blue
cable
call
charge
city
communication
company
conductor
connection
copy
current
danger
distribution
drum
electric
electrical
electricity
energy
engineering
environment
gray
grid
high
industrial
industry
insulator
line
network
object
phone
pole
post
power
road
rural
service
sky
space
structure
supply
technology
telephone
tension
transformer
transmission
urban
utility
voltage
white
wireless