A1 LT14 Flashcards
How does the CEC define low voltage?
Voltages from 31 V to 750 V inclusive
What does NMSC stand for?
Non-metallic sheathed cable
What does MI cable stand for?
Mineral-insulated cable
What is a flexible cord or cable?
Made flexible by incorporating fine wire strands
What is a typical electrical rating for splitters?
400 A, 800 A, 1200 A, 1600 A
What does a bus network provide power to?
Modular motor-starter units
What is classified as extra-low voltage according to the CEC?
Operating at 30 volts or less
What is the outer sheath of NMSC cable made of?
non-metallic (usually plastic)
What is an armoured cable?
Contains metal armour sheath
What are the voltage limits for LWMI and MI cables?
LWMI: up to 300 V, MI: up to 600 V
Where are flexible cords usually used?
Pendant and portable equipment
What does power wiring typically involve?
Distribution of electrical energy within buildings
What voltage is a remote-control wiring system commonly used in lighting circuits?
24 V
What is the voltage limit for NMSC cable?
300 V
Where is armoured cable commonly used?
Open wiring with mechanical abuse
What is Type DRT cable?
Twisted assembly of four coloured insulated conductors
In the CEC, what are low energy control circuits and methods of wiring them often described as?
Class 2 circuits
What is the maximum voltage rating of Type DRT cable?
300 V
What is the construction of TECK 90 cable made of?
PVC covering, insulation, grounding conductor, interlocking armour
What is a heater cord typically used for?
Connection to portable heating equipment
What is the temperature rating of NMSC cable?
90C
What are the three categories of NMSC cables based on installation conditions?
Type NMD90, Type NMW, Type NMWU
What do branch circuits supply?
Lighting, receptacle outlets, heaters, dryers, ranges, motors
What voltage may some motor control circuits operate at?
Up to 600 V
Where is NMSC cable typically used?
buildings of combustible (wood frame) construction
What are aluminum-sheathed cables commonly used for in industrial applications?
Circuits of 600 V to 5000 V
What is the filler in mineral-insulated cables?
Magnesium oxide
What is another name for MI cable?
Pyrotenax
What are the key components of an MI cable?
Copper tube, Magnesium-oxide insulation, Copper rods
What is the size range of the general-service cords?
No. 18 to No. 14 AWG
Give examples of extra-low voltage circuits.
Doorbell or chime circuits, residential thermostat circuits
What types of general-service cords are used for outdoor use?
Type SJOW (300 V) and Type SOW (600 V)
What type of cable is typically used in residential wiring?
Non-metallic sheath (type NMD-90)
What type of cable is typically used for extra-low voltage circuits?
Bell wire, two-conductor, twisted-pair cable in AWG sizes No. 16 and smaller
What is another name for armoured cable?
BX
What sizes do service cords typically range from?
No. 18 to No. 4 AWG
How are communication and signal circuits defined in the CEC?
As extra-low voltage circuits using shielded conductors.
