067910 - Grounding Requirements For Outdoor Electrical .
PURPOSE AND SCOPE1. THIS DRAWING PROVIDES DESIGN PARAMETERS, APPLICATION AND ORDERING INFORMATION FOR GROUNDING OF EQUIPMENT, STRUCTURES,ETC. IN ELECTRICAL STATIONS INCLUDING TRANSMISSION AND DISTRIBUTION SUBSTATIONS AND SWITCHING STATIONS2. GROUNDING OF NON-CURRENT CARRYING METALLIC PARTS AND STRUCTURES TO LIMIT POTENTIAL GRADIENTS DURING GROUND FAULTCONDITIONS FOR PROTECTION OF PERSONNEL IN THE AREA AND MAINTAIN EQUIPMENT INTERGRITY AND RELIABLITY.3. GROUNDING OF NEUTRALS TO STABILIZE CIRCUIT POTENTIALS WITH RESPECT TO EARTH AND PROVIDE MEANS FOR CIRCUIT RELAYINGTO CLEAR GROUND FAULTS.4. GROUNDING FOR LIGHTNING AND SWITCHING SURGE PROTECTION.SUBSTATION7. THE GRID PERIMETER SHOULD ENCLOSE ALL ABOVE SURFACE GROUNDED METAL OBJECTS WITH AT LEAST 3 FT (6 FT PREFERRED)OUTSIDE CLEARANCE SPACING. SEE APPLICATION "S",THIS DRAWING, FOR REQUIREMENTS FOR HIGH VOLTAGE TOWERS AND POLES INSIDESTATION FENCE.8. PERIMETER GROUND RODS ARE TO BE SPACED AT 20-30 FT APART AND AT THE CORNERS OR AS DETERMINED BY GROUNDING ANALYSIS.INTERIOR GROUND RODS SPACED 50 FT APART AND AT SPECIAL LOCATIONS.9. 250 KCMIL MHD COPPER IS THE MINIMUM CONDUCTOR USED FOR GROUND GRIDS AND FOR CONNECTING STRUCTURES SUPPORTINGHIGH VOLTAGE BUS AND EQUIPMENT TO THE GRID. USE 500 KCMIL MHD COPPER CABLE FOR FAULT DUTY EXCEEDING 35KA.710. NO BOLTED CONNECTION IS TO BE USED ABOVE OR BELOW GROUND OR FOR TERMINATING GRID CONDUCTORS. USE APPROVED EXOTHERMICPROJECTSTANDARDOR APPROVED COMPRESSION CONNECTORS.NOTESSTATUS1. FOR MATERIAL USED FOR FENCE GROUNDING, SEE ES 020607.ACTIVE---UNITFACILITY COMPONENTDISCIPLINEELECTRICAL5. THE GROUND GRID SHALL BE BURIED 1’-6" MINIMUM BELOW UNFINISHED GRADE IN THE AREA WITHIN THE SUBSTATION SECURITY FENCE ANDTERMINATED NOT LESS THAN 8 FT FROM THE FENCE. THE FENCE SHALL BE GROUNDED SEPARATELY FROM THE GRID UNLESS OTHERWISE NOTEDON THE APPROPRIATE PROJECT DRAWING. FOR FENCE GROUNDING, SEE ES 020607.6. NEW STATION OR MAJOR STATION ADDITIONS WILL BE SPECIFICALLY ANALYZED TO DETERMINE THE APPROPRIATE GRID RESISTANCE ANDGRID SPACING TO ASSURE PERSONNEL SAFETY.FACILITY TYPESUBSTATIONFACILITY NAME---GROUND GRID SPECIFICATIONS2. SOFT DRAWN COPPER MAY BE SUBSTITUTED FOR MHD BY EPC CONTRACTORS WITH ENGINEERING PERMISSION3. THE AMPACITY OF 30% CONDUCTIVITY COPPERWELD 7#8 AND 19#8 CABLES ARE 10kA AND 25kA RESPECTIVELY. IF THESE CONDUCTORS AREFOUND,THE MAXIMUM SUBSTATION FAULT DUTY SHOULD BE VERIFIED TO BE LESS THAN THESE VALUES OTHERWISE, THEY SHOULD BE REPLACED.4. GROUND RODS ARE STEEL WITH A COPPER CLADDING. USE THE PROPER TOOLS FOR DRIVING