B08_Solicitation_Attachment_7_CT_metering_ESR_0001.pdf

PDF 1 MB Posted Feb 20, 2024

Attached to: Upgrade Electrical Service, Redwood NP Federal contract opportunity
Solicitation number: 140P8424Q0021
Issued by: Department of the Interior National Park Service

About this file

Written by GovTribe AI · Feb 20, 2024

This solicitation requests quotations for electric service upgrades at Redwood National and State Parks in Crescent City, California. The contractor shall provide all labor, equipment, testing, and supplies to upgrade electrical service at the Headquarters Building, including supervision and work identified in project specifications and drawings. The requirement is estimated between $25,000 to $100,000. Quotations are due by the date specified from small businesses only classified under NAICS code 238210 with $19 million annual receipts. The government will award a firm-fixed-price purchase order to the responsible offeror with the most advantageous quotation based on price and evaluation factors. A site visit is scheduled for February 14, 2024 at 1pm Pacific Time with an RSVP required.

View the file

Other files for this federal contract opportunity

Other files attached to Upgrade Electrical Service, Redwood NP, newest first.
File	Type	Posted
B12_Miscellanious_Correspondence_Questions_and_Answers_ATT_5_REDW_Electrical_0001.pdf	PDF	Feb 20, 2024
B11_Site_Visit_Sign_In_Sheet_ATT_6_REDW_Electrical_0001.pdf	PDF	Feb 20, 2024
Sol_140P8424Q0021_Amd_0001.pdf	PDF	Feb 20, 2024
Sol_140P8424Q0021.pdf	PDF	Feb 7, 2024
B03_DOL_Wage_Determination_REDW_Electrical.pdf	PDF	Feb 7, 2024
B08_Solicitation_ATT_4_Tech_Info_Form_140P8424Q0021.docx	DOCX document	Feb 7, 2024
A06_Specifications_REDW_Electrical.pdf	PDF	Feb 7, 2024
A06_Drawings_REDW_Upgrade_Electrical.pdf	PDF	Feb 7, 2024

On GovTribe

Work with this file on GovTribe

Download the original file
Contacts named in this file
Similar government files
Ask GovTribe AI about this file

Try for free Login

Text version

The file's text, extracted by GovTribe without its formatting.

Section 9 2022 Electric Service Requirements

9.4 CT Metering, Up to 800 A

This section describes metering requirements for services rated up to 480 V and 800 A.

Motor loads with horsepower values greater than 60 hp at 120 V/208 Y, three-phase, and 125 hp at 277 V/480 Y, three-phase shall be metered with current transformer metering.

Table 25 identifies customer-provided material for CT metering. The Power Company will provide and install the meter, a meter test switch, current transformers, and secondary metering wiring.

Table 25—Customer-Provided Material T a b le 2 0

Provided by Customer See Notes

Meter socket EUSERC 339 CT-metering socket

CT cabinet Table 26 l A weather-tight, NEMA 3R-rated EUSERC CT cabinet sized in accord-ance with Table 26.

l The door shall be hinged and capable of being sealed

CT mounting base Section 9.4.2 l EUSERC CT mounting base rated for 50,000 A fault current l Cable termination can only be made on the manufacturer-supplied studs/ connectors of the transformer mounting base.

l No alteration of the transformer mounting base is allowed

Conduit Section 9.4.5 The conduit between the meter socket enclosure and the CT cabinet, see Section 9.4.4.

Connectors / terminations

Connectors for the load-side conductors to CT mounting base, as well as overhead service.

Bonding Section 9.4.6 Bonding per Section 9.4.5 for all meter and CT enclosures.

86 This manual shall be distributed and interpreted in its entirety. Individual pages will not represent all the requirements necessary for an installation. Printed ver-sions of this document may be out of date. Please consult the Power Company websites for the most recent version. © 2022 PacifiCorp..

Figure 51—Typical Installation of 800 A CT Metering Installation

The cabinet is exclusively for Power Company metering equipment. The CT cabinet consists of two parts, the enclosure and the mounting base for the current transformers.

Table 26—CT Cabinet Requirements T a b le 2 2

Type of Service EUSERC # for CT Cabinets

Minimum Cabinet Dimensions

EUSERC # for CT Mounting

BaseWidth Height Depth

Single-phase, 401-800 A 316, 317 24″ 48″ 11″ 328A

Three-phase, 201-800 A 316, 318 36″ 48″ 11″ 329A

2022 Electric Service Requirements Section 9

This manual shall be distributed and interpreted in its entirety. Individual pages will not represent all the requirements necessary for an installation.

