PG&E_Trench_Packet.pdf
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- Attached to
- River Park Electrical Relocation
- Solicitation number
- PK-26-15096-QB
- Issued by
- Santa Cruz County, California
About this file
This is a technical specification document issued by Pacific Gas and Electric Company (PG&E) detailing requirements for overhead and underground panel board construction for electrical service installations. The document, revised June 30, 2023 (Revision 16), establishes comprehensive standards applicable to residential, commercial, and agricultural service installations served from PG&E's lines. It provides detailed specifications for construction materials, dimensions, footing requirements, fasteners, clearances, and grounding procedures. The specifications cover wood and metal post materials, board and panel dimensions ranging from 48 to 96 inches in length with heights between 36 and 42 inches, concrete footing requirements with minimum 36-inch depth, and conduit installation requirements including sweep radius recommendations of 10 feet per inch of conduit diameter and minimum 24-inch bend radius for service and secondary conduit. The document includes seven figures illustrating typical panel board constructions for both underground and overhead installations, along with a material list table identifying 23 items to be furnished and installed by the customer, including pull boxes, metering equipment, conduit, posts, and grounding components.
The specifications establish mandatory construction standards to ensure safety, durability, and compliance with PG&E operational requirements. All wood materials must be pressure-treated on all surfaces, while metal components require galvanized steel or stainless steel construction with rust inhibitors. The document requires minimum 36 inches of clear working space in front of panel structures, meter heights between 60 and 75 inches measured from final grade to center, maximum equipment height of 84 inches from ground, and minimum 6 inches ground clearance for all equipment. For underground services exceeding 100 feet, a pull box must be installed between 6 and 30 feet from the panelboard. The specifications reference compliance with the National Electrical Code (NEC), local ordinances, and specific PG&E documents including the Electric and Gas Service Requirements Manual (Greenbook) and Electric Meter Work Practices (EMWP). This document directly applies to the River Park Electrical Relocation project in Watsonville, California, which involves removal of existing electrical service and construction of new PG&E electrical service at 100 East Front Street.
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CONDUIT, TRENCHING & BACKFILL:
- 4" OF SAND IS REQUIRED ABOVE & BELOW CONDUIT IF NATIVE SOILE IS NOT FREE OF
ROCKS, HARDPAN, ETC. BACKFILL SHALL MEET APPROVAL OF PG&E INSPECTOR
- SERVICE CONDUIT: 063928, PAGE 2 TABLE 1, 2 & 3 (COMMERCIAL / INDUSTRIAL)
- PROVIDE LONG CONDUIT SWEEPS WHERE INDICATED. RECOMMEND SWEEP RADIUS
(10' OF RADIUS PER INCH OF CONDUIT DIAMETER) EX: 4" CONDUIT = 40' RADIUS
- INSTALL 24" MINIMUM BEND RADIUS FOR SERVICE AND SECONDARY CONDUIT
REQUIRED PERMITS
OH: Services UG-1: Services
Greenbook
EMWP
Rev. #16: 6/30/2023 065374 Page 1 of 9
Daniel Jantz (DWJ7)
065374
Function:Asset Type:
Issued by: Date: 6/30/2023
Rev. #16: This document replaces PG&E Document 065374, Rev. #15. For a description of the changes, see Page 9.
OVERHEAD AND UNDERGROUND PANEL BOARD CONSTRUCTION
Prepared by: SXZO
DesignElectric Metering
This document also is included in the following manuals:
• Electric and Gas Service Requirements Manual (Greenbook)
• Electric Meter Work Practices (EMWP)
References Location Document Requirements for Customer-Owned Poles OH: Services/Greenbook 025055 Location, Clearances, and Mechanical Protection Details for Pad-Mounted and Subsurface Equipment UG-1: General/Greenbook 051122 Voltage Stabilizer for 480 Volt, Three-Phase, 3-Wire Ungrounded Service OH: Meters/EMWP 052497 Agricultural Underground Service, 500 hp or Less UG-1: Services/Greenbook 054619 Agricultural Overhead Service, 300 hp or Less OH: Services/Greenbook 058087
Purpose and Scope
This document illustrates the requirements applicable to residential, commercial, and agricultural overhead or underground service installations served from PG&E’s lines. This document is applicable where panel-type structures are used to mount customer-owned and installed equipment.
General Information
1. Construction Materials and Requirements
Ensure that all posts and panels on which the service and metering equipment are mounted meet the following minimum requirements. Equipment can be mounted to a panel, boards, or struts. See Note 5 on Page 3 for the maximum rating of service termination equipment.
