Trent Tarter Posted June 28, 2015 Report Share Posted June 28, 2015 Not sure what theses devises are, possible surge protection?. They're attached to both service masts, home has 2-200 amp panels. They are connected to smaller service mast in center, wish I would have taken some better pictures, any ideas what these are for. Wire insulation looks a little rough. Click to Enlarge 43.83 KB Click to Enlarge 83.07 KB Quote Link to comment Share on other sites More sharing options...
Erby Posted June 28, 2015 Report Share Posted June 28, 2015 Look to be current transformers but it's been awhile since I've had anything to do with those. And then it was for metering equipment for three-phase large amp electrical supplies in large shopping malls. Quote Link to comment Share on other sites More sharing options...
John Kogel Posted June 28, 2015 Report Share Posted June 28, 2015 I think the correct term would be current 'meters', because they measure the current flowing through those conductors. Quote Link to comment Share on other sites More sharing options...
Erby Posted June 28, 2015 Report Share Posted June 28, 2015 Actually John, it's "transformers": "When current in a circuit is too high to apply directly to measuring instruments, a current transformer produces a reduced current accurately proportional to the current in the circuit, which can be conveniently connected to measuring and recording instruments. A current transformer isolates the measuring instruments from what may be very high voltage in the monitored circuit." Though a bit unusual to find in a residential application. Quote Link to comment Share on other sites More sharing options...
Marc Posted June 28, 2015 Report Share Posted June 28, 2015 Erby got it. Don't recall ever seeing one outdoors though. I had a friend years ago who dealt in used industrial power equipment. He had a need to test high amperage devices and was short on funds so I picked out an industrial voltage transformer from his stock, altered the turns ratio, added a small 120 volt variable transformer to the primary and made him a current source that could deliver several hundred amps. It could smoke a 2/0 in seconds. Marc Quote Link to comment Share on other sites More sharing options...
John Kogel Posted June 28, 2015 Report Share Posted June 28, 2015 Thanks, Erby. For the transformation. Marc, I imagine there were some funky smells wafting around your buddy's shop from that smoking insulation. [] Quote Link to comment Share on other sites More sharing options...
Neal Lewis Posted June 28, 2015 Report Share Posted June 28, 2015 This is the typical current transformer I see at mega-houses. Usually in the basement though. Click to Enlarge 70.93 KB Quote Link to comment Share on other sites More sharing options...
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