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® WorleyParsons <br /> resources&energy <br /> Manholes will be provided as required for cable installation. Each manhole will be <br /> provided with a sloped floor to a 2'X2'x2' deep sump for pumping out water with a <br /> portable submersible pump. Duct banks will be sloped toward manholes where possible. <br /> The slope determination will be made to suit site conditions. <br /> Hazardous area classifications and fire rated barrier requirements will be identified by the <br /> design engineer. <br /> 4.21 Grounding <br /> The facility grounding grid system will consist of buried stranded copper conductors and <br /> ground rods, and ground wells as required. The buried grounding conductors will be sized <br /> on actual maximum available fault current in the switchyard. Exothermal welded type <br /> connectors that meet the requirements of IEEE 837 will be used for the buried ground grid <br /> connections. Exothermal welded connectors will be used above ground for connection of <br /> the ground grid to building steel. NEMA approved crimp on cable lugs will be used for <br /> connection of the ground grid to equipment. <br /> The ground resistivity will be measured in accordance with IEEE 81 or ASTM G57. The <br /> ground grid will be designed so that the step, touch, and mesh potentials are within <br /> acceptable levels per IEEE 80 and IEEE 695. The calculated ground grid resistance will be <br /> verified by measuring final grounding resistance by Fall-of-Potential method per IEEE 81. <br /> The ground grid design will take into account the nearby substation and will be tied into the <br /> grid of the substation in at least 2 places. <br /> Equipment and electrical systems in the plant power block area will be grounded in <br /> accordance with the Owner's standard grounding details, the National Electrical Code <br /> (NEC) and IEEE 142. All major electrical equipment will be grounded directly to the <br /> ground grid. The communication, instruments, and control cable shields will be grounded <br /> per the Owner's standard grounding details, IEEE 789, the turbine supplier's requirements, <br /> and the DCS supplier requirements as applicable. <br /> 4.22 Cathodic Protection <br /> Because of the potential hazard in case of a leak, cathodic protection will be provided for <br /> all buried, coated-carbon-steel pipe including natural gas pipes. The cathodic protection <br /> system for buried pipes will be sacrificial galvanic anode system unless soil conditions or <br /> pipe size require the use of an impressed current system. Cathodic protection will be <br /> designed to meet NACE RP-01-69. <br /> All underground piping systems, tanks, large heat exchangers, condensers will be reviewed <br /> for cathodic protection by the Owner prior for release for manufacturing on installation. <br /> Field-erected storage tank bottoms will be set on a concrete ring-wall or slab foundation. <br /> Lodi Energy Center 3.4- 15 LEC AFC <br /> 071608 Rev.A <br />