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Table of Contents
                            27 kV Metal-Enclosed Interrupter (MEI) Switchgear
Table of Contents
	1. Foreword 2
	2. Ratings 3
	3. Construction 3
	4. Basic Components 7
	5. Protection and Control 9
	6. Alternative Construction 10
	7. Special Tools 10
	8. Testing and Certification 10
	09. Design Review 10
	10. Test Witnessing 11
	11. Documentation 11
	12. Training 12
	13. Warranty 12
	14. Shipping 12
	15. Approved Manufacturers 12
	Appendices
	A. Site-Specific Requirements Development Worksheet 13
	B. Bidder’s Data Sheet 15
	C. Bidder Supplied Documents, Drawings, and Lists 18
	D. Drawing and Documentation List 19
	E. Seattle City Light Metering Compartment Requirements 20
	F. Recommended Protection and Control Schemes 22
27 kV Metal-Enclosed Interrupter (MEI) Switchgear
1. Foreword
	1.1  Scope
	1.2  Standards
	1.3  Conflict
2.  Ratings
	2.1  Basic Electrical
	2.2  Temperature Limitations
3.  Construction
	3.1  General
	3.2  Arc Resistance
	3.3  General Compartment Requirements
	3.4  Cable Termination Compartment Requirements
	3.4  Cable Termination Compartment Requirements, continued
	3.5  Nameplates
	3.6  Materials
	3.7  Coating System Qualification
	3.8  Finish
	3.9  Physical Access Control
	3.10  Enclosure Category
	3.11  Ventilation
	3.12  Humidity Control
	3.13  Convenience Outlets
	3.14  Storage
	3.15  Seismic Withstand Capability
4.  Basic Components
	4.1  Load Interrupter Switches
	4.2  Load Interrupter Switch Operators
	4.3  Power Fuse Mountings
	4.4  Power Fuses
	4.5  Insulators
	4.6  Bus and Connections
	4.6  Bus and Connections, continued
	4.7  Surge Arresters
	4.8  Instrument Transformers
	4.9  Auxiliary Power Transformer
	4.9  Auxiliary Power Transformer, continued
5.  Protection and Control
	5.1  Protection and Control
	5.2  Source Transfer
	5.3  Open-Phase Detector
	5.4  Pendant Switch Controller
	5.5  SCADA
6.  Alternative Construction
7.  Special Tools
8.  Testing and Certification
	8.1  Quality Assurance
	8.2  Design Tests
	8.3  Production Tests
	8.4  Conformance Tests
	8.5  Field Dielectric Tests
9.  Design Review
10. Test Witnessing
11.  Documentation
	11.1  General
	11.2  Bidder’s Information
	11.3  Approval Drawings
	11.4  Final Certified Drawings and Instruction Books
12.  Training
	12.1  Operations and Maintenance
	12.2  Engineering
13.  Warranty
14.  Shipping
15. Approved Manufacturers
A.1  Scope
A.2  General
A.3  One Line Diagram
A.4  Requirements (Text-Based)
A.5  Shipping
A.6  Assembling the Bid Package
C.1 Catalog literature
C.2 Proposed switchgear assembly one line diagram
C.3 Representative switchgear outline drawing showing:
C.4 Clear indication if pit is required (and how deep) to obtain minimum clearances cited in Section 3.4 - Cable Termination Compartment Requirements.
C.5 Representative wiring and schematic diagrams
C.6 Ratings, technical summaries, make, and model of basic components, including, but not limited to:
C.7 Representative bus connection (including bill of material)
C.8 Design test data for the complete metal-enclosed interrupter (MEI) switchgear assembly as cited in IEEE C37.20.3, Section 6.2.
C.9 Design test data for the load interrupter switches as cited in IEEE C37.20.4, Section 6.2.
C.10 Seismic capability conformance documentation. This may be the product of physical testing or finite element analysis (FEA) software.
C.11 Proof of QA/QC certification(s)
C.12 Summary of factory QA/QC program
C.13 Representative shipping, rigging, and off-loading delivery vehicle information
C.14 Representative installation, operation, and maintenance manual(s)
C.15 Summary descriptions (including estimated labor hours and material cost) for the preventive maintenance tasks the manufacturer recommends be performed during the first ten years of service.
C.16 Warranty
C.17 Extended warranty, if any
C.18 List at least five projects completed within the last three years to supply 15 kV to 38 kV metal-enclosed (MEI) switchgear. List shall include:
For Approval
D.1 Switchgear assembly one line diagram
D.2 Switchgear outline drawing, showing:
D.3 Three line wiring, schematic, and logic diagrams
D.4 Ratings and technical summaries of basic components, including, but not limited to:
D.5 Nameplate drawings
D.6 Design test data for the complete metal-enclosed interrupter (MEI) switchgear assembly as cited in IEEE C37.20.3, Section 6.2.
D.7 Design test data for the load interrupter switches as cited in IEEE C37.20.4, Section 6.2.
D.8 Current transformer ratio correction factor, phase angle, and excitation curves (typical)
D.9 Step and touch potential analysis
D.10 Seismic capability conformance documentation
D.11 Installation, operation, and maintenance manual(s)
D.12 Rigging diagrams for lifting and unloading switchgear
D.13 Spare parts list including:
D.14 Special tools required to operated, maintain, inspect, and test switchgear list
D.15 Standard warranty
D.16 Extended warranty, if any
	Final
D.17 All of the items listed above (approved versions), plus
D.18 Certified (production) test reports
E.1  Scope
E.2  Basic Requirements
E.3  Seattle City Light Requirements
E.3  Seattle City Light Requirements, continued
E.4  Approval
F.1  Scope
F.2  Recommended Schemes
	F.2.1  Incoming Cubical - Radial Feed System
	F.2.2  Incoming Cubical - Dual Feed System without Tie Switch
	F.2.3  Incoming Cubical - Dual Feed System with Tie Switch
	F.2.4  Feeder Cubical - Small Transformer (less than 3 MVA)
	F.2.5  Feeder Cubical – Large Transformer (3 MVA and greater)
F.3  Approval
                        
