abstract
alert
amps
attention
background
banner
caution
closeup
colour
concept
copper
current
danger
dangerous
design
electric
electrical
electrician
electricity
entry
forbidden
hazard
hazardous
icon
icons
information
insulation
isolated
label
letter
macro
message
mortality
new
no people
nobody
object
office
old
out
risk
safety
security
sign
space
symbol
text
vintage
voltage
voltmetro
warning
weathered
white
wire red
word
written