Wiring rarely fails all at once — it usually ages gradually, and homeowners often notice a problem only once there's a burning smell or the breaker starts tripping regularly. Knowing roughly how long your wiring is meant to last is useful precisely so you don't end up in an emergency situation.
Here's how long aluminum and copper wiring typically last, the visible and indirect signs of aging, and when replacement genuinely shouldn't be postponed.
Aluminum wiring: how long it lasts
Aluminum wiring was widely installed in buildings up through roughly the 1990s. The nominal service life of that cable is around 20-25 years, but in practice aluminum tends to oxidize at connection points and becomes brittle after repeated bending. Even if a wire looks intact on the outside, connections inside junction boxes loosen over time, contact quality drops, and that's exactly where overheating shows up most often.
Copper wiring: how long it lasts
Copper cable lasts longer — manufacturers typically claim 25-30 years or more under proper operating conditions. Copper oxidizes less, holds contact in terminals better, and handles bending more reliably. But copper wiring isn't permanent either: cable insulation ages with time, temperature swings, and sustained load, especially if the wire was originally sized for a smaller set of appliances than what's actually running on it now.
What accelerates wiring wear
- Chronic circuit overload — for example, a socket that was never sized for the current lineup of appliances.
- Persistent moisture where the cable runs (kitchens, bathrooms without proper protection).
- Poor-quality connections in junction boxes — twisted joints without soldering or terminal blocks.
- Mixing aluminum and copper conductors in one connection without proper transition terminals.
- Mechanical damage to insulation during renovations — hidden screw punctures, chafing at bend points.
Signs it's time to replace the wiring
There are several signals worth taking seriously even if wiring is technically 'still working': warm or hot outlets and switches, discoloration or warping of an outlet's plastic housing, a burning smell with no visible source, a breaker tripping frequently without an obvious overload, lights flickering when a high-power appliance turns on. Any single sign might be minor on its own, but combined with the building's age, they're a solid reason for a diagnostic check.
Does the whole wiring system need replacing at once
Not always. If the building is old but the problem is localized — say, one kitchen outlet runs hot — sometimes replacing just that section of cable or redoing a specific connection is enough. Full rewiring is usually justified during a major renovation, when moving into an apartment with aluminum wiring 25-30 years old or more, or when a diagnostic reveals multiple issues across the whole panel rather than one spot. Either way, the decision should follow an actual inspection, not a guess.
When to call an electrician
If you don't know whether your apartment's wiring is aluminum or copper, or how old it is, it makes more sense to start with a diagnostic than to buy materials 'just in case.' An electrician will assess the condition of the circuits, check for heat in the panel and outlets, and tell you whether partial or full replacement is warranted. ELECTRIC ASTANA carries out this kind of diagnostic and wiring installation/replacement 24/7, around the clock; wiring installation starts from 600 KZT per meter, with the exact cost depending on scope and complexity.