HVAC and electrical design Bill of quantities The installation plan defines the site configuration, installation instructions for telecom implementation, site layout for general arrangement drawings and requirements for construction design. This forms the basis of the bill of materials prepared and equipment is ordered from that for that particular site. General arrangement drawings include a local plan drawing describing legal government maps de- picting the building and the surroundings with reference to the true north direction. A rooftop site layout drawing describes the roof plan for building sites showing true north, antenna pole positions, indoor/outdoor/shelter locations, cable tray layout, lightning protection and equipment ground routing, roof paving stone layout and an approximation of an outdoor/shelter base frame system. Elevation Draw- ings depict the overall height of the building/tower as well as profile details. The detailed construction drawing contains drawings from foundations (concrete, reinforcement), framework (steel, concrete), complementary structures and holes. Statistical calculations, work instruc- tions and reports are added to the detailed design as documents. The HVAC and electrical design describes heating, piping, ventilation and air conditioning planning, electrical, grounding and lightning protection with drawings and documents. Once the site is made ready by the site engineering team the ordered equipment is delivered to the site and the installation teams are called on to start their work as given in the site plans and diagrams. The site is effectively grounded and all static electricity is eliminated before the equipment is made ready for permanent installation. All equipment is fastened tightly to the floor of the equipment room with the cables laid in a uniform fashion using an adequate colour-coding or numbering scheme. During the process of equipment installation, electrical connections are made between the mains power supply to the respective circuit breakers, leading to