THE GROUND ROD. IT IS IMPORTANT THATTHE COPPER CLADDING NOT BE DAMAGED TO THE EXTENT THAT THE STEEL IS EXPOSED AS THIS WILL LEAD TO CORROSION ANDDRAWING TYPEGROUNDING AND BONDINGBUSINESS LINEES 067911COPPER AND ALUMINUM POWER CONNECTORSES 046267ARRANGEMENT OF VOLTAGE TRANSFORMER (VT) AND COUPLING CAPACITOR VOLTAGE TRANSFOMER (CCVT).EDS 05810474-16-15CHANGED SHEETS 1, 3, 13, 15STDSXZOGOD69-22-14ADDED MATERIAL CODE FOR LYNCONITE SHEET 10STDSXZOGOD512-11-13CHANGED SHEETS 3, 10, 12 & 15.STDDLGISSUED FOR CONSTRUCTIONSTDREV.DATE: 3/2/2015DRAWING NO.GROUNDING DESIGN STANDARD DRAWING MASTER LIST1RASTER: NONEVECTOR:067910.EDSREFERENCES:CAD USER: SXZOSUBSTATION & TRANSMISSIONEVENTUAL FAILURE OF THE GROUND ROD.12-17-01DATEREVISION 1DSGR MILLENADWNR MILLENAGDAPVDB/MDWG LISTGROUNDING REQUIREMENTS FOR OUTDOORSUPSDS055962SUPSD BYSHEET NO 1 OF 15SHEETSSUBSTATION ENGINEERINGDRAWING NUMBERREVPACIFIC GAS AND ELECTRIC COMPANYAPVDDATEENGINEERING STANDARDM LYAPVDMPLJOB NO DSG/DWN CHKD SUPVELECTRICAL EC0 (8.5x11)SAN FRANCISCO, CALIFORNIA067910 7SCANIC
APPLICATIONS:(A). STRUCTURES:EACH ABOVE SURFACE GROUNDED METAL STRUCTURE THAT SUPPORTS ENERGIZED BUS SHOULD HAVE A MINIMUM OF ONE CONNECTION TO4THE GRID. MORE CONNECTIONS TO THE GRID ARE NEEDED IF:(1)THE STRUCTURE BASE AREA DIMENSION IS GREATER THAN 5 FT SQUARE OR SUPPORT ACTIVE DEVICES: (SWITCHES, BREAKER, ETC.),THEN TWO GROUND COPPER CONNECTIONS SHALL BE MADE ON DIAGONALLY OPPOSITE CORNERS.(2) STRUCTURE HAS FOUR OR MORE SEPARATE LEGS, SPACED 10FT OR MORE APART THEN EACH LEG OF STRUCTURE MUST BE CONNECTEDTO THE GROUND GRID.(B). AIR SWITCHES, CIRCUIT SWITCHERS:PROVIDE CONTINUOUS VISIBLE BONDING CONNECTION FROM OPERATING ROD(S) TO OPERATING PLATFORM. USE 250 KCMIL COPPER CABLEFOR BONDING. (SEE FIG 3 THROUGH FIG 7, THIS DRAWING).(C). POWER TRANSFORMERS:FOR 3-PHASE TRANSFORMER NEUTRALS (H0, X0), USE ONE GROUND CONNECTION PER BUSHING. FOR 4-WIRE SYSTEMS NEUTRAL, SEEAPPLICATION "E". FOR SINGLE AND 3-PHASE TRANSFORMER CASE GROUNDS, USE TWO GROUND CONNECTIONS PER TRANSFORMER PLACEDON DIAGONALLY OPPOSITE CORNERS FOR TANK GROUNDING.(D). NEUTRAL BUS FOR SINGLE PHASE EQUIPMENT:NEUTRALS FOR BANKS OF SINGLE-PHASE TRANSFORMERS OR REGULATORS SHALL BE MADE UP SEPARATELY FROM THE GROUND GRID - ON ANEUTRAL BUS MOUNTED ON INSULATORS - AND CONNECTED TO THE GRID ON ONE END WITH TWO GROUND CABLES. IN A MULTI-BANKINSTALLATION, NO MORE THAN TWO BANKS SHALL BE CONNECTED TO SAME NEUTRAL BUS AND THE CONNECTION TO THE GROUND GRID SHALLBE MADE AT A MID-POINT BETWEEN THE BANKS. ALL NEUTRAL BUSHINGS SHALL BE CONNECTED TO THE NEUTRAL BUS UNLESS OTHERWISESPECIFIED ON ARRANGEMENT DRAWINGS, AND THE APPROPRIATE NOTE SO SPECIFIES.