this reg powers the city owned HPS lights on nearby huntington dr.

Thanks, I couldn't tell where the wires went although I did see some going underground on the pole before this one. The lights on the street (La France Ave) in front of the house who's backyard I took the other picture from appear to be on a multiple circuit.

They just recently installed some Leotek LED streetlights on the other side of Huntington

BTW, rlshieldjr and Silverliner14b, while leaving the area, I noticed another one in an alley near Olive Ave and Alhambra Rd before the intersection with Atlantic Blvd. Its cleaner than this one (white instead of dark and rusty)

1204 West Alhambra Road if you want to see it

I saw them in the alley off Alhambra on st view. There are 2 regs, the one at the end of the alley has a 12 to 4kV step down trans to feed that one and also the 4kV reg on the next pole. I also saw one on Pine & Atlantic. I have seen a lot of series regs in Alhambra on StView. I have seen the 3 on Shorb in person.

This regulator setup is a cascade switched, whereby another 6.6A series circuit operates the oil switch. You can see the wires going into the front bushing going under the reg and coming up to the 6.6A circuit on the far left, behind the crossarm is a break insulator. This cascade system was very common in SCE land year ago, due to a majority of overhead wired series lights, mostly incandescents.