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What is Precast Manholes Standard NNH001 about?

This document establishes the characteristics and tests that prefabricated manholes intended for underground duct access must meet. It describes two types of manholes (A-1 and A-2) made of concrete or plastic, with a capacity for 4 pipes. It specifies brands, design, and dimensions. It details qualification tests such as dimensional verification, mechanical tests on samples and manholes, and heat resistance for plastics.

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