network electric cable with metal flex pipe attached to concrete electric poles.

iron lighting wall wood machine furniture room glass door window floor light column metal wheel ceiling network electric cable flex pipe attached concrete poles installation electrical wiring system screws nuts mounting safety concept good manage background box building cable ceiling center channels conduit connect construction control design distribution electric electrical electricity energy engineering equipment factory home industrial industry installation installed ladder line maintenance metal panel pipe pipeline power power lines repair safety service station steel structure system technology tube voltage white wire wires wiring work