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Old IID arm and kinda old GE fixture
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These S style double guys are old, many date back to the 50s and originally had series incandescent and mercs. The GE split door M-400 here has several bullet holes on the other side. It's a 250w HPS. IID doesn't use 200w HPS unlike PG&E and SCE. They use 250w on main roads, like what I have seen in New England.
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PPL has a LOT of those smaller S shaped arms with bottom braces which looks very decorative in simplest way. They are pretty much in every town and cities under PPL! Also they have those bigger and medium S shaped arms with double guys....then there some of HUGE S shaped arms with V bracket support in middle holding the double guy too.
The newer arms in PPL seems to be the regular curved double guys though but they have some LARGE ones that actually appears to be 25 feet long, but may be 20 feet long!
Here in IID territory all newer arms are also arched or angled, they now use aluminim but steel arch arms are also found.