board
box
breaker
builder
cabinet
cable
checking
connecting
construction
electrician
engineer
engineering
equipment
factory
industrial
industry
installation
installing
lamps
maintenance
measure
measurement
multimeter
operator
power
professional
protection
relay
repair
repairman
safety
service
services
supply
switch
switchboard
switchgear
system
systems
technician
technology
terminal
test
testing
tool
voltage
wiring
work
worker
working