Document Text Contents
Page 1

SEATTLE CITY LIGHT

MATERIAL STANDARD
STANDARD NUMBER:

PAGE:
SUPERSEDING:

EFFECTIVE DATE:

4505.85
1 of 23
December 22, 2005
October 29, 2015



Standards Coordinator
Laura Vanderpool

Standards Supervisor
John Shipek

Unit Director
Darnell Cola








27 kV Metal-Enclosed Interrupter (MEI) Switchgear
Table of Contents

1. Foreword ......................................................................... 2
1.1 Scope .................................................................... 2
1.2 Standards .............................................................. 2
1.3 Conflict .................................................................. 3

2. Ratings ............................................................................ 3
2.1 Basic Electrical ...................................................... 3
2.2 Temperature Limitations ........................................ 3

3. Construction ................................................................... 3
3.1 General ................................................................. 3
3.2 Arc Resistance ...................................................... 4
3.3 General Compartment Requirements .................... 4
3.4 Cable Termination Compartment

Requirements ....................................................... 4
3.5 Nameplate ............................................................. 5
3.6 Materials ............................................................... 5
3.7 Coating System Qualification ................................ 5
3.8 Finish .................................................................... 5
3.9 Physical Access Control ........................................ 6
3.10 Enclosure Category .............................................. 6
3.11 Ventilation ............................................................. 6
3.12 Humidity Control ................................................... 6
3.13 Convenience Outlets ............................................. 6
3.14 Storage ................................................................. 6
3.15 Seismic Withstand Capability ................................ 6

4. Basic Components ......................................................... 7
4.1 Load Interrupter Switches...................................... 7
4.2 Load Interrupter Switch Operators ........................ 7
4.3 Power Fuse Mountings .......................................... 7
4.4 Power Fuses ......................................................... 7
4.5 Insulators .............................................................. 7
4.6 Bus and Connections ............................................ 7
4.7 Surge Arresters ..................................................... 8
4.8 Instrument Transformers ....................................... 8
4.9 Auxiliary Power Transformer ................................ 8

5. Protection and Control ................................................... 9
5.1 Protection and Control ........................................... 9
5.2 Source Transfer .................................................... 9
5.3 Open-Phase Detector ............................................ 9
5.4 Pendant Switch Controller ..................................... 9
5.5 SCADA .................................................................. 9

6. Alternative Construction .............................................. 10
7. Special Tools ................................................................ 10
8. Testing and Certification .............................................. 10

8.1 Quality Assurance ............................................... 10
8.2 Design Tests ....................................................... 10
8.3 Production Tests ................................................. 10
8.4 Conformance Tests ............................................. 10
8.5 Field Dielectric Tests ........................................... 10

09. Design Review .............................................................. 10
10. Test Witnessing ............................................................ 11
11. Documentation ............................................................. 11

11.1 General ............................................................... 11
11.2 Bidder’s Information ............................................ 11
11.3 Approval Drawings .............................................. 11
11.4 Final Certified Drawings and Instruction Books ... 12

