Ground levelness

2019-04-06View Original

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Pits such as drainage ditches and cable trenches that are 20 cm deep and 10 cm wide must be fitted with covers, and the height difference between the edge of the cover and the surrounding horizontal surface must not exceed 5 mm. Are there **such industry standards or requirements?

Reply #22019-04-17

Give it a push; I want to know about this standard too. Could anyone provide a standard guideline for this? Please share

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Ground levelness

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