A-A
SERVICE
TRANSFORMER
SECONDARY
A
1 GROUND ROD
LENGTH SEPARATION
MINIMUM OF 10'
EXOTHERMIC WELD
CONNECTION (TYP)
GROUNDING KEY NOTES
1
B
TRANSFORMER FRAME GROUND
BOLTED ON CONNECTION
C
10'x 3/4" COPPER CLAD
GROUND ROD
(TYP OF 2)
EXOTHERMIC WELD
CONNECTION
3
4
CONNECTION TO LIGHTNING PROTECTION
SYSTEM (IF APPLICABLE)
EXOTHERMIC WELD
CONNECTION (TYP)
5
1
2
10'x 3/4" COPPER CLAD
GROUND ROD
(TYP OF 2)
25' MIN.
N
5
NATURAL GAS OR
PROPANE SERVICE
3
BUILDING STEEL
6
APPROVED GROUNDING
METHOD
(SEE GENERAL NOTE 1)
2
NEUTRAL CONDUCTOR SIZED TO MATCH PHASE CONDUCTORS MINIMUM.
PLANS AND ONE-LINES FOR ADDITIONAL INFORMATION.
REFER TO FLOOR
EQUIPMENT GROUNDING CONDUCTOR SIZED BASED ON SWITCHGEAR MAIN OVERCURRENT
PROTECTION DEVICE PER NEC TABLE 250-122. REFER TO FLOOR PLANS
FOR ADDITIONAL INFORMATION.
5/8" X 10' COPPERCLAD
GROUND ROD
PLAN VIEW
REFER TO DWGS. TELECOM DRAWINGS FOR ADDITIONAL INFORMATION.
TRANSFORMER GROUND RING SHALL CONSIST OF MINIMUM 1/0 BARE COPPER CONDUCTOR
BURIED MINIMUM 12" FROM EDGE OF TRANSFORMER FOUNDATION AND 18"-24" BELOW
FINAL GRADE. PROVIDE MINIMUM OF TWO (2) 10'-0"X 3/4" COPPER CLAD GROUND RODS
DRIVEN AT OPPOSITE CORNERS. PROVIDE ADEQUATE GROUNDING WHIP FOR BOLTED
CONNECTION TO TRANSFORMER FRAME GROUND. PROVIDE EXOTHERMIC WELDS OF GROUND
RING TO GROUND RODS AND GROUNDING WHIP TO RING. DO NOT CONNECT TO BUILDING
SERVICE GROUND.
TOP OF FOUNDATION
2'
PROVIDE ENGRAVED NAMEPLATE ON ALL GROUND CABLE CONNECTIONS AT THE BUS BAR
AND AFFIX WITH WIRE TIES.
GROUND BAR
6
6
6
6
PEDESTAL GROUNDING DIAGRAM
NO SCALE
SECTION A-A
NOTES:
TRANSFORMER GROUND MAT DETAILS
NO SCALE
EXOTHERMIC WELD
CONNECTION
6
PROVIDE SCREW FASTENED
LAMACOID LABELS IDENTIFYING EACH
GROUND BAR CONNECTION
ELECTRIC POWER GROUNDING DETAIL
SCALE: NONE
GENERAL NOTES:
1. A GROUNDING JUMPER SHALL BE PROVIDED AROUND THE
WATER OR GAS METER AND BACKFLOW PREVENTER.
2. PVC CONDUIT IS THE PREFERRED METHOD OF PROTECTION FOR
THE GROUNDING CONDUCTORS. DISCUSS WITH PSU ENGINEERING
SERVICES FOR ANY DEVIATIONS.
#4/0 AWG, SOFT
DRAWN TINNED SOLID
COPPER CONDUCTOR
CADWELD CONNECTION
10"Ø x 42" GROUND ACCESS
WELL WITH STEEL COVER,
SIMILAR TO HARGER MODEL
360P42 WITH COVER 10PS.
3/4" x 10' COPPER
CLAD GROUND ROD
GROUND ROD ACCESS WELL DETAIL
SCALE: NONE
AT LEAST 25% OF PEDESTAL SHALL BE GROUNDED.
