Duct Pipe & Fittings SolutionsRoyal Electrical Solutions complete line of Duct Pipe and Fittings are used for hydro and underground utilities. It's the choice of contractors, utilities and municipalities. It can be used for both direct burial and concrete encased applications for power utility primaries and secondaries, street lighting and communication distribution systems. Standard: Certified CSA C22.2 No. 211.1.