(E). FOUR WIRE DISTRIBUTION:USE TWO 250 KCMIL COPPER CABLES FROM TRANSFORMER LOW VOLTAGE NEUTRAL (X0) TO GROUND GRID (SEE FIG 19, THIS DRAWING)AND FROM FEEDER TERMINATION STRUCTURE TO GROUND GRID (SEE FIG 17, THIS DRAWING). THE TWO CABLES SHALL BE ROUTED INSEPARATE TRENCHES TO DIFFERENT POINTS ON THE GROUND GRID.(F). POWER CIRCUIT BREAKER (PCB’S), HIGH VOLTAGE CIRCUIT CIRCUIT BREAKERS (HVCB’S)TWO GROUND CONNECTIONS FOR SKID MOUNTED PCB’S OR PER TANK FOR NON-SKID MOUNTED BREAKERS. FRAME MOUNTED BREAKERSSHALL HAVE TWO GROUND CONNECTIONS TO STATION GRID. THE TWO CABLES SHALL BE PLACED ON DIAGONALLY OPPOSITECORNERS. ONE #1/0 COPPER CONNECTION TO TERMINAL LUG OF HVCB STRUCTURE AND MAKE CONNECTIONS TO THE THRU BOLT OFTHE GROUND BUS ON THE BOTTOM OF THE CABINET. SEE FIG.11 THIS DRAWING. FOR BONDING OF BUSHING POTENTIAL DEVICES,SEE FIG. 29.(G). REGULATORS:THREE-PHASE REGULATORS SAME REQUIREMENTS AS OUTLINED IN APPLICATION "C", EXCEPT FOR 3-PHASE STEP REGULATORSOPERATING AT VOLTAGES 23KV AND BELOW, WILL BE OPERATED WITH THE NEUTRAL UNGROUNDED. FOR SINGLE- PHASE REGULATORS,SEE APPLICATION "D" AND "E". FOR SINGLE PHASE REGULATOR CASE GROUND, SEE APPLICATION "C".(H). CARRIER COUPLING CAPACITORS AND COUPLING CAPACITOR VOLTAGE TRANSFORMERS (CCVT):TWO GROUND CONNECTIONS TO COMBINATION GROUND TERMINAL AND CASE GROUND. (SEE FIG 23 AND FIG 24, THIS DRAWING).REFER TO EDS 058104 FOR ADDITIONAL GROUNDING INFORMATION.(I). POTENTIAL DEVICES/ VOLTAGE TRANSFORMERS:ONE GROUND CONNECTION TO COMBINATION GROUND TERMINAL AND CASE GROUND. FOR OTHER VOLTAGE TRANSFORMER GROUNDING,(SEE FIG 25 AND FIG 26, THIS DRAWING). REFER TO EDS 058104 FOR ADDITIONAL GROUNDING INFORMATION.(J). POWER CAPACITORS, SHUNT CAPACITOR BANKS AND AIR CORE REACTORS:AIR CORE REACTORS AND CAPACITOR HOUSING OR SUPPORTING STEEL RACKS SHALL HAVE TWO GROUND CONNECTIONS TO THE GRID,(SEE. FIG 10, FIG 16 AND FIG 22, THIS DRAWING).PENINSULA GROUNDING SYSTEM IS REQUIRED FOR TRANSMISSION SHUNT CAPACITOR BANKS. FOR PENINSULA GROUNDING, THE GROUNDCONDUCTORS ARE ELECTRICALLY CONNECTED TO THE MAIN STATION GROUND GRID AT ONLY ONE POINT AND TOTALLY ISOLATED FROM ALLFENCES, FENCE GROUNDS AND THE STATION GROUND GRID EXCEPT AT ONE POINT OF INTERCONNECTION. USE TWO (2) 500 KCMIL COPPERCABLES FOR 60KV THROUGH 230KV AND THREE (3) 500 KCMIL COPPER CABLES FOR 500KV SYSTEMS TO INTERCONNECT TO THE STATIONGRID AND EXTEND THE CONDUCTORS INTO THE CAPACITOR GROUND GRID AREA. (SEE FIG 2, THIS DRAWING). EACH CAPACITOR STEP ISINDIVIDUALLY FENCED. THIS GUARD FENCE SHOULD BE SEPARATED FROM THE MAIN GROUNDING GRID AND ALL OTHER EQUIPMENT BY ATLEAST 10 FEET, AND MAY JOIN ADJACENT CAPACITOR GUARD FENCE OF ANOTHER STEP IN THE SAME CAPACITOR BANK GROUP. CAPACITORGUARD FENCE SHALL NOT BE CONNECTED TO THE CAPACITOR GROUND GRID EXCEPT TO IT’S OWN GROUND RODS. CABLE PASSING UNDERCAPACITOR GUARD FENCE SHALL BE ISOLATED FROM FENCE BY PLACING CABLE IN 20 FEET LONG, 2" PVC PLASTIC CONDUIT.