alert
arrow
background
beware
bolt
cable
connection
danger
distribution
electric
electroshock
energy
engineering
factory
hazard
high
industrial
industry
infrastructure
keep
lighting
lightning
line
metal
network
physics
plant
pole
power
prevent
safety
security
shock
sign
station
steel
structure
supply
symbol
technology
transformer
transmission
triangle
triangular
volt
voltage
warning
watt
wire
yellow