I saw pieces of plywood hung on the walls with 5 porcelain keyless sockets with at
These are common around construction sites in the NYCTA subway system also.
However, the NYCTA's "work lights" consist of a cast plastic resin batten with five yellow rubber lampholders screwed on and connected in series by a cable running through a smal trough in the middle of the batten.
The hook-up wires are thick yellow cables terminated in huge alligator-clip style clamps. It's difficult to tell what gauge the wires are because the insulation is really thick.
One of these cables is connected to the "third rail" and the other is connected to ground (one of the normal rails). Two hooks on the back of the batten are used for wrapping the cables after use and also for hanging the entire lamp assembly from a pipe.
Each lampholder is rated for 600 volts, 660 watts!! It's stamped right there on the rubber insulation.
The workmen usually plug in five 75 or 100 watt bulbs in series which gives ample amounts of light in a soot-encrusted tunnel. All bulbs must be of the same wattage.
They are obviously manufactured. They don't look like your regular home-brew stuff...unless the TA actually manufactures these things in a shop for their own use. But they're very well crafted.
Wonder how much one of them would cost....
My only problem is that I think each bulb should have a protective plstic cage to prevent the bulb from getting accidentally banged and shattered and exposing a person to live electricity across the exposed wires.