Harmandere, Pendik

Harmandere is densely built five and six storey apartment stock south of the E-5. In these buildings the shared riser feeding the flats from the meter panel was dimensioned years ago for far lower demand; as air conditioning, tumble dryers and electric water heaters are added per flat, the riser heats up in the evening. When the voltage on upper floors falls below 200 volts the boiler cannot ignite and LED lamps flicker, and that flicker is not a lamp fault but a clear symptom of voltage drop.

Readings are taken under load at the riser head and the flat intake, and percentage drop calculated from run length and cross-section. Where it exceeds five percent, upgrading the riser to 4x16 or 4x25 mm² NYY cable is presented to the building management with the measurement report; as an interim step loads are balanced across phases and carbonised busbar terminals renewed with fire-rated ceramic blocks. Because Harmandere is tightly terraced, no drill is used at night and the fault is traced silently with a cable tracer.

If breakers trip in Harmandere when the air conditioners start on a summer evening, the first job is measuring inrush with a clamp meter. In most flats the units hang off a socket circuit and peak at thirty-five to forty amperes on start-up; the existing C16 breaker sees that surge thermally and opens. Enlarging the breaker is not the answer, because it leaves the 2.5 mm² cable unprotected and raises the fire risk.

The correct installation runs a dedicated circuit from the board to the outdoor unit: 3x2.5 or 3x4 mm² according to power, a C20 or C25 motor characteristic breaker and its own residual current device. In multi-split flats like those in Harmandere, all three phase currents and the neutral are read separately and loads redistributed across the busbar, because air conditioning clustered on one phase heats the neutral terminal to around one hundred and sixty degrees. The interconnecting cable is specified screened and the condensate line is never routed below a socket.

If a concealed run in Harmandere breaks or starts leaking, there is no need to chase the wall end to end. The fault is first narrowed branch by branch at the board, then the route is followed from the surface with an inductive cable tracer and a FLIR thermal imager. A terminal heating under load shows as a clear hot spot on the thermal image and the area to be opened drops to centimetre scale.

Where the leakage is in an under-screed or underground run, a cable fault locator usually narrows the point to within a metre and only that area is opened. If the existing conduit is sound the cable is renewed along the same route with a draw wire; if the conduit is crushed, fire-retardant surface trunking is used. Where breaking is unavoidable its extent and cost are reported in writing first, and nothing is cut at a Harmandere address without approval.