16-000
What is the demand towards the main service for the ESH in an apartment building that has 30 suites with 3500 W of heating in each suite?
30 x 3.5kW = 105kW
First 10kW @ 100% = 10kW
Remainder @ 75% = 0.75 * 95kW = 71.25kW
10kW + 71.25kW = 81.25kW
What is the demand towards the main service for the electric furnaces in an apartment building that has 30 suites with 3500 W of heating in each suite?
105kW
Rule 62-118 4). Electric furnace loads are taken at 100% demand.