2.
GROUNDING CLAMP AND BUSHING SHALL BE APPROVED TYPE
FOR RAISED FLOOR SYSTEM.
4.
4
TWO HOLE BOLTED
CONNECTION (TYP)
1.
3.
ALL WORK ON THIS DETAIL SHALL BE THE RESPONSIBILITY OF THE
ELECTRICAL CONTRACTOR UNLESS OTHERWISE NOTED.
COMMON GROUNDING BAR IN ELECTRIC
ROOM (MIN. 4"x1/4"x 24"), 2-HOLE
LUGS, MOUNTED TO ELECTRIC ROOM
WALL WITH INSULATED STANDOFFS
BONDING CONDUCTOR
TO NEXT
PEDESTAL
#4 AWG BARE
STRANDED
COPPER WIRE
DRILL 1"Ø HOLE IN THE UPPER
CORNER OF FOUNDATION FOR
GROUND WIRE ENTRANCE.
#2/0 BARE
COPPER
TELECOMM ROOM
GROUND BAR
EXOTHERMIC
WELD
CONNECTION
RAISED FLOOR
DO NOT CUT
THE GROUND WIRE
FINISHED
GRADE
GROUND ROD
SERVICE
ENTRANCE
EQUIPMENT
NEUTRAL BAR
GROUND CLAMP
BOLLARD (WHERE REQUIRED)
TELECOMMUNICATIONS ROOM MAIN GROUND BUSBAR GROUNDING CONDUCTOR SHALL BE
MINIMUM 4/0 AWG.
APPROVED GROUNDING
METHOD (SEE GENERAL NOTE 1)
3
#2/0 7-STRAND BARE SOFT
DRAWN COPPER WIRE DIRECT
BURIED 2' BFG (TYP).
FRONT
GROUNDING ELECTRODE CONDUCTOR SIZED BASED ON PHASE CONDUCTORS PER NEC
TABLE 250.66, MINIMUM OF 1/0 AWG. REFER TO FLOOR PLANS FOR ADDITIONAL
INFORMATION.
WATER SERVICE
EXOTHERMIC WELD
CONNECTION
LAY-IN GROUND
BUSHING LUG
PROVIDE 15' WIRE TAILS INSIDE
FOUNDATION.
TRANSFORMER CONCRETE
FOUNDATION.
#4/0 AWG SOLID SOFT DRAWN
TINNED COPPER CONDUCTOR
CADWELD CONNECTION
3/4" x 10' COPPER CLAD
GROUND ROD
GROUND ROD DETAIL
SCALE: NONE
ALL THE DEVICES SHALL BE PLATED TO PROVIDE LOW CONTACT
RESISTANCE
GROUNDING CLAMP AND BUSHING SHALL BE SIZED BASE ON SIZE
OF PEDESTAL AND GROUND WIRE.
SERVICE
TRANSFORMER
SECONDARY
A
1 GROUND ROD
LENGTH SEPARATION
MINIMUM OF 10'
EXOTHERMIC WELD
CONNECTION (TYP)
GROUNDING KEY NOTES
1
B
25' MIN.
N
TRANSFORMER FRAME GROUND
BOLTED ON CONNECTION
C
10'x 3/4" COPPER CLAD
GROUND ROD
(TYP OF 2)
5
EXOTHERMIC WELD
CONNECTION
3
3
4
CONNECTION TO LIGHTNING PROTECTION
SYSTEM (IF APPLICABLE)
EXOTHERMIC WELD
CONNECTION (TYP)
1
2
10'x 3/4" COPPER CLAD
GROUND ROD
(TYP OF 2)
5
NATURAL GAS OR
PROPANE SERVICE
BUILDING STEEL
6
APPROVED GROUNDING
METHOD
(SEE GENERAL NOTE 1)
2
NEUTRAL CONDUCTOR SIZED TO MATCH PHASE CONDUCTORS MINIMUM.
PLANS AND ONE-LINES FOR ADDITIONAL INFORMATION.
