alternating
background
blue
cable
call
charge
city
communication
concrete
connection
construction
current
danger
distribution
electric
electrical
electricity
energy
engineer
engineering
environment
foreman
gray
grid
hardhat
helmet
high
industrial
industry
insulator
line
man
network
object
person
phone
pole
post
road
rural
service
sky
structure
supervisor
supply
technology
telephone
tension
tower
transmission
transmit
urban
utility
voltage
white
wire
work
worker