alert
arrow
attention
background
beware
black
cable
caution
current
danger
dangerous
death
electric
electrical
electricity
energy
fence
forbidden
hazard
high
high voltage
icon
industrial
industry
information
lightning
line
metal
notice
power
protection
risk
safety
security
shock
sign
signal
station
substation
supply
symbol
technology
transformer
triangle
volt
voltage
warning
warning sign
wire
yellow