I can't tell you about underground but as to above ground we have Two 3 phase lines coming down our street. The upper is 25 KV and the lower is 13.3 KV with the 13.3 KV feeding the residential transformers. We had a run last year of squirrels getting across the 13.3 KV where it entered one transformer. I have no clue what made them suicidal at that transformer? Always the same one and once a week for a month. The fuse has a disconnect and the disconnect uses an explosive charge to make sure it opens. When that sucker would pop it was like standing forward of a 12 gauge shotgun. That was exactly what it went off like, a 12 gauge shotgun 3" high brass load! Scare the hell out of you. That transformer fed right up to our neighbors beside and across the street, we were or are on the next transformer up the road.POW!
2 PM
Apparently a circuit breaker popped on a power pole.
I logged out without clicking my mouse.
First of many this summer?
Only down for an hour...not bad.
My computer has a UPS, but not the router.
I wonder what it sounds like if a circuit breaker that size pops where all the utility wires are buried.
Do they even use that kind of circuit breaker for underground utilities?
Ron

