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Cables 🇦🇺 WA / AustraliaHow deep do underground cables need to be buried?
For Category A or B underground wiring in open ground: at least 500 mm cover. Under at least 75 mm of continuous poured concrete: 300 mm. A Category C system (chased into rock and concreted) can be 50 mm. Category B also needs mechanical protection over it.
Open ground: 500 mmUnder ≥75 mm concrete: 300 mmCategory C: 50 mm
Regulation: AS/NZS 3000:2018 Table 3.5 (categories), Table 3.6 (depth of cover), Cl 3.11.
Study aid in plain English, not the text of the standard. Always check the current AS/NZS 3000:2018 + WA rules and your local rules. Electrical work must be done by a licensed or registered electrician.
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