ac
arm
assembly
background
cable
close
close up
closeup
connecting
connection
connector
contact
cost
current
earth
electrical
electricity
glove
hand
hold
install
installation
isolated
job
male
man
person
pin
power
process
protected
protection
renovation
safe
screwdriver
screwing
socket
standard
symbol
symbolic
technology
test
tester
up
user
wall
white
wire
work
worker