background
blue
builder
building
cable
connection
construction
contractor
danger
electric
electrical
electrician
electricity
energy
engineer
engineering
equipment
foreman
helmet
hero
high
industrial
industry
job
line
maintenance
male
man
occupation
people
person
pole
post
power
professional
protection
protective
rescue
safety
service
sky
technology
telephone
tower
uniform
voltage
wire
work
worker
yellow