Shophouse office trips under load: wiring worn at a tight bend
A converted shophouse office near Robertson Quay tripped its breaker only on the hottest, hardest-working afternoons, running fine the rest of the day. Heritage buildings here often leave no straight path for outdoor wiring, and a forced tight bend can wear through years before anyone suspects the run itself.
By Team Snowflake | Reviewed 11 Jul 2026
Case summary
Samsung Wall-mounted10 years oldOfficeSingapore River, Singapore
- Concern
- The office manager feared a failing compressor, priced well above a wiring repair.
- Found
- Wiring insulation worn through at a tight bend forced by the cramped condenser recess, shorting only under heavier load
- Key check
- Inspected the full wiring run through the recess before assuming a compressor fault
- Result
- The unit ran through the next stretch of hot afternoons without tripping again. The office avoided paying for a compressor replacement that was never the actual fault in the first place.
What we were told
The office manager said the unit tripped only on the hottest afternoons when it had been running hardest, and reset normally once the unit cooled down for a while. On milder days it ran for hours without any issue. The outdoor unit sits in a narrow recess between two older party walls.
What we checked
We treated the load-linked pattern as the first lead rather than opening the compressor. A trip that only shows up under heavier load, rather than at random or after rain, points more toward a wiring or connection issue that worsens as the system works harder and runs hotter.
The compressor tested normally when run in isolation on the bench.
The outdoor wiring had been forced around a tight bend to fit through the narrow recess.
Insulation at that bend had worn thin, exposing bare conductor at one point.
That worn section held up fine during light use, but lost contact once it heated up under sustained heavy load, matching the trip pattern exactly.
What we found
The recess between the two party walls left no room for a straight wiring run, so the original installer had to bend the cable sharply to fit. Over years of use, the insulation at that bend point wore thin, leaving a stretch of bare conductor exposed against the wall bracket. A worn, partly exposed section like that carries power poorly, and it heats up once the system works harder. The hotter it ran on the hardest afternoons, the worse that damaged section got, until it lost contact and tripped the breaker. On milder days the same spot stayed cool enough to hold, which is why the fault only ever showed up when the unit was working hardest.
What fixed it
We replaced the worn section of wiring and re-routed it with a wider bend radius where the recess allowed, rather than replacing the compressor, since the compressor tested correctly on its own. We advised checking the wiring clearance again at the next service given how little room the recess leaves.
Outcome
The unit ran through the next stretch of hot afternoons without tripping again. The office avoided paying for a compressor replacement that was never the actual fault in the first place.
What this case teaches us
A trip tied to load, not weather, points at the wiring run first
- A trip that appears only under heavy load and disappears once things cool down often points at wiring, not the compressor.
- Converted heritage buildings can force outdoor wiring around tight bends where a straight run was never possible.
- Ask for the full wiring run to be inspected before approving compressor replacement in an older converted building.
Related reading
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