(SEE FIG 2, THIS DRAWING).(K). STEEL CONDUITS, JUNCTION BOXES, CABLE TRAYS AND RECEPTACLES (OUTDOOR):MUST BE BONDED TO STRUCTURE GROUND WITH ONE #4 AWG COPPER CABLE.(L). LOW VOLTAGE POTENTIAL TRANSFORMERS, STATION SERVICE TRANSFORMERS, DISTRIBUTION PANELS AND EQUIPMENT INDOORS:4ONE#4 AWG COPPER CABLE CONNECTION TO STRUCTURE GROUND. THE SIZE OF THE CABLE WOULD HAVE TO INCREASEIF THE FAULT DUTY AT THE DEVICE EXCEEDS ITS RATING. FOR STATION SERVICE TRANSFORMERS NORMALLY SUPPLIEDFROM TRANSMISSION TRANSFORMER BANK TERTIARY, THE MINIMUM GROUND CABLE IS 250 KCMIL CUENGINEERING STANDARDGROUNDING REQUIREMENTS FOR OUTDOORELECTRICAL SUBSTATIONSETEC0SEC (8.5x11)PG&E CO.SHEET2 OFSHEETSDRAWING NUMBERREV.067910 4MICROFILM
(M). METER AND RELAY CABINETS (SCADA) ETC:ONE #1/0 COPPER CABLE CONNECTION TO MAIN GROUND GRID AND VIA THRU BOLT AND 1-HOLE TERMINAL CONNECTORS MAKE CONNECTIONSTO THE SIDE OF THE CABINET AND THE GROUND BUS INSIDE THE CABINET.(N). CONTROL BUILDING AND BATTERY ROOM:USE TWO 250 KCMIL COPPER CABLES FROM THE OPPOSITE CORNERS OF THE BUILDING TO THE MAIN SWITCHBOARD COPPER GROUNDBUS BAR AND TIE TO SURROUNDING GROUND GRID. (SEE FIG 1, THIS DRAWING). ALL BUILDING STRUCTURES SHOULD BE LOCATEDAT A MINIMUM OF 11 FT AWAY FROM STATION FENCE. FOR METALLIC BUILDING, (SEE APPLICATION "U", THIS DRAWING).FOR BATTERY ROOM GROUNDING REQUIREMENTS, REFER TO EDS 4018144, "TYPICAL INSTALLATIONS OF BATTERIES AND RACKS".(O). LIGHTING STANDARDS:ALL LIGHTING STANDARDS SHOULD BE LOCATED INSIDE THE GROUND GRID PERIMETER . USE ONE #1/0 COPPER CABLE CONNECTIONTO GROUND GRID. FOR ADDITIONAL INFORMATION, REFER TO EDS 459076, "LIGHTING FIXTURE ASSEMBLY & MOUNTING DETAILS".(P). FENCE GROUNDING:REFER TO ES 020607 - "METHOD OF GROUNDING FENCES".(Q). PULL BOXES:IT IS NOT NECESSARY TO GROUND CABLE SUPPORTS OR COVER PLATE SUPPORTS IN PULL BOXES.REFER TO FIGURE 30 - DISTRIBUTION UNDERGROUND PRIMARY ENCLOSURE WITH METALLIC COVER.(R). LIGHTNING OR SURGE ARRESTERS:ARRESTERS MOUNTED ON TRANSFORMERS SHALL BE GROUNDED WITH ONE GROUND CONNECTION DIRECTLY TO GROUND ROD NEAR THETRANSFORMERS AND THEN CONTINUING THE CABLE TO GROUND GRID. (SEE FIG 20, THIS DRAWING). FOR FREE STANDING ARRESTERS,(SEE FIG 21, THIS DRAWING). MAKE GROUND CONNECTIONS DIRECT TO THE GRID WITH THE LEAST AMOUNT OF SHARP BENDS.