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Page | 1. WATER MAIN INSTALLATION INSTRUCTIONS. These are the specifications for installation of water main, services and hydrants and all. Water Main Specifications. Specifications. Provide information on approved materials, installation methods and typical drawings. EXCAVATION. First and foremost the initial step in Water Main Installation is excavation. · BEDDING. Bedding means preparing a platform for placing the pipes ( 'Network Modelling of Water Mains guidance document Guidelines for the highest number of service connections; installation of new mains on bothThe trench has to be a minimum of 750mm deep to protect the pipe from frost. How To Install Water Mains. Installation of wall boxes . with Water Supply (Water Fittings) Regulations 'Pipe Materials Selection Manual' published by. WRAS. wras.co.uk. 1 Installing your supply pipe guide. Installing your supply pipe. New supply pipe(s) must be installed in accordance with the Water Supply (Water Fittings).