Requirements:

1. Only equipment associated with Power Company metering shall be permitted in the

CT cabinet.

2. The door shall have factory-installed handles and hinges for side opening and shall be sealable.

3. The door shall be equipped with a device to hold it in the open position at 90°.

4. For underground services, the bottom half of the CT can is reserved for line side conduit and conductors. For overhead services, the top half of the CT can is reserved for line side conduit and conductors. For an alternate configuration, refer to Larger CT Can section.

5. The customer’s load side conduits must exit the cabinet on the load side of the CT can.

6. The CT cabinet should be installed such that it remains plumb for the duration of the ser-vice and does not hinder/imped the opening and closing of the door.

7. The top of the CT mounting base shall not be more than 72 inches above the finished grade.

8. Customer conductors are not permitted in the Power Company’s termination space.

9. The customer shall not terminate their principal (main) grounding electrode conductor in the CT cabinet or use it as a junction point for grounding or grounding electrode conductors.

10. For multiple metered circuits, a separate termination pull box must be provided for the Power Company underground service conductors. The CT cabinet shall not be used as a load distribution center.

11. The meter socket shall be located opposite the hinged side, and not above or below the cabinet.

Figure 52—CT Cabinet, Mounting Base Orientation

88 This manual shall be distributed and interpreted in its entirety. Individual pages will not represent all the requirements necessary for an installation. Printed ver-sions of this document may be out of date. Please consult the Power Company websites for the most recent version. © 2022 PacifiCorp..

9.4.1 Alternate CT Can Configuration

1. Where both line and load conductors enter or exit from the top or bottom of the cabinet a cab-inet is required. The dimension of the cabinet shall be 48″W × 48″H × 14″D. (These dimensions are greater than EUSERC 316 and 318 minimums.)

2. The door shall have factory-installed handles and hinges for side opening and shall be sealable.

3. The doors shall be equipped with a device to hold them in the open position at 90°.

4. The meter socket can be mounted on either side of the cabinet but not above or below it.

5. The position of the conduits will determine which side of the can is reserved for line and which side for load. If the line side of the conduit is on the left half of the can, the left half of the can shall be reserved for the line conductors. If the line side of the conduit is on the right half of the can, the right half of the can shall be reserved for the line conductors.

6. The customer’s load side conduits must exit the cabinet on the load side of the CT can.

7. The CT cabinet should be installed such that it remains plumb for the duration of the service and does not hinder/imped the opening and closing of the door.

Figure 53—Alternate CT Can Configuration

F ig u re 4 6

2022 Electric Service Requirements Section 9

This manual shall be distributed and interpreted in its entirety. Individual pages will not represent all the requirements necessary for an installation.

9.4.2 CT Mounting Base

CT mounting bases shall conform to EUSERC 328A, Figure 54, or EUSERC 329A, Figure 55. EUSERC 328B and 329B are also acceptable.

Requirements:

1. The CT mounting base shall meet the ratings for the available fault current at the location installed (50,000 A minimum).

2. For existing four-wire delta services, the high (power) leg conductor must be identified by orange marking, and located on the right hand bus position. The bus shall also be marked and readily identified.

3. The mounting base shall accept bar-type current transformers only.

4. No alteration of the mounting base is allowed.

5. Line and load-side cable terminations on EUSERC 328A or 329A CT landing pads require two bolts per connector.

6. Cable termination can only be made on the manufacturer-supplied studs of the transformer mounting base.

Figure 54—CT Mounting Base Single-Phase, Three-Wire, 800 A Maximum, EUSERC 328A

F ig u re 4 7

90 This manual shall be distributed and interpreted in its entirety. Individual pages will not represent all the requirements necessary for an installation. Printed ver-sions of this document may be out of date. Please consult the Power Company websites for the most recent version. © 2022 PacifiCorp..

Figure 55—Mounting Base, Three-Phase, Four-Wire, 800 AMaximum, EUSERC 329A

F ig u re 4 8

9.4.3 Meter Socket Enclosures for CT Meters

Figure 56—CT Metering for Free-Standing Installations, 600 V, 800 AMaximum

F ig u re 4 9

2022 Electric Service Requirements Section 9

This manual shall be distributed and interpreted in its entirety. Individual pages will not represent all the requirements necessary for an installation.

Table 27—CT Meter Socket Types, EUSERC 339

Type of Service Socket Type

Single-phase 6 -Jaw

Three-phase 13-Jaw

9.4.4 CT Metering, Free-Standing

The Power Company allows free-standing installations on posts.