12. Training ......................................................................... 12
12.1 Operations and Maintenance............................... 12
12.2 Engineering ......................................................... 12

13. Warranty ........................................................................ 12
14. Shipping ........................................................................ 12
15. Approved Manufacturers ............................................. 12






Appendices

A. Site-Specific Requirements Development Worksheet 13
A.1 Scope .................................................................. 13
A.2 General ............................................................... 13
A.3 One Line Diagram ............................................... 13
A.4 Requirements (Text-Based) ................................ 14
A.5 Shipping .............................................................. 14
A.6 Assembling the Bid Package ............................... 14

B. Bidder’s Data Sheet ...................................................... 15
C. Bidder Supplied Documents, Drawings, and Lists .... 18
D. Drawing and Documentation List ................................ 19

For Approval ................................................................... 19
Final ............................................................................... 19

E. Seattle City Light Metering Compartment Requirements 20
E.1 Scope .................................................................. 20
E.2 Basic Requirements ............................................ 20
E.3 Seattle City Light Requirements .......................... 20
E.4 Approval .............................................................. 21

F. Recommended Protection and Control Schemes ...... 22
F.1 Scope .................................................................. 22
F.2 Recommend Schemes ........................................ 22

F.2.1 Incoming Cubical - Radial Feed System .. 22
F.2.2 Incoming Cubical - Dual Feed System

without Tie Switch .................................... 22
F.2.3 Incoming Cubical - Dual Feed System with

Tie Switch ................................................ 23
F.2.4 Feeder Cubical - Small Transformer ........ 23
F.2.5 Feeder Cubical – Large Transformer ....... 23

F.3 Approval .............................................................. 23

Page 2

SEATTLE CITY LIGHT

MATERIAL STANDARD
27 kV Metal-Enclosed Interrupter (MEI) Switchgear

STANDARD NUMBER:

PAGE:
SUPERSEDING:

EFFECTIVE DATE:

4505.85
2 of 23
December 22, 2005
October 29, 2015



27 kV Metal-Enclosed Interrupter (MEI) Switchgear


1. Foreword

1.1 Scope

This standard covers general requirements for 27 kV metal-enclosed interrupter (MEI) switchgear assemblies
containing, but not limited to, such devices as interrupter switches; selector switches; power fuses; control,
instrumentation and metering devices; and protective equipment for the control and protection of apparatus used for
distribution of electrical power.

This standard is applicable only to metal-enclosed interrupter (MEI) switchgear ultimately owned by Seattle City
Light.

Metal-enclosed interrupter (MEI) switchgear is intended for use on a 26.4 kV, three-phase, 60 Hz, 4-wire, solidly
grounded, isolated neutral distribution system.

In addition to addressing the purely technical aspects of metal-enclosed (MEI) switchgear, this material standard
may also be used by the Purchaser as a guide to:
 Develop site-specific requirements
 Assemble bid packages
 Aggregate bid information

Detailed, site-specific requirements shall be according to:
 Site-Specific One Line Diagram
 Site-Specific Requirements (text-based)

Purchaser is directed to Appendix A for information related to developing site-specific requirements.

This standard is not applicable to switchgear assemblies containing power circuit breakers, also known as metal-
clad switchgear.



1.2 Standards

Metal-enclosed interrupter (MEI) switchgear assembly and components shall meet the requirements of the following
standards and codes:

 6801.4 - City Light Material Standard, 21 kV Heavy Duty Distribution Class Metal-Oxide Surge Arrester, dated
October 18, 2004

 C37.20.3-2001 - IEEE Standard for Metal-Enclosed Interrupter Switchgear
 C37.20.4-2001 – IEEE Standard for Indoor AC Switches (1kV-38kV) for Use in Metal-Enclosed Switchgear
 C37.40-2003 – IEEE Standard Service Conditions and Definitions for High-Voltage Fuses, Distribution Enclosed

Single-Pole Air Switches, Fuse Disconnecting Switches, and Accessories

 ANSI C37.22-1997 – Preferred Ratings and Related Required Capabilities for Indoor AC Medium-Voltage
Switches Used in Metal-Enclosed Switchgear

 C57.12.28-1999 – ANSI Pad-Mounted Equipment-Enclosure Integrity
 C2-2002 – National Electric Safety Code (NESC)
 NEMA 250-2003 – Enclosures for Electrical Equipment (1000 Volts Maximum)
 Revised Code of Washington (RCW) 19.29.010
 Q9001-2000 – ANSI/ISO/ASQ Quality Management Systems: Requirements

Page 11

SEATTLE CITY LIGHT

MATERIAL STANDARD
27 kV Metal-Enclosed Interrupter (MEI) Switchgear

STANDARD NUMBER:

PAGE:
SUPERSEDING:

EFFECTIVE DATE:

4505.85
11 of 23
December 22, 2005
October 29, 2015



10. Test Witnessing

Seattle City Light reserves the right to have a representative(s) present and observe production tests and/or inspect the
metal-enclosed (MEI) switchgear prior to shipment. Photocopies of preliminary test results shall be supplied to Seattle City
Light representative(s) witnessing the tests, upon request. Supplier shall provide Seattle City Light at least fourteen (14)
days written notice prior to testing to allow Seattle City Light’s representatives to be present at tests.



