The circuit is carrying more than it was built for
This is the most common cause in an older commercial building, and it is almost never a wiring fault. It is a layout that changed. Workstations were added, a kitchen got a second appliance, a room became a server room, heaters arrived in winter. The wiring is the same wiring, and one circuit is now carrying a load nobody planned for.
The tell is timing. If the trip happens at the same point in the day, or whenever a particular machine starts, the load is the cause. The fix is to redistribute the circuit, not to fit a larger breaker. A larger breaker on the same cable removes the protection and leaves the cable to take the heat.
Something on the circuit is faulty
A single failing appliance, a damaged lead, or a motor drawing far more than it should will trip a healthy circuit. Finding it is a process of elimination: unplug everything on the circuit, reset, then reconnect one item at a time and wait.
It is slow and it is the reliable method. In a working building it usually has to be done outside working hours, which is one reason it gets postponed.
There is a genuine earth fault
Moisture in a junction box, a rodent-damaged cable inside a wall, water reaching a fitting after a leak upstairs. These trip an earth leakage breaker rather than an overload one, and they are the cases where repeated resetting is genuinely dangerous.
Buildings in Lahore see this most after the monsoon and after any plumbing leak, sometimes weeks later, once water has tracked far enough to reach the wiring.
Why tracing takes the time it takes
In a commercial or institutional building, the wiring is rarely documented and rarely original. Circuits have been extended, boards relabelled or not labelled at all, and additions made by whoever was available at the time. Establishing what is actually on a circuit is most of the work, and it is the part that gets skipped when someone just replaces the breaker.
It is also why the second visit costs less than the first. Once a board has been traced and labelled properly, the next fault on it is a much shorter job.
What not to do while you wait
Do not fit a larger breaker, and do not bypass one. Both convert a circuit that protects itself into one that does not, and the failure mode after that is not a dark office.
If a board is tripping repeatedly and the cause is not known, keep the affected circuit off and run the essential equipment from a circuit that is healthy until someone has traced it.
This is work we do. Electrician & Electrical Works in Lahore covers the scope, and a site visit comes before any quote.