Free-standing installations are owned by the customer.

Installation requirements for service to free-standing installations are listed below. These requirements are in addition to the general requirements given in this section.

Requirements:

1. The customer shall consult the Power Company to determine a readily accessible loc-ation of the free-standing meter installation.

2. The free-standing meter socket shall meet all local ordinance requirements.

3. The meter socket shall be protected from damage by use of barrier posts or other suit-able protection approved prior to installation by the Power Company.

4. The CT cabinet must be properly supported with a minimum of two 3-inch steel posts with installed caps, or two wood post no less than 6″ × 6″ (nominal) and pressure-treated with an American Wood Preservative Association approved preservative. When equip-ment is less than 72 inches apart, it shall be bonded according to the NESC.

5. The customer shall furnish, install and maintain posts, hardware, conduit, fittings, and concrete pads sufficient to support the metering.

Figure 57 illustrates a typical meter installation using steel posts.

F ig u re 4 9

92 This manual shall be distributed and interpreted in its entirety. Individual pages will not represent all the requirements necessary for an installation. Printed ver-sions of this document may be out of date. Please consult the Power Company websites for the most recent version. © 2022 PacifiCorp..

9.4.5 CT Metering Conduit

The customer must provide conduit between the meter socket and the CT cabinet. When installing conduit, the following requirements shall be met:

1. Conduit shall be 1-inch IMC, Schedule 40 PVC, or greater.

2.The meter socket must be within 12 inches from the CT cabinet.

3. Proper fittings and bushings shall protect metering conductors.

9.4.6 CT Cabinet Bonding

The CT cabinet must have a supply side bonding jumper and must be grounded per the NEC. Figure 58 illustrates one acceptable solution.

2022 Electric Service Requirements Section 9

This manual shall be distributed and interpreted in its entirety. Individual pages will not represent all the requirements necessary for an installation.

Figure 57—CT Metering for Free-Standing Installations, 600 V, 800 AMaximum

Figure 58—NEC-Accepted CT Cabinet Bonding, 600 V, 800 AMaximum

F ig u re 5 0

9.4.7 Combination Direct-Connect and CT Metering

Installations requiring both direct-connect and CT metering services shall meet the requirements of both types of services as described in the previous sections. An approved wall-mounted equipment installation is shown below. Switchboard combination units are also allowed. Refer to Section 9.5, SwitchboardMetering up to 4000 A for requirements.

94 This manual shall be distributed and interpreted in its entirety. Individual pages will not represent all the requirements necessary for an installation. Printed ver-sions of this document may be out of date. Please consult the Power Company websites for the most recent version. © 2022 PacifiCorp..

Figure 59—Combination Direct-Connect and CT Metering

F ig u re 5 1

9.5 Switchboard Metering up to 4000 A

A EUSERC-approved switchboard metering section is required when the service entrance rating is greater than 800 A. Switchboard metering may also be used for three-phase services over 200 A or single-phase services over 400 A.

The following table lists applicable EUSERC drawings for switchboard metering:

Table 28—EUSERC Switchboard References T a b le 2 4

EUSERC No. Figure References Switchboard with remote meter socket 325, 326, 345 Figure 60

Termination underground service 345 Figure 61 overhead service 348 Figure 61

CT compartment

0 to 800 A, 1-phase 0 to 1000 A, 3-phase

320 Figure 64, Figure 65

1001 to 3000 A 322 Figure 66 above 3000 A 324 Figure 67

Meter socket remote mount 339 Figure 60

2022 Electric Service Requirements Section 9

This manual shall be distributed and interpreted in its entirety. Individual pages will not represent all the requirements necessary for an installation.

F ig u re 5 2

96 This manual shall be distributed and interpreted in its entirety. Individual pages will not represent all the requirements necessary for an installation. Printed ver-sions of this document may be out of date. Please consult the Power Company websites for the most recent version. © 2022 PacifiCorp..

1. Customer shall provide a drawing of the proposed service equipment, including EUSERC reference numbers and a mounting pad with dimensions, to the Power Company for review and approval. Power Company approval must be obtained prior to fabrication.

2. The customer shall provide and install:

3. The metering CTs shall be located in the CT compartment.

4. The CT compartment shall have a hinged door.

5. For a single service, the meter and test switch shall be mounted remotely (outside the cabinet).

6. Installing two or more metering services requires mounting on the compartments’ hinged meter panels.

7. The metering conduit in the switchboard section shall terminate in the CT compartment in front of the CTs.

8. The door shall be equipped with a device to hold it in the open position at 90° or more.

9. Lugs for terminating the customer’s ground wire (or other grounding conductors) shall be located outside the sealable section and shall be designed to allow the customer’s neutral system to be readily accessible.

