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200 pair cable with 0.40mm copper conductors, cellular polyethylene insulated, jelly filled core, unit twin type with moisture barrier. You can only trace a cable that is conductive, usually those with copper or aluminium conductors, or lead sheaths. Optical fibre cables usually need a trace rod and sonde to be fed into the duct to produce traceable EMF fields for the locator, however some cables are fitted with trace wire/detectable marker tape, although this is Read more…

Here we can see the electrical line marked in orange, at a nominal depth of 650mm. Depth readings can only be given at points along the line where the electromagnetic field is ’round’ i.e. not significantly affected by distortion from other fields. Quality level B (QL-B) represents significant risk reduction, with a spatial accuracy of +/- 300mm horizontally and +/- 500mm vertically. While this sounds like a massive tolerance, keep in mind the approach distances Read more…

💡 This refers to the Classification of Subsurface Utility Information. 🚦 When Underground Service Locators mark out the location of infrastructure on your property or work site, they will generally mark the different assets in colours coded to the Australian Standard (or inform you otherwise). 🤓 These ground markings will be accompanied by information such as a letter eg ‘E’ for electrical lines, a depth reading if the signal is not distorted, and a quality Read more…