A. Material Treatment and Specifications
(1) Ensure that the surface areas on all wood posts, boards, and solid panels are pressure treated, including the sides and areas that have been cut. Any other treating process that provides an equivalent penetration and retention must be approved by PG&E. Acceptable wood preservatives are water-borne salts and pentachlorophenol. Brush application of wood preservatives is ineffective and therefore unacceptable.
(2) Pipe posts must be galvanized rigid steel.
(3) All metal boards or solid metal panels must be rigid steel and have a rust inhibitor applied to all surface areas.
(4) Strut channels, fittings, and associated hardware must be stainless steel or galvanized steel.
http://www/techlib/default.asp?body=manuals/greenbook/ http://www/techlib/default.asp?body=manuals/elec_meter_work_practices/ http://wwwedm3/cgi-bin/getdocTDM.asp?itemid=981550065 http://wwwedm3/cgi-bin/getdocTDM.asp?itemid=981550065 http://wwwedm3/cgi-bin/getdocTDM.asp?itemid=981550065 http://wwwedm3/cgi-bin/getdocTDM.asp?itemid=981900029 http://wwwedm3/cgi-bin/getdocTDM.asp?itemid=981900029 http://wwwedm3/cgi-bin/getdocTDM.asp?itemid=981900029 http://wwwedm3/cgi-bin/getdocTDM.asp?itemid=981900029 http://wwwedm3/cgi-bin/getdocTDM.asp?itemid=981830029 http://wwwedm3/cgi-bin/getdocTDM.asp?itemid=981830029 http://wwwedm3/cgi-bin/getdocTDM.asp?itemid=981830029 http://wwwedm3/cgi-bin/getdocTDM.asp?itemid=981830029 http://wwwedm3/cgi-bin/getdocTDM.asp?itemid=981900043 http://wwwedm3/cgi-bin/getdocTDM.asp?itemid=981900043 http://wwwedm3/cgi-bin/getdocTDM.asp?itemid=981900043 http://wwwedm3/cgi-bin/getdocTDM.asp?itemid=981600029 http://wwwedm3/cgi-bin/getdocTDM.asp?itemid=981600029 http://wwwedm3/cgi-bin/getdocTDM.asp?itemid=981600029
Greenbook
EMWP
Overhead and Underground Panel Board Construction
Rev. #16: 6/30/2023065374 Page 2 of 9
General Information (continued)
B. Material Dimensions
(1) Structure: All structures must be a minimum length of 48 inches. For structures up to 72 inches long, the minimum combined height of the boards, panel, or struts must be 36 inches. For structures up to 96 inches long, the minimum combined height of the boards, panel, or struts must be 42 inches. For structures with lengths greater than 96 inches, use additional posts. The top of the structure must not exceed 84 inches high from the ground. There must be a minimum of 6 inches of clearance between the ground and all equipment, panels, boards, or struts.
(2) Boards: Place side by side.
(a) Wood: Minimum 2 inches thick by 12 inches wide (nominal).
(b) Metal: Minimum 1/2 inch thick by 12 inches wide.
(3) Panel: One solid sheet.
(a) Wood: 1 inch thick.
(b) Metal: 1/4 inch thick.
(4) Unistrut: At a minimum, two struts are needed to support each piece of service and metering equipment. It is recommended that one strut be attached towards the top and one strut be attached towards the bottom of the equipment. Add struts for additional equipment with different length dimensions. Use struts with or without boards or panels.
(a) Strut channel dimensions must be a minimum 1-1/2 inch x 1-1/2 inch. See Figure 10 on Page 8.
(5) Posts: Use a minimum of two posts to support panel-type construction. Add more posts if the construction exceeds the structural dimensions listed in Note 1B(1) on Page 1. If applicable, a PG&E-approved, customer-owned pole can be used as one of the posts. The customer-owned pole must be installed in accordance with Document 025055 and the panel board must be attached to the poles as shown in Figures 8 on Page 5 and Figure 10 on Page 8.
(a) Wood: Solid.
(i) Square, 6 inches by 6 inches cross section.
(ii) Round, 8 inches in diameter.
(b) Metal: Solid or hollow. If hollow a permanent post cap is required.
(i) Square, 3 inches by 3 inches cross section.
(ii) Round, 3 inches in diameter.
C. Footing and Support
(1) Place all posts in the center of a 12 inches minimum diameter concrete footing. Extend the footing a minimum of 36 inches into the ground (excluding gravel bedding), a minimum of 4 inches above ground level, and have a 1/2 inch slope away from the post to allow for drainage.