11. Documentat ion

11.1 General

All documentation shall be in English and use customary inch-pound units.

11.2 Bidder’s Information

Bidder shall furnish two (2) sets of the following information to Seattle City Light’s Purchasing Department:
 Completed Appendix B – Bidder’s Data Sheet
 The documents and drawings listed in Appendix C – Bidder Supplied Documents, Drawings, and Lists

Bid drawings and documents shall be marked with Seattle City Light’s Request for Proposal (RFP) number.

11.3 Approval Drawings

Successful bidder/supplier shall furnish three (3) sets of the approval drawings and documents listed in Appendix D
– Drawing and Documentation List (approval and final) to Seattle City Light’s Purchasing Department.

Supplier’s schedule shall include transmittal time and the twenty (20) working days Seattle City Light will require to
conduct its review.

All approval drawings shall be endorsed for approval and be marked with Seattle City Light’s purchase order
number and supplier’s shop order number.

Seattle City Light will review each drawing and document and return one (1) copy of each to the supplier together
with a transmittal letter summarizing Seattle City Light’s comments.

The transmittal letter will indicate the approval status of each drawing and document reviewed by Seattle City Light.
Approval status categories are as follows:

ACCEPTED – WITHOUT COMMENT - Item is approved by SCL as to general scope and content; however,
the supplier is not relieved of their obligation to meet all of the requirements of the Material Standard.

ACCEPTED – WITH COMMENTS NOTED - Item is approved by SCL as to general scope and content
subject to the minor changes noted on the item; however, the supplier is not relieved of their obligation to
meet all of the requirements of the Material Standard.

NOT ACCEPTED - REVISE AND RESUBMIT - Item is not approved by SCL. Supplier shall specifically
address and/or incorporate all SCL comments into a revised submittal, and resubmit the item to SCL for
approval.

Seattle City Light will review all revised and resubmitted drawings and documents and return one (1) copy of each,
together with a transmittal letter, to the supplier within (10) working days after receipt. Drawings and documents
shall bear a revised revision date. Revised areas of the submittal shall be circled.

Supplier shall present a complete and acceptable submittal package to Seattle City Light not later than the second
submittal of an item.

Seattle City Light reserves the right to withhold monies due the supplier to cover the unplanned cost of review
beyond the second submittal.

Corrections indicated on submittals returned by Seattle City Light shall be considered as changes necessary to
meet the requirements of this material standard and shall not be taken as the basis for claims for extra work.

Page 12

SEATTLE CITY LIGHT

MATERIAL STANDARD
27 kV Metal-Enclosed Interrupter (MEI) Switchgear

STANDARD NUMBER:

PAGE:
SUPERSEDING:

EFFECTIVE DATE:

4505.85
12 of 23
December 22, 2005
October 29, 2015



11.4 Final Cert i f ied Drawings and Instruct ion Books

After approval of all submittals by Seattle City Light, supplier shall furnish four (4) sets of the final, certified
drawings, instruction books, spare parts list, and test reports listed in Appendix D – Drawing and Documentation
List (approval and final) to Seattle City Light’s Purchasing Department.

All final, certified drawings (etc.) shall be endorsed correct for construction and be marked with Seattle City Light’s
purchase order number and supplier’s shop order number.

In addition to the above four (4) sets, one (1) set of drawings, instruction books, spare parts list, and test reports
shall be shipped with one of the switchgear bays, suitably protected from shipping damage and weather.

12. Training

12.1 Operat ions and Maintenance

Supplier shall provide two days of training, eight (8) hours each day, for up to 25 personnel covering the installation,
operation, maintenance, troubleshooting and repair of the switchgear.

Supplier shall provide training within one (1) month of receipt of switchgear by Seattle City Light.

Supplier shall provide as course material certified drawings, instruction books, spare parts list, and test reports.

Supplier shall submit proposed course outline to Seattle City Light’s Purchasing Department for review, comment,
and approval four (4) weeks prior to shipping completed switchgear.