REFER TO FLOOR
EQUIPMENT GROUNDING CONDUCTOR SIZED BASED ON SWITCHGEAR MAIN OVERCURRENT
PROTECTION DEVICE PER NEC TABLE 250-122. REFER TO FLOOR PLANS
FOR ADDITIONAL INFORMATION.
GROUNDING ELECTRODE CONDUCTOR SIZED BASED ON PHASE CONDUCTORS PER NEC
TABLE 250.66, MINIMUM OF 1/0 AWG. REFER TO FLOOR PLANS FOR ADDITIONAL
INFORMATION.
TELECOMMUNICATIONS ROOM MAIN GROUND BUSBAR GROUNDING CONDUCTOR SHALL BE
MINIMUM 4/0 AWG.
REFER TO DWGS. TELECOM DRAWINGS FOR ADDITIONAL INFORMATION.
TRANSFORMER GROUND RING SHALL CONSIST OF MINIMUM 1/0 BARE COPPER CONDUCTOR
BURIED MINIMUM 12" FROM EDGE OF TRANSFORMER FOUNDATION AND 18"-24" BELOW
FINAL GRADE. PROVIDE MINIMUM OF TWO (2) 10'-0"X 3/4" COPPER CLAD GROUND RODS
DRIVEN AT OPPOSITE CORNERS. PROVIDE ADEQUATE GROUNDING WHIP FOR BOLTED
CONNECTION TO TRANSFORMER FRAME GROUND. PROVIDE EXOTHERMIC WELDS OF GROUND
RING TO GROUND RODS AND GROUNDING WHIP TO RING. DO NOT CONNECT TO BUILDING
SERVICE GROUND.
PROVIDE ENGRAVED NAMEPLATE ON ALL GROUND CABLE CONNECTIONS AT THE BUS BAR
AND AFFIX WITH WIRE TIES.
WATER SERVICE
EXOTHERMIC WELD
CONNECTION
APPROVED GROUNDING
METHOD (SEE GENERAL NOTE 1)
SERVICE
ENTRANCE
EQUIPMENT
TELECOMM ROOM
GROUND BAR
EXOTHERMIC
WELD
CONNECTION
3
NEUTRAL BAR
GROUND BAR
6
6
6
6
#4/0 AWG, SOFT
DRAWN TINNED SOLID
COPPER CONDUCTOR
4
6
COMMON GROUNDING BAR IN ELECTRIC
ROOM (MIN. 4"x1/4"x 24"), 2-HOLE
LUGS, MOUNTED TO ELECTRIC ROOM
WALL WITH INSULATED STANDOFFS
BONDING CONDUCTOR
EXOTHERMIC WELD
CONNECTION
TWO HOLE BOLTED
CONNECTION (TYP)
#4/0 AWG SOLID SOFT DRAWN
TINNED COPPER CONDUCTOR
10"Ø x 42" GROUND ACCESS
WELL WITH STEEL COVER,
SIMILAR TO HARGER MODEL
360P42 WITH COVER 10PS.
PROVIDE SCREW FASTENED
LAMACOID LABELS IDENTIFYING EACH
GROUND BAR CONNECTION
3/4" x 10' COPPER
CLAD GROUND ROD
CADWELD CONNECTION
3/4" x 10' COPPER CLAD
GROUND ROD
CADWELD CONNECTION
GENERAL NOTES:
1. A GROUNDING JUMPER SHALL BE PROVIDED AROUND THE
WATER OR GAS METER AND BACKFLOW PREVENTER.
2. PVC CONDUIT IS THE PREFERRED METHOD OF PROTECTION FOR
THE GROUNDING CONDUCTORS. DISCUSS WITH PSU ENGINEERING
SERVICES FOR ANY DEVIATIONS.
GROUND ROD ACCESS WELL DETAIL
SCALE: NONE
GROUND ROD DETAIL
REVISION: 1.1
SCALE: NONE
REVISION LOG
1.0
1.1
DATE
10/2014
ORIGINAL
EDIT GROUND BAR CALLOUT DETAIL 02/2016
PSU OPP STANDARD DETAIL
TITLE: TYPICAL GROUNDING DETAILS
SCALE: NONE
PAGE #1 OF 1
DETAIL #: 260526-D01
DATE: 10/20/2014