art
attention
background
black
cable
caution
current
danger
do not enter
electric
electrical
electricity
energetic
energy
engineering
forbidden
generation
high
illustration
industrial
industry
lightning
line
man
metal
notice
panel
plant
power
precaution
protect
protection
risk
security
sign
silhouette
sky
station
steel
structure
symbol
technology
tower
unauthorized
volt
voltage
warning
white
work
worker