12.2 Engineering

Supplier shall provide one day of training, eight (8) hours each day, for up to 25 personnel covering the installation,
operation, maintenance, troubleshooting and repair of the switchgear.

Engineering training will precede Operations and Maintenance training.

Supplier shall provide as course material certified drawings, instruction books, spare parts list, and test reports.

Supplier shall submit proposed course outline to Seattle City Light’s Purchasing Department for review, comment
and approval no later than two (2) months prior to shipping completed switchgear.

13. Warranty

Warranty general terms and conditions for metal-enclosed (MEI) switchgear shall be as specified in Seattle City Light’s
purchase order.

Warranty period for metal-enclosed (MEI) switchgear shall be a minimum of twelve (12) months from date of energization,
or eighteen (18) months from date of receipt, whichever is earlier, or as stated on Seattle City Light’s Request for Proposal
or Purchase Order.

14. Shipping

Freight terms shall be FOB destination, freight prepaid and allowed, or as stated on Seattle City Light’s Request for
Proposal or Purchase Order.

Shipping destination shall be as specified on the site-specific requirements document or Seattle City Light’s Request for
Proposal or Purchase Order.

Exterior and interior of switchgear shall be received reasonably free from road dust, dirt, and other contamination. If it is
necessary for Seattle City Light personnel to clean the switchgear, the supplier will be billed for their time.

Seattle City Light personnel will be responsible for rigging and off-loading metal-enclosed switchgear bay assemblies from
delivery vehicles.

15. Approved Manufacturers
 Federal Pacific
 Powercon Corporation
 S&C Electric Company

As of October 2015, this standard has been renumbered from 2501.85 to 4505.85.

Page 22

SEATTLE CITY LIGHT

MATERIAL STANDARD
27 kV Metal-Enclosed Interrupter (MEI) Switchgear

STANDARD NUMBER:

PAGE:
SUPERSEDING:

EFFECTIVE DATE:

4505.85
22 of 23
December 22, 2005
October 29, 2015



APPENDIX F – RECOMMENDED PROTECTION AND CONTROL SCHEMES







F.1 Scope

The information presented in this appendix was created to facilitate the development of site-specific, 27 kV metal-enclosed
interrupter (MEI) switchgear protection and control requirements.

The Purchaser or assigned design engineer is encouraged to contact the System Protection Protection Group for counsel
and advice at the earliest stage of the project.

F.2 Recommended Schemes

Below are the recommended schemes for five common engineering situations that may be found at Seattle City Light:





F.2.1 Incoming Cubical - Radial Feed System





Comments - Overcurrent Protection: Max
Size 175E, (S&C Standard Speed). Fuse
may not be required at the discretion of
SCL distribution design engineer. Fuse
must coordinate with upstream protection
device.











F.2.2 Incoming Cubical - Dual Feed System without Tie Switch







Comments - Overcurrent Protection: Max Size 175E,
(S&C Standard Speed). Automatic Transfer Switch.
Fuse may not be required at the discretion of SCL
distribution design engineer. Fuse must coordinate with
upstream protection device. Automatic Transfer option
shown. Manual Switching at the discretion of SCL
distribution design engineer.

Page 23

SEATTLE CITY LIGHT

MATERIAL STANDARD
27 kV Metal-Enclosed Interrupter (MEI) Switchgear

STANDARD NUMBER:

PAGE:
SUPERSEDING:

EFFECTIVE DATE:

4505.85
23 of 23
December 22, 2005
October 29, 2015




F.2.3 Incoming Cubical - Dual Feed System with Tie Switch





Comments - Overcurrent Protection: Max Size 175E,
(S&C Standard Speed). Automatic Transfer Switch.
Fuse may not be required at the discretion of SCL
distribution design engineer. Fuse must coordinate with
upstream protection device. Automatic Transfer option
shown. Manual Switching at the discretion of SCL
distribution design engineer.









F.2.4 Feeder Cubical - Small Transformer (less than 3 MVA)



Comments - Overcurrent Protection: Max Size
65X - Cooper, (full range current limiting fuse).
Fuse must coordinate with upstream protection
device.











F.2.5 Feeder Cubical – Large Transformer (3 MVA and greater)



Comments - Overcurrent Protection: Relay,
with Phase and Ground Elements; must
coordinate with upstream protective devices.
Circuit Breaker. The switchgear required for
this scheme is outside the scope of this
material standard.













F.3 Approval

All protection and control schemes for 27 kV metal-enclosed interrupter (MEI) switchgear assemblies shall be reviewed
and approved by the System Protection Group.

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