(S). HIGH VOLTAGE TOWERS AND POLES INSIDE STATION FENCE:I)IF INSIDE PERIMETER GROUND, TIE TO GROUND GRID, (SEE APPLICATION A).II)IF OUTSIDE PERIMETER GROUND, TOWER MUST BE LOCATED 8 FT AWAY FROM THE GRID AND 8 FT AWAY FROM THE FENCE ANDGROUND PER TRANSMISSION LINE STANDARDS.III) IF OUTSIDE PERIMETER GROUND AND 8 FT CLEARANCE CANNOT BE MAINTAINED, CONTACT ENGINEERING FORSPECIFIC GROUND GRID DESIGN.IV) GUYS SHALL BE LOCATED INSIDE THE FENCE. DO NOT GROUND ANCHOR GUYS. MINIMUM DISTANCE FROM GROUND WIRETO GUY BOLT OR GUY WIRE IS 6". INSTALL TWO INSULATOR BOBS IN THE GUY WIRE 8’ MINIMUM ABOVE GROUND AND8’ MINIMUM FROM POLE.(T). SYNCHRONOUS CONDENSERS, SERIES CAPACITORS AND STATIC VAR COMPENSATION EQUIPMENT:THESE EQUIPMENT WILL HAVE THEIR OWN INDIVIDUAL DESIGNED GROUNDING STANDARDS BASED UPON THE MANUFACTURERS’RECOMMENDATIONS.(U). METALLIC BUILDINGS LOCATED OUTSIDE THE MAIN GROUND PERIMETER (NOT APPLICABLE TO CONTROL BUILDING AND BATTERY ROOM): 7INSTALL 250 KCMIL COPPER GROUND RING AROUND THE OUTSIDE OF THE BUILDING AND BOND TO THE BUILDING METAL STUDS ATOPPOSITE CORNERS WITH 250 KCMIL COPPER CABLE. THE GROUND RING SHOULD BE LOCATED 3 FT AWAY FROM THE BUILDING.(SEE FIG 1, DETAIL-A, THIS DRAWING).(V). GROUND WELL:USE AS A MEANS TO LOWER OVERALL RESISTANCE (TO REMOTE EARTH) OF A GROUND GRID SYSTEM WHEN IT IS DIFFICULT TO LOWERTHE RESISTANCE BY EXPANDING THE GRID ALONG A HORIZONTAL PLANE AS INDICATED BY SPECIFIC GROUNDING ANALYSISRECOMMENDATIONS. SEE FIGURE 28 THIS DRAWING.(W). EXISTING GROUND GRID CONNECTIONS:CONNECTIONS FROM EXISTING GROUND GRID TO NEW GROUND GRID CONDUCTORS SHOULD BE MADE WITH "HEAVY DUTY" EXOTHERMICMOLDS OR APPROVED COMPRESSION CONNECTORS AS SHOWN ON SHEETS 12-14.(X). HANDRAILS:METALLIC HANDRAILS, INCLUDING HANDRAILS ON STAIRWAY TO MPAC BUILDINGS, LOCATED INSIDE THE SUBSTATIONGRID PERIMETER MUST BE GROUNDED. CONNECT EVERY OTHER HANDRAIL POST WITH ONE #1/0 COPPER CABLE TO THE MAIN GROUND GRID.(SEE FIG 1, DETAIL- B, THIS DRAWING)(Y). FIRE ALARM CONTROL PANEL AND FIRE SUPPRESSION SYSTEM:MUST BE BONDED TO SWITCHBOARD COPPER GROUND BUS OR 250 KCMIL COPPER CABLE WITHIN THE CABLE TRAYIN THE BUILDING WITH ONE #4 AWG COPPER CABLEENGINEERING STANDARDPG&E CO.DRAWING NUMBERGROUNDING REQUIREMENTS FOR OUTDOORSHEETETEC0SEC (8.5x11)3 OFREV.7SHEETSMICROFILM
