Phototcell for a series set of streetlights?

I'm guessing a group relay, probably controlling a series regulator.

Yep this is a group relay, but nope its not series! All of Long Beach's street lights run on group relay systems. But look at the way the wiring is set up, can you tell what voltage this is?

It's a 120 volt lighting contactor with a PC for parallel lights with very sloppy wiring!

I've seen worse jobs. My guess is 120 also since there is only one hot, unless there's such thing as a single 240v wire...

Yep you guys are correct it is indeed 120v! If all three wires from the transformer was used, then it'd be 240v, but you can see one of the leads is not used. However, LB has some 240v systems too, I will post a pic of an example within the week.

I see what you did there Dave.

Making Us Guess in "Comments" Instead of putting it in the Description.

You sure are "crazy" with the "quotation" marks.

sure Am.

LOL, I just wanted to know how much you know about electricity

i know it hurts when you contact it,very useful elsewhere LOL

Is that other tap on the transformer just floating there?

Yep that tap is disconnected and not in use, but looks like its tied into place on the bottom of the transformer. BTW, the primary lines here are 12kv.

I wonder why they even bother to connect a wire to that tap? It wouldn't of hurt to just leave the tap bare. Of the could of just used a 120 volt transformer.

Most likely was used as it is a regular stock item. A single 120VAC unit would be a special order item, and having the spare secondary means you can use it if the other winding goes open, without replacing the transformer.

Still I wonder why did they leave the wire attached to the terminal.

Probably just lazyness. Or there was possibly something being fed off the wire at one point.

To make the setup potentially dangerous? XD