Office Trips Under Load: Wiring Worn at a Tight Bend

Communication faults on a system whose condenser sits in a cramped position, forcing the cabling into a sharp turn where it enters. The rest of the run is straight and well supported. The faults are intermittent and have worsened gradually over time.

A well-supported run with one sharp bend has a single obvious candidate, and looking there first costs nothing. Insulation forced round a radius tighter than the cable allows is stretched on the outside of the curve and compressed on the inside, and both weaken it. Add years of thermal movement and the material fails at exactly that point. The tightest bend deserves checking before any electrical test.

Cable insulation tolerates being bent within a specified radius and no further. Forced tighter it is permanently stretched on the outer face, and that stress does not relax with time. Thermal cycling then works the material at its weakest point until it cracks and the conductor is exposed. The installation was tidy and everything else about it is correct; the position simply did not leave room for a proper turn.

The bend is opened out to a proper radius, which usually means a small change in how the cable approaches the unit rather than a different cable. Where the position genuinely cannot accommodate it, a more flexible cable type or a purpose-made entry solves it. The point worth carrying is that a cramped position is a design constraint on the cabling too, not only on the equipment.