MIN6’-6"MIN3CONTROLBUILDINGFOR ALL EQUIPMENTTYPE GROUNDINGREQUIREMENTS,REFER TO APPLICATIONS(SH 2 & 3, THIS DRAWING)3CONNECTION TOSTRUCTURE, ETCGROUND TAPSEE 0"SUBSTATION SECURITY FENCE"PENINSULA"SHUNT CAPACTOR GROUNDING(SEE APPLICATION "J" FORALL OTHER CONDITIONS)FOR DETAIL,8’-0"SEE FIGURE 2MINTHIS DWGLOCATE ALL SUBSTATIONEQUIPMENT INSIDE THISGROUND GRIDGROUND RODSEE SPEC NOTE(8),THIS DWG, SH 1.6’-6" MIN3FENCE GROUNDINGSEE APPLICATION "P"THIS DWGTHIS LOOP NEEDS TO BE INSTALLED UNLESS THE GATEIS CONSTRAINED TO SWING IN ONLY ONE DIRECTION.FIGURE 1TYPICAL ARRANGEMENT OF GROUND GRID(SEE GROUND GRID SPECIFICATIONS, THIS DRAWING)BOND TO BLDG METAL STUDSAT OPPOSITE CORNERS WITH250KCMIL COPPER CABLE4GROUNDING LUGGROUNDING LUGPB250 KCMILCOPPER3’-0" MIN(TYP AROUND BUILDING)TO STATION250 KCMIL COPPERGROUND GRIDTO STATIONGROUND GRIDDETAIL-ADETAIL-BTYPICAL GROUNDING FOR METALLIC BUILDINGOUTSIDE OF THE GRIDTYPICAL GROUNDING FOR METALLIC HANDRAILSENGINEERING STANDARDGROUNDING REQUIREMENTS FOR OUTDOORELECTRICAL SUBSTATIONSETEC0SEC (8.5x11)PG&E CO.SHEET4 OFSHEETSDRAWING NUMBERREV.067910 4MICROFILM
XXXXXXXXXC3xxxxxxxxxTO FENCE AND STEEL POLEFENCESHUNT CAPACITOR BANK STEP #2xxxxxxxxxxXxxSHUNT CAPACITOR BANK STEP #1xTHIS DWGCONNECT GROUND RODGUARDSEE APPL "J"xGUARD FENCExxxxxxxxxxxXxCAPACITORSFIG 10, THIS DWGxxxREACTORSFIG 16, THIS CTORB\XREACTORA\xxxxxxxxxxxxxxx20’ LENGTH,SEE APPL "J"THIS DWGXGROUND SW’SFIG 7, THIS DWG500 KCMILCOPPER FIG 11, THIS DWGSUBSTATION SERCURITY FENCECC2"PVC CONDUIT,DISC. SW’SFIG 3 THRUFIG 6 THISDRAWING500 KCMILCOPPER CABLETO MAIN GROUND GRIDX(CONTINUED ON FIG 1, SH 4)XBUS SUPPORTSTRUCTUREFIG 12, THIS DWGXCXXXXXXXXFIGURE 2TYPICAL GROUNDING ARRANGEMENT FOR 2 STEPS 500KV, SHUNT CAPACITOR BANKS(SEE APPLICATION "J" FOR ALL OTHER CONDITIONS)ENGINEERING STANDARDGROUNDING REQUIREMENTS FOR OUTDOORELECTRICAL SUBSTATIONSETEC0SEC (8.5x11)PG&E CO.SHEET5 OFSHEETSDRAWING NUMBERREV.067910 3MICROFILM
Edge of platformto be approx. 6"from center lineof control rod6"Do not connectstructure groundnear platform bond.Copper cableto stationground"Y"Show location of platform(Dimension "Y")on Arrangementof foundation dwg.FIGURE 3GROUNDING FOR TYPICALSTEEL STRUCTURE INSTALLATIONSteel Barfor 2 ormore SwitchesFlexible Copper BraidFurnished by SwitchManufacturerBar Lug, OffsetOperatingPlatformOperatingPlatformCopper Cable" x 1" Everdur CapscrewCode 19-3022 and " EverdurNut, Code 19-5013Bar Lug, OffsetFIGURE 4FIGURE 5GROUNDING & BONDING ARRANGEMENTGROUNDING & BONDING ARRANGEMENTFOR ONE SWITCHFOR TWO OR MORE RECONTROL CAB.(SHOWN BEHIND)CONTROL CAB.(SHOWN BEHIND)TERMINALLUGFLEXIBLECOPPER BRAIDTERMINALLUGOPERATINGPLATFORM222CIRCUIT SWITCHERWITHOUT DISCONNECT SWITCHCIRCUIT SWITCHER/MOASWITH DISCONNECT SWITCHFIGURE 6GROUNDING FORMOAS AND CIRCUIT SWITCHERSENGINEERING STANDARDGROUNDING REQUIREMENTS FOR OUTDOORELECTRICAL SUBSTATIONSETEC0SEC (8.5x11)PG&E CO.SHEET6 OFSHEETSDRAWING NUMBERREV.067910 2MICROFILM
