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Classic 1980s NEES Set-Up
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Here's my M-250A2 installed on my 6ft cantilever arm. This was THE set-up of the 1980s around here for street lighting. NEES (Narragansett Electric, NECo) installed these arms by the thousands in the 80s, almost all of them with one of these M-250A2 FCOs. Ironically, the arm is actually from Taunton, MA, which has a municipal utility, but they coincidentally used these same arms at some point! I think in Taunton they would have put NEMA heads on these though. When I eventually get my own place, I will be installing this exact set-up in my backyard.
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Any arms smaller than 6ft are also from the incandescent days. Oh, and we have 6ft and 8ft underbraced upsweep arms that were used in the 50s through the mid-60s. By 1965-ish they were using the tapered arms and trusses. Almost all the arms here are aluminum. There were some old rusty steel arms from the incandescent era and in the early 90s they used quite a few 6ft 1-1/4" galvanized steel pipe arms (similar to the style above and also upsweep) but by the late 90s they'd switched back to the aluminum, but using 2" upsweep instead.
I actually have one of those very 6ft 2" upsweep arms made in 2015 by HAPCO! Got it from an electrician friend who got it from his friend at NGrid (the electric company here).