Al Nahda tower flat — breakers trip and lights dim when everything's on: is it my flat or the building?

The good news is this is almost always flat-side and fixable, not the building running out of supply. A breaker that trips only when several big loads run together is doing its job, protecting an overloaded circuit; and a brief light-dim when the AC compressor starts is usually normal inrush, unless it's severe or getting worse, which can flag a loose connection or a marginal breaker. In a full flat the common causes are too many high-draw appliances on one circuit, a slightly undersized or ageing breaker, or a loose termination in the board that heats up and trips early. What tells you it's genuinely worth attention rather than just resetting: trips getting more frequent, the board or a socket warm to the touch, or a burning smell, any of those, stop and get it checked. A licensed electrician can measure the loads and rebalance circuits so the heavy appliances aren't fighting on one line, which usually solves it without touching the building supply. Get a licensed electrician in Al Nahda to check the board terminations too, loose connections are a real fire risk and hide behind exactly these symptoms.