Products 07/07/2010 Uninterrupted Power Source: High Demand The 9900 Series Uninterrupted Power Supplies from Mitsubishi Electric is now available in 300kVA/300kW- and 500kVA/500kW-rated models. The 9900 Series is designed for permanent installation in high-demand facilities that require consistent power delivery, such as data centers. Up to eight 9900 modules can be paralleled for either capacity or redundancy. Mitsubishi Electric Power Products; 724-772-2555; www.meppi.com Looking Up: Fastener Accessories for Overhead Work The Hilti GX 120-ME Gas-Actuated Fastener now is available with modular-pole- tool and ceiling-wire assemblies for overhead work. The tool can be used to install various fastening elements into overhead
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.