SWITCH BASESSEE NOTE AEXOTHERMICCONTINUOUSRUNNOTES(A) CONNECTION TO SW BASESAND STRUCTURE LISTED ONAPPROPRIATE BILL OFMATERIALS.FIGURE 7FENCEOPERATOR SUPPORTSTRUCTURE(SEE NOTE A)MIN3’-0"GROUNDING OF GROUND 3’-0"OPERATING ROD3’-0"MOLDINGMIN8’-0"3’-0"MIN.MIN.CONTROL RODSUPPORTMIN3’-0"GROUND GRIDNOTESGROUNDGRIDGROUND ROD(A) GROUND PAD ON OPERATOR SUPPORT STRUCTURE SHALL BELOCATED AS SHOWN(B) FOR BONDING OF PLATFORM, (SEE FIG 5, THIS DRAWING)NOTES(C) IF GROUND SW IS USED, RUN ONE GROUND CONDUCTOR FROM GRIDTO SW BASE, (SEE FIG 7, THIS DRAWING)SEE APPLICATION "S"-IV.SUBSTATION APPLICATION ONLY.FIGURE 8FIGURE 9GROUNDING AIR SWITCH WITHGROUNDING OF OPERATORFIBERGLASS CONTROL ROD ON WOOD POLESUPPORT STRUCTURECAPACITOR RACK2SEE APPL "J"THIS DWGTERMINAL LUGLOCATED ONFAR ENDHVCBSTRUCTURECONTROLCABINETTO COPPER BAR(INSIDE CABINET)LOCATED ONOPPOSITECORNERTERMINAL LUGGROUND CONNECTIONSTO STATION GRIDFIGURE 10GROUNDING FORGROUNDING OFSHUNT CAPACITOR BANKSHIGH VOLTAGE CIRCUIT BREAKERSENGINEERING STANDARDGROUNDING REQUIREMENTS FOR OUTDOORELECTRICAL SUBSTATIONSETEC0SEC (8.5x11)FIGURE 11PG&E CO.SHEET7 OFSHEETSDRAWING NUMBERREV.067910 2MICROFILM
3 FT (MIN)GROUND GRIDS AND CONDUITS SHALLBE ARRANGED IN SUCH A WAY THATTRENCHES ARE AT A MINIMUM OF6 FT FROM DEADEND STRUCTURES.IF GROUND GRID CROSSES ANYCONDUIT RUNS, GROUND GRIDSHALL BE ABOVE THE CONDUITSRUNS.SPACE FORPORTABLEGROUNDING TOOLS1’-6"6 FT (PREFERRED)SHAPE GROUNDCABLEAS SHOWNGROUND CABLE SHAPEFIG 13, THIS DWGTUBULARSTRUCTUREMIN1’-6"AVOID TRENCHINGCLOSE TO FOUNDATION(SEE FIG 14)FIGURE 13FIGURE 12PROVISION FOR ATTACHINGGROUNDING DEADEND (TENSION) STRUCTURE.PORTABLE GROUND TOOLS1"CONDUIT TRENCHFOUNDATION4545GROUNDGRIDBAR LUGMIN.1’-6"MIN.2’-0"EXOTHERMICPREFFERED TERMINATION FOR COPPER CABLE ABOVE GROUND AS SHOWN.USE ALLOY HARDWARE ("EVERDUR" OR "DURIUM" TYPE) FOR ALLCONNECTIONS TO STRUCTURES AND EQUIPMENT.FIGURE 14FIGURE 15FOUNDATION CLEARANCES(MINIMUM DISTANCE OF TRENCH PARALLEL WITHTYPICAL DETAIL OF ANFOUNDATION FOR TRANSFORMERS, HVCB’S, ETC.)EXOTHERMIC CONNECTIONPLAN VIEW3’-0" MINREACTORMETALLIC GROSS BRACE(IF CROSS BRACING ISNON-METALLIC GROUNDALL INSULATOR SUPPORT,SEE FIG 22, THIS DWG).(4-WIRE SYSTEM)(3-WIRE SYSTEM)INSULATORELEVATIONREACTORSTRUCTUREGROUNDING FORSTRUCTURE FOR UNDERGROUND FEEDER TERMINATIONSERIES REACTORSOR NEUTRAL CURRENT LIMITING REACTORENGINEERING STANDARDGROUNDING REQUIREMENTS FOR OUTDOORELECTRICAL SUBSTATIONSETEC0SEC (8.5x11)FIGURE 17FIGURE 16PG&E CO.SHEET8 OFSHEETSDRAWING NUMBERREV.067910 1MICROFILM
