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Different electric utility in the California desert!
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Yep, I entered a different electric utility territory while going into the Palm Desert area. Most of Palm Desert has Southern California Edison, but the town Thousand Palms across I-10 has a utility called Imperial Irrigation District which serves most of the southeastern California desert. Here they have some NEMAs mixed in with cobraheads in this mobile home park. They are all HPS though. The arms here are actually made of aluminum.
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Yeah I thought the arms seem to somewhat resemble the newer aluminum upsweep arms in Rhode Island, except in RI they are only in 6' upsweep and 8' undersupport.
The HAPCO style 81 Upsweep is currently installed. RI also has pre-60s Style 82 Underbraced Upsweep HAPCO arms, Style 84 Tapered Elliptical (roughly 1970s-early 2000s), and Style 85 Truss (roughly 1960s-1980s) that were installed over the years. There are also a number of cantilever arms that were probably used from the 1960s through the late 80s until the upsweep took over.