Please enable JavaScript.
Coggle requires JavaScript to display documents.
Conductor (Electric cable (Types (20kV nominal voltage, 35kV Nominal…
Conductor
Electric cable
The use of proper size
- if the wire used is larger than needed, it needs unnecessary expense
-if the wire used is too small, it could cause excessive voltage drop and damage the equipment
Factors that determine the resistance of a piece of wire
-the diameter of the wire
-the material of the wire
-the length of the wire
-the temperature of the wire
-
Cable constructions
-
-
Armored Cable
Used for mains and sub-mains. The cable is laid below ground level, breaking the surface where it enters sub-stations or transformers and other buildings
Types :
-PILCSTA (paper insulated lead sheathed steel tape armoured)
- PILCSWA (paper insulated lead sheathed steel wire armoured
Electrical wire
Types
HSOS ( house service overhead system cable)
-similar to flexible cords but vulcanized rubber on the outer sheath and PVC insulators on the inner sheath
-has 2 bigger cores and more durable to the environment
MICS (mineral insulated copper sheathed)
-heavy duty and durable
- water, oil, grease and chemical resistance
-can withstand untill 150 C
very expensive and for higher voltages
Flexible PVC (Polyvinyl chloride)
- flexible cord ( for household cosmetic wiring)
-Flexible wires ( for household permanent domestic wiring)
Important criteria the selection of cables :
-cost
-safety
-effectiveness
-durability
-flexibility
-optimum capacity
-handling
- transmit current efficiently
- minimal heart during transmission
-resist fire in a considerable period
-light in weight
Cable construction
Conductor - either solid cores or several strands to one core
Insulator - one or several layers of different materials
Mechanical protection protection (if needed) of solid casing, steel wires or steel tapes