background
blue
cable
call
communication
connection
construction
current
danger
distribution
drive
electric
energy
engineering
equipment
generator
gray
grid
high
industrial
infrastructure
iron
light
line
metallic
nature
network
outdoor
phone
pillar
pole
post
power
risk
sky
steel
street
structure
supply
tall
technology
tower
transformer
transmission
urban
utility
volt
voltage
wire