D. Fasteners
(1) For wood posts, use minimum 3/8 inch x 5 inches lag screws.
(2) For metal posts, use 3/8 inch minimum through bolts with nuts and washers.
(3) For Unistrut, use approved fasteners and hardware made for the strut channels. This should include through bolts with nuts and washers.
E. Screw Holes or Openings
(1) All unused or exposed screw holes and openings must be tightly secured by plugging or filling the entire hole with screws, bolts, or other type of metal fasteners. Sealants can be used along with the screws, bolts, and other metal fasteners.
F. Clearances and Barrier Posts (see Document 051122)
(1) A minimum 36 inches of clear and level working space must be maintained in front of the panel board structure at all times.
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Greenbook
EMWP
Overhead and Underground Panel Board Construction
Rev. #16: 6/30/2023 065374 Page 3 of 9
(2) If any part of the panel board structure is located within 36 inches of a thoroughfare or road, then install barrier posts. If the thoroughfare or road has high vehicular traffic and the panel board structure is less than 108 inches (9 feet) away, then install barrier posts.
(3) The panel board and customer owned pole (if installed) must not be located less than 10 feet from the surface of the PG&E pole or within 10 feet of the vertical plane of a PG&E line.
2. Grounding
The customer is responsible for bonding and grounding metering and service termination equipment enclosures.
See the requirements in Greenbook Section 5.8. Grounding, including Figures 5−15 and 5−16. Also Ground and bond in accordance with the National Electrical Code (NEC) and local ordinances. PG&E prefers, but does not require, the grounding electrode conductor wire to be protected against physical damage by rigid steel conduit or armored cladding
3. A voltage stabilizer for 3-wire service will be furnished and installed by PG&E (see Document 052497).
4. Properly identify and mark meters as described in Section 5.5.1 on Page 5-10 of the Electric and Gas Service Requirements Manual (Greenbook).
5. Termination or metering equipment with an ampacity rating greater than 400 amps, 1-phase or 3-phase must be pad-mounted (free standing). Refer to Electric and Gas Service Requirements Manual (Greenbook), Section 9.10.
6. The minimum meter height for electric panels with current transformers (CT’s) is 60 inches as measured from final grade to the center of the meter. The maximum meter height is 75 inches.
7. Enclosure: For services greater than 100 feet install a pull box between 30 feet maximum and six feet minimum away from the Panelboard. See document 028028 Secondary Electric Underground Enclosures for the required minimum size enclosure to install.
http://wwwedm3/cgi-bin/getdocTDM.asp?itemid=981830029 http://www/techlib/default.asp?body=manuals/greenbook/default.asp http://www/techlib/default.asp?body=manuals/greenbook/default.asp http://www/techlib/default.asp?body=manuals/greenbook/ http://wwwedm3/cgi-bin/getdocTDM.asp?itemid=981900015
Greenbook
EMWP
Overhead and Underground Panel Board Construction
Rev. #16: 6/30/2023065374 Page 4 of 9
Typical Panel Board Construction
Notes
1. See Table 1 on Page 8 for the material list.
2. Item 2 may be replaced by Items 1 and 3.
3” Min. Galv. Rigid Steel Pipe or 6” x 6” or 8” Dia. Wood Post (see 1.B.(5) on Page 2)
Concrete Footing
36” Min.
Height
36” Min.
4” Min.
Figure 1 Panel Board Construction With Struts
12” Min.
6” Min. Ground Clearance to Equipment or Panels
1/2” Slope
84” Max.
Height
42” Min.
Height
Figure 2 Large Panel Board Construction With Struts
6” Min. Ground Clearance to Equipment or Panels
36” Min.
4” Min.
See 1.B.(1) on Page 2
1/2” Slope
See Note 1D on Page 2 for Fasteners
84” Max.
Height
48” - 72” Length
48” − 96” Length
See Note 1D on Page 2 for Fasteners
Panels, Boards, or Struts
42” Min.
Height
3” Min. Galv. Rigid Steel Pipe or 6” x 6” or 8” Dia. Wood Post
6” Min. Ground Clearance to Equipment or Panels
36” Min.
4” Min.
36” Min.
1/2” Slope
Panels, Boards, 36” Min.
Height
84” Max.
Height 4”
Min.
36” Min.
Concrete Footing
See 1.B.(1) on Page 2
1/2” Slope
12” Min.
6” Min. Ground Clearance to Equipment or Panels or Struts
Figure 3 Panel Board Construction
Figure 4 Large Panel Board Construction
84” Max.
