Common Applications and Uses of Single Core Double Insulated Wires in Buildings

19 June 2019

Single core double insulated wires employ a best-of-both-worlds approach that should be familiar by now. From the get-go, the goal is to provide a cabling solution that exhibits high tensile strength. That, of course, is a feature that applies to the solitary, densely packed conductor zone.  Wrapping that solid power guide in two layers of insulation, the cabling gains enough mechanical protection to pass through any building area.

Designed For Tough Building Applications

Let’s get straight to the heart of the matter. Single core double insulated wires are designed to carry substantial amounts of power between building zones. If there’s a pair of power linkages in a structure that requires a mechanically tough hookup line, then this is the cabling that’s installed. Capable of carrying 450-to-750-Volts, high wattage appliances and power linkages utilize this cabling format. Looking deeper inside a structure, one that’s been wired with single core double insulated wires, you’ll see power distribution nodes, lighting circuits, heavy-duty motors, and much more besides, all wired up with this tough cabling. Just as a by-the-way, fewer motors and/or vibrational equipment housings favour this cabling, probably because, although designed to be high tensile conductors, solid wires fatigue quickly when placed in high-vibration applications.

Double-Insulated Determinations

Both layers of insulation, as found on this wiring type, are made out of PVC. Looking more closely, they’re two slightly different forms of PVC. The V90 inner coating is designed to stop current leakage and keep the transported power levels consistently high. The second layer, which is wrapped around the current insulating coating, is meant to act as a mechanical sheath. This 3V90 sheathing prevents the wires from gouges and scrapes in challenging routing situations. Remember, even if electrical wiring is placed safely between two walls, there are sharp wall studs and rough-edged construction materials back there, so the wiring can only benefit from an additional layer of protection. As laid out in the AS/NZS 3808 guidelines, insulating layers stop power losses. Sheathing, on the other hand, performs as a mechanical shield. At any rate, after the wiring is all hooked up, that easy-tear PVC sheathing comes away quickly to expose the colour-coded insulation.

Back inside a building, long lengths of single core double insulated wires are going about their duties. They’re installed carefully, although the outer sheathing is there to provide extra protection. Pulled into place, an electrician removes the sheathing, exposes the coloured insulation, and strips the two layers away. Stripped to the correct length, the orange-brown copper conductor is revealed. It’s not a multi-strand wire; it’s a single, robustly formed wire, which is designed to supply power circuits, lighting arrays, hoists and motors, and much more with lossless electrical energy.

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