Ho Xo X1X2X3Ho Xo X1X2X333TRANSFORMERCASE GROUND(FAR SIDE)SEE APPL "C"THIS DWGTRANSFORMERCASE GROUND(FAR SIDE)SEE APPL "C"THIS DWGTOGROUNDGRIDTOGROUNDGRIDFIGURE 18FIGURE 19GROUNDING OF TRANSFORMERGROUNDING OF TRANSFORMER(3-WIRE SYSTEM)(4-WIRE SYSTEM)LIGHTNINGARRESTERSEE APPL "R"LIGHTNING ARRESTERSEE APPL "R"CLAMP TYPE TERMINAL(SUPPLIED WITH ARRESTER)33TRANSFORMERCASE GROUND(FAR SIDE)SEE APPL "C"THIS DWGGROUNDLOK TEELIGHTNINGARRESTERSTRUCTURECABLE-FLAT(CONTINUOUS RUN)TERMINAL LUG(2 PCS)TOSTATIONGROUNDGRID33TO STA GNDGROUND RODGROUNDRODFIGURE 20FIGURE 21GROUNDING FOR FREE STANDINGTRANSFORMER WITH LIGHTNING ARRESTERLIGHTNING ARRESTERSTO STA GNDHV EQUIPMENT(CAPACITOR,REACTOR, ETC)INSULATOR(TYP)INSULATORHV EQUIPMENT(CAPACITOR,REACTOR, ETC)FOUNDATIONSEE APPL "A"(THIS DWG)TO STATION GRID(PLAN VIEW)(ELEVATION)FIGURE 22TO STATIONGRIDGROUNDING FOR STRUCTURESWITH MULTIPLE INSULATOR BASESWITH NO CROSS METALLIC BRACING SUPPORTENGINEERING STANDARDGROUNDING REQUIREMENTS FOR OUTDOORELECTRICAL SUBSTATIONSETEC0SEC (8.5x11)PG&E CO.SHEET9OFSHEETSDRAWING NUMBERREV.067910 3MICROFILM
CCVTCCVTTERMINAL LUG(2-HOLE)TERMINAL LUG(2-HOLE)250 KCMIL COPPERTERMINAL LUG(2-HOLE)250 KCMILCOPPERCABLE-FLAT(1-HOLE)CABLE-FLAT(1-HOLE)#2 AWG CUTERMINAL LUG(2-HOLE)TERMINAL LUG(2 CABLES TO2-HOLE NEMA)#2 AWG CUTERMINAL LUG(2-HOLE)TERMINAL LUG(2 CABLES TO2-HOLE NEMA)STATION GRID2-GROUND CONNECTIONTO STATION GRID2-GROUND CONNECTIONSTO STATION GRIDNOTE:REFER TO APPL "H"FOR MORE INFORMATIONNOTE:REFER TO APPL "H"FOR MOR
use 250 kcmil copper cable from transmission transformer bank tertiary, the minimum ground cable is 250 kcmil cu if the fault duty at the device exceeds its rating. for station service transformers normally supplied 4 one#4 awg copper cable connection to s
Grounding Study and Analysis: Substation Grounding Practices Grounding Concepts - GPR and Touch Potential AEP Innovative Grounding Study Methods Grounding Installation: Traditional Approach and Challenges Grounding Application and Installation Change Management Testing: Grounding Integrity Testing Conclusion and .
Bruksanvisning för bilstereo . Bruksanvisning for bilstereo . Instrukcja obsługi samochodowego odtwarzacza stereo . Operating Instructions for Car Stereo . 610-104 . SV . Bruksanvisning i original
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Article 250.1 Scope. Article 250 is organized into 10 different parts that deal with specific requirements with regards to bonding and grounding. The specific parts are as follows: (I) General (II) System Grounding (III) Grounding Electrode System and Grounding electrode Conductor (IV) En
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