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I'm laying an armoured cable in a trench for an outdoor light circuit, and future proofing by laying a second armoured cable to be used in the future for a garage. I know the indiviudal guages of wiring needed for both circuits, but I'm not sure about any impact of running two cables in a single trench, e.g. do they need to be separated from each other by a certain distance, is the guage of wire needed for each circuit affected by having another cable close by, etc?
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