Massachusetts Department Of Transportation Highway Division Proposal No. 612505-134592

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DOCUMENT A00804

NATIONAL GRID SPECIFICATIONS FOR

ELECTRICAL INSTALLATIONS

Massachusetts Department Of Transportation Highway Division

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Specifications for Electrical Installations

Covering National Grid’s Service Areas in Massachusetts (MA) and New York (NY)

Electric System Bulletin No. 750

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Also, visit https://www.nationalgridus.com for this and other National Grid information.

Our assistance is just a phone call away!

Help is as close as your phone. Call our local National Grid office for useful information and assistance whenever you have questions on information in this booklet.

While you’re planning electrical and mechanical systems for your next project, our representatives will work closely with you and your clients.

We’ll provide detailed analysis or supplemental data on all types of electrical installations.

We’ll give you valuable aid before final plans are made on heating, cooling, wiring and lighting. And most important, we will suggest ways to conserve energy.

A call to National Grid will help you help yourself. Call today!

We’re available 24 hours a day, every day!

Customer Service Center New York Massachusetts

Phone Number and Hours of Operation

1-800-642-4272 Mon-Fri 7:00 am – 7:00 pm After 7:00 pm & Wknds –

Emergency only

1-800-322-3223 Mon-Fri 7:00 am – 7:00 pm Saturday 7:00 am – 5:00 pm

Fax 1-315-460-9270 (for new service applications only) 1-508-357-4730

Mailing Address

National Grid Customer Service Center

300 Erie Boulevard W.

Syracuse, NY 13202-4250

National Grid Customer Service Center

PO Box 960 Northborough, MA 01532-0960

Non-English-Speaking Customers Para Clients que habian Espanol 1-800-561-6672 1-800-322-3223

Hearing/Speech-Impaired Customers 711

Specialized Commercial & Industrial Business Group

1-800-664-6729 Mon-Fri 8:00 am – 5:00 pm Not Applicable

Emergency Numbers – does not replace 911 emergency medical services

Life-Threatening Electric Emergency 1-800-892-2345

1-800-465-1212

Life-Threatening Gas Emergency 1-800-233-5325

Power Outages 1-800-867-5222 1-800-465-1212

Contractor Services For Order Initiation and Inspection Release

1-800-260-0054 1-315-350-3967 Fax https://gridforce.my.site.com/electric/s/ customerelectricconnectionsuny@nationalgrid.com Mon-Fri 7:30 am – 5:00 pm

By Phone 1-800-375-7405 Mon-Fri 8:00 am – 4:30 pm

View/Upgrade/Demo and Inspection Release Portal https://gridforce.my.site.com/electric/s/

By Fax 1-800-882-0322 Using Electric Service Request Form 1-888-266-8094

Online by Internet https://gridforce.my.site.com/electric/s/article/Electric-Specifications Customer Order Fulfillment 1-800-664-6729 or 1-800-260-0054 (for assistance with pending electric service requests)

For Electric Inspectors, to release a municipal wiring inspection

1-800-375-7405 NE Only; 1-800-664-6729 NY Mon-Fri 8:00 am – 4:30pm

24-hour automated system. *For single service requests only.

New Residential or Commercial Developments customerelectricconnectionsuny@nationalgrid.com (To e-mail AutoCAD or MicroStation drawings – NY Only) workrequest@nationalgrid.com

(MA)

Dig Safe Requests 1-800-962-7692 or 811

Dig Safely NY 1-888-DIGSAFE (1-888-344-7233) or 811

Dig Safe System Inc.

811 is the nationwide number; see http://call811.com/Default.aspx

Hazard Identification Hotline When working near power lines or high voltage lines

1-800-642-4272 1-888-625-3723

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Specifications for Electrical Installations

Covering National Grid’s Service Areas in Massachusetts (MA) and New York (NY)

Electric System Bulletin (ESB) 750

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National Grid / Specification for Electrical Installations / ESB 750 - 2025

For the latest authorized version, please refer to the Company’s website at https://gridforce.my.site.com/electric/s/article/Electric-Specifications

PREFACE

These 2025 specifications consolidate and replace the “Specification for Electrical Installation 2024, and are in effect for the following National Grid companies:

• Massachusetts Electric Company

• Nantucket Electric Company

• Niagara Mohawk Power Corporation

These specifications, which protect the mutual interests of the Customer and Company, may be revised or amended from time to time in keeping with developments and progress of the industry. For the latest official version of this document please visit the Company’s web site address at:

https://gridforce.my.site.com/electric/s/article/Electric-Specifications.

Printed copies of these specifications are not document controlled and may be obtained from the Company by contacting the applicable Company representative. Therefore, the online version will always prevail over any uncontrolled printed documents. The 2025 version incorporates the ESB 750 Series Errata and Revisions issued in January 2024.

Where referenced in tariffs by the National Grid companies, this new edition is synonymous with the designations as “ESB 750 Book” or “Information and Requirements Book” and meets the same requirements.

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TABLE OF CONTENTS

PREFACE

PROCESS AND INFORMATION

SAFETY INFORMATION

PART A – GENERAL INFORMATION

1.0 INTRODUCTION

1.1 Purpose

1.2 Scope

1.3 Rate Schedule

1.4 Cooperation and Time Requirements

1.5 Codes, Standards, and References

1.5.1 References

1.5.2 Supplemental Company Specifications

1.6 Requests for Information

1.7 Customer’s Responsibility

1.7.1 All Customers

1.7.2 Customers Served at Voltages Above 600V

1.8 Company’s Responsibilities

1.9 Inspection, Wiring Adequacy, And Enforcement

1.10 Disclaimer

1.10.1 Company Approval

1.10.2 Use of Electricity

1.10.3 Condition of Service

1.10.4 Company Warranty Statement

1.11 Enforcement of Company Requirements

1.11.1 Enforcement Criteria

1.11.2 Diversion of Electrical Energy

1.11.3 Unauthorized Attachment

2.0 DEFINITIONS

3.0 GENERAL SERVICE CONNECTION REQUIREMENTS

3.1 Application for Service

3.1.1 Application

3.1.2 Public Grants and Special Permits

3.1.3 Easements

3.1.4 One-Line Requirements

3.2 Number of Services

3.2.1 With Respect to Building and Premise

3.2.2 Electricity Delivered Through More Than One Meter

3.2.3 Multiple Service Requests

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3.3 Temporary Service

3.3.1 Company Facilities

3.3.2 Location

3.3.3 Equipment

3.3.4 Duration

3.3.5 Cost

3.4 Access

3.5 Identification of Employees

3.6 Character of Service

3.7 Voltages Available

3.7.1 Available Services

3.7.2 New Customers (Applicants)

3.7.3 Existing Customers

3.8 Services No Longer Standard

3.9 Load Balance

3.10 Increase in Service

3.11 Service Entrance Upgrade

3.12 Discontinuance of Service

3.13 Energy Management System

3.14 Electric Vehicle Charging

PART B – ELECTRIC SERVICE REQUIREMENTS

4.0 SERVICE CONNECTIONS

4.1 General

4.1.1 Rights-of-Way, Easements

4.1.2 Number, Routing and Location of Service Laterals or Service Lines

4.1.3 Relocation of Services

4.1.4 Voltage Drop Considerations

4.1.5 Minimum Size