10. All pull and termination sections shall have full front access.

11. All removable cover panels shall have two lifting handles, and be limited to a maximum weight of 25 pounds.

12. The Power Company will terminate the line side service conductors using Power Com-pany-provided connectors on lug landings in the pull section.

13. Bus bars are required from the pull section for service above 800 amps. Termination lugs are required and shall meet EUSERC 347.

14. Any customer-owned locking equipment for the metering enclosure must allow independent access by the Power Company.

15. Only Power Company conductors are allowed inside the pull section.

a. switchboard enclosure with CT compartment

b. meter socket

c. metering conduit–1-inch minimum electrical non-metallic tubing (ENT) or flexible PVC for the metering secondary conductors; consult the Power Company for placement

d. locking equipment for the meter enclosure

e. concrete mounting pad for the switchboard enclosure. Refer to Section 9.1

9.5.2 Service for Switchboard Enclosures

Table 29—MinimumDimensions for Switchboard Pull Boxes

(Termination Enclosures) T a b le 2 4

Switchboard Rating Minimum Access Opening (W) Termination Height (X) 3-wire 4-wire min. max.

Below 400 A Consult the Power Company 400-800 A 24” 24”

42” 72”

801-1200 A 24” 30” 1201-2000 A 30” 35” 2001-3000 A — 42”

60” 3001-4000 A — 44”

2022 Electric Service Requirements Section 9

This manual shall be distributed and interpreted in its entirety. Individual pages will not represent all the requirements necessary for an installation.

Figure 60—Switchboard with Remote Meter Socket

EUSERC 325, 326, 339, and 345

9.5.1 Switchboard with Remote Meter Socket

9.5.2.1 Switchboard Metering, 2000 AMaximum

Figure 61—Installation for Combination Switchboard Sections with a Termination

Enclosure, EUSERC 327, 345

F ig u re 5 3

98 This manual shall be distributed and interpreted in its entirety. Individual pages will not represent all the requirements necessary for an installation. Printed ver-sions of this document may be out of date. Please consult the Power Company websites for the most recent version. © 2022 PacifiCorp..

Figure 62—Overhead Service Termination, Switchboard Service Section, EUSERC 348

F ig u re 5 4

9.5.2.2 Switchboard Metering, 4000 AMaximum

Figure 63—Typical Installation for Switchboard Metering, EUSERC 345

F ig u re 5 5

2022 Electric Service Requirements Section 9

This manual shall be distributed and interpreted in its entirety. Individual pages will not represent all the requirements necessary for an installation.

Service Type Rated Current EUSERC Drawing Single-phase, three wire 0 to 800 A 319

Three-phase, three/four-wire 0 to 1000 A 320 Three-phase, four-wire 1001 to 3000 A 322 Three-phase, four-wire 3001 to 4000 A 324

Figure 64—CT Metering for Switchboards

0-800 A, Single-Phase, Three-Wire, EUSERC 319 F ig u re 5 6

100 This manual shall be distributed and interpreted in its entirety. Individual pages will not represent all the requirements necessary for an installation. Printed ver-sions of this document may be out of date. Please consult the Power Company websites for the most recent version. © 2022 PacifiCorp..

9.5.3 CT Compartment for Switchboards

A CT compartment is required for all switchboard enclosures.

Table 30—Switchboard CT Compartment Summary F ig u re 6

Figure 65—CT Metering for Switchboards

0-1000 A, Three-Phase, Three- and Four-Wire, EUSERC 320

F ig u re 5 7

2022 Electric Service Requirements Section 9

This manual shall be distributed and interpreted in its entirety. Individual pages will not represent all the requirements necessary for an installation.

Figure 66—CT Metering for Switchboards

1001-3000 A, Three-Phase, Four-Wire Service, EUSERC 322

F ig u re 5 8

102 This manual shall be distributed and interpreted in its entirety. Individual pages will not represent all the requirements necessary for an installation. Printed ver-sions of this document may be out of date. Please consult the Power Company websites for the most recent version. © 2022 PacifiCorp..

Figure 67—CT Compartment for Switchboards

3001 to 4000 A, Three-Phase, Four-Wire Service, EUSERC 324

F ig u re 5 9

2022 Electric Service Requirements Section 9

This manual shall be distributed and interpreted in its entirety. Individual pages will not represent all the requirements necessary for an installation.

File details come from the government source that posted it. Updated Feb 20, 2024.