2. Wiring Method ao Non-metallic-sheathed cable was specified for most lighting branch circuits, and, for economy, standard service-drop cable for overhead services. Where protection against moisture or injury was required, aluminum conduit and fittings were specified for overhead installation, All wiring concealed in concrete walls or floors or underground, where direct-burial cable was not used, was specified as "TW" wire in hot-dipped galvanized conduit. Conduit, where required, was hot-dipped galvanized for concealed work and aluminum (when available) for exposed work, Flexible conduit connections were only used for short connections from outlets to meters and consisted of flexible steel conduit covered with a neoprene jacket to reduce corrosion. Power wiring was installed in rigid, hot-dipped, galvanized conduit and metal boxes (aluminum when available). Steel boxes, where installed on aluminum surfaces, were insulated by mounting on plywood fastened to the aluminum structure. This was done to eliminate electrolytic action that would otherwise cause accelerated corrosion. Where conduit was installed exposed, it was aluminum (when available) and was fastened to the structure with aluminum straps, bolts, etc, Overload a. eyen ces Circuit breakers were specified for circuit protection in the majority of installations. Breakers were the thermalmagnetic type. Lighting panels, which proved very satisfactory, were the MB or MO type. Most power panels were type MH, ML or ABQ, except in certain specific instances such as the laboratory building on Japtan. At this location, fused power panels were installed to permit easy increase or reduction of circuit capacity (changing fuse sizes) to suit changing requirements of laboratory equipment within the limits of wiring provided. Because of changes in construction schedules and slow delivery of panels on order, field changes were required. These changes involved the use of panels for buildings other than those for which they were ordered. In order to accommodate these panels and to avoid delay in construction, plans were revised as required. 5-126