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100W MV GE M-250A2 FCO
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In North Kingstown, RI. This one is a 1984-1987 model. NECo used a LOT of these in the 80s and sadly removed a lot of them less than 10 years later when the HPS onslaught occurred. The utility pole is pre-1965 too since it's got a brown insulator instead of gray.
The transformer has been replaced though. They went around and replaced most of the transformers around 15-20 years ago. They replaced more old ones around 5 or so years ago after a transformer blew in Johnston, RI and fried appliances in several homes on the small dead-end street. Of course NGrid didn't pay the homeowners anything to replace their TVs, computers, microwaves, refrigerators, toasters, coffee makers, and whatever else was fried by the transformer blowing. I'm glad I wasn't one of those residents. Another reason to dislike LEDs since they're all circuit board powered and would fry too.
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On the other hand, I once heard a funny story (can't validate if it's true) that gypsies were stealing electricity by putting wired horseshoes on power lines. Some electricians from a power company who find out moved one horseshoe from one wire to another, thus changing the voltage from 230 V to 400 V. The effects were similar. They were just watching cursing gypsies because of fried televisions, VCRs etc.
Here's a really old transformer, probably from the 1940s or possibly earlier than that.
AFAIK we don't have any transformers attached to lighting poles here. Our transformers are usually for a group of houses in an area, they're bigger and have their dedicated places. Possibly some solitary houses (near woods etc.) could have transformers like this.
The difference could be in the voltage system. With 230V here the losses are lower hence power lines from the transformer can be longer.
These lines are 240V, with two 120V lines and a neutral. The older street lights like above are actually wired for 240V, but newer ones are 120V. Houses here actually get 240V supplied to them, but it's split at the panel to two 120V circuits, except for clothes dryers and kitchen stoves, which are 240V since they have higher current draw.