Height
48” - 72” Length
48” - 96” Length
Greenbook
EMWP
Overhead and Underground Panel Board Construction
Rev. #16: 6/30/2023 065374 Page 5 of 9
Typical Underground Panel Board Construction
As Required See Document 063927 or Document 0639281
Figure 5 Underground Service With Second Meter Panel
30’ Max − 6’ Min.
Note: This type of configuration is acceptable for mounting multiple meters.
See Note 7 on Page 3 and Table 1 Footnote on
6” Min.
Increase Trench Depth to Accommodate for the Vertical Radial Bend
Note: See Figure 7 on Page 6 for an al-ternate elbow & cou-pling Option
Voltage Stabilizer
Voltage Stabilizer Alternate Location
To Load
Control Equipment
2 3 4
8 9
Figure 6 Underground Service Using Panel Board Construction
As Required See Document 063927 or Document 063928
See Note 3 on Page 3
See Note 6 on page 3
6” Min.
Increase Trench Depth to Accommodate for the Vertical Radial Bend
30’ Max − 6’ Min.
See Note 7 on Page 3 and Table 1 Footnote on
Note: See Figure 7 on Page 6 for an al-ternate elbow & cou-pling Option http://wwwedm3/cgi-bin/getdocTDM.asp?itemid=981900047 http://wwwedm3/cgi-bin/getdocTDM.asp?itemid=981900041 http://wwwedm3/cgi-bin/getdocTDM.asp?itemid=981900047 http://wwwedm3/cgi-bin/getdocTDM.asp?itemid=981900041
Greenbook
EMWP
Overhead and Underground Panel Board Construction
Rev. #16: 6/30/2023065374 Page 6 of 9
Figure 7 Alternate Option − PVC Elbow (Item 23) &
Plastic−to−Steel Adapter / Coupling (Item 20)
6” Min.
Increase Trench Depth to Accommodate for the Vertical Radial Bend
A support structure is required 6 inches minimum to 12 inches maximum above grade for coupling support. The support must be the same type (strut or treated board) as the rest of the panel board
12” Max.
Greenbook
EMWP
Overhead and Underground Panel Board Construction
Rev. #16: 6/30/2023 065374 Page 7 of 9
Typical Overhead Panel Board Construction
Figure 8 Overhead Service With Second Meter Panel
Note: This type of configuration is acceptable for mounting multiple meters.
13 14
See Note 6 on page 3
Control Equipment
See Note 3 on Page 3
Alternate Location
4 7
Figure 9 Overhead Service Using Panel Board Construction
18 17
See Note 6 on page 3
Voltage Stabilizer
Do Not Offset Conduit More Than 12 Inches
Greenbook
EMWP
Overhead and Underground Panel Board Construction
Rev. #16: 6/30/2023065374 Page 8 of 9
Figure 10 Typical Strut Channels Used for Panel Board Construction
1-1/2” Min.
1-1/2” Min. 1-1/2” Min.
1-1/2” Min.
Table 1 List of Material To Be Furnished and Installed by Customer
Item Description
1 Underground Pull Box, Required 1
2 Self-Contained, Bused Safety Socket Box
3 Combination Meter and Current Transformer Cabinet (See Note 6 on Page 3)
4 Main Switch of Service Equipment Enclosure
5 Service Conduit, As Required
6 UG Panel Board Construction (See Figures 5 − 6)
7 OH Panel Board Construction (See Figures 7 − 8)
8 Post (See Note 1 on Page 1)
9 Conduit, Riser, Galvanized Rigid Steel, Continuous without Couplings
10 Ground Rod (See Note 2 on Page 3)
11 Ground Wire, Copper, Bare
12 Ground Clamp (As Required) for Item 10
13 Sealable Gutter
14 Metal Myers Hub With Close Nipple
15 Heavy Duty 2-Hole Pipe Strap Every 36”
16 PVC Schedule 40, minimum
17 Weatherhead
18 PG&E-Approved, Customer-Owned Pole
19 Termination Enclosure
20 Plastic−to−Steel Adapter/Coupling
21 Conduit, Bend, Galvanized Rigid Steel, Continuous without Couplings
22 Service Conduit, Coupling, As Required
23 Conduit, Bend, PVC, Continuous without Couplings
1 The pull box is required to be installed but may be exempt only at the discretion of the PG&E inspector.
Greenbook
EMWP
Overhead and Underground Panel Board Construction
Rev. #16: 6/30/2023 065374 Page 9 of 9
Revision Notes
Revision 16 has the following changes:
1. Revised Note 5 on Page 3.
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