Electrical Service in El Montevideo
El Montevideo is a registered Tucson neighborhood in Ward 6. Of the homes here with a published build year, the median went up in 1967 — and in electrical terms, the year a house was built tells you most of what you need to know about what is behind its walls.
When El Montevideo was built
Highlighted bands are the eras that carry a known electrical issue — pre-1950 knob-and-tube, the 1965–1973 aluminum branch-circuit window, and the 1974–1989 Federal Pacific / Zinsco panel years. Source: City of Tucson and Pima County assessor records, read parcel by parcel inside the neighborhood boundary.
Knob-and-tube and ungrounded circuits
About 21% of the homes here predate 1950. In original, un-remodeled areas that can still mean knob-and-tube wiring — no ground, not rated for modern loads, and not safe in contact with blown-in insulation. It is also why so many houses in this part of town still have two-prong outlets, or three-prong outlets with nothing behind the ground pin. Both are fixable, and neither is an emergency on its own.
Post-war services and ungrounded circuits
About 27% of the homes here went up between 1950 and 1964 — Tucson's post-war boom. Services from those years were 60 to 100 amps, often originally a fuse panel that has since been swapped for breakers without the service itself ever being enlarged. Grounded branch circuits did not become the norm until the early 1960s, so much of the original wiring in these houses is two-wire with no equipment ground, and the cloth jacket on that era's NM cable embrittles in a Tucson attic.
Federal Pacific and Zinsco panels
About 38% of the housing stock here dates to 1974–1989, when Federal Pacific Stab-Lok and Zinsco/Sylvania panels were still being installed. Both have documented failure-to-trip histories, and the failure is in the breaker-to-bus connection itself — so fitting a new breaker does not resolve it, which is why the panel is what gets replaced once you need to add a circuit.
Neighborhood boundaries
- NorthEast 5th Street
- EastAlvernon Way
- SouthBroadway Boulevard
- WestDodge Boulevard
Check your actual address
Neighborhood averages are a starting point, not an answer. Our free Property Electrical Profile reads the county record for one specific parcel — the build year, the assessor’s use and zoning, and the permit history — and tells you what that suggests about the service, the wiring era, and the panel.
What we do in El Montevideo
We are a licensed Arizona electrical contractor working across Tucson and Pima County. In neighborhoods like this one that usually means panel and service upgrades, replacing obsolete or unsafe panels, correcting aluminum branch-circuit terminations, adding grounded and GFCI-protected circuits, and sizing a service that can carry EV charging or a heat pump. If you want the load math first, the free load calculator runs NEC 220.82.
Other Tucson neighborhoods
Talk to an electrician who knows this housing stock
Tell us the address and what you are planning. We will tell you what we would expect to find and what it takes to get there.