Cable Lug , Types of Lugs

Defination ?
Defination in panel Designing ?
kyu used hota hai ?
Types ?
component ?
features ?
Advantage and disadvantage of panel ?
fuse kya hai ?
lug kya hota hai ?
cable types ?
switch ?
lug types ?
cable duct ?
cable duct types ?
power cable ?
types of power cable ?
types of lug ?
classification of cable ?
bus bar and bus duct ?
circuit breaker ?
Defination of circuit breaker ?
current rating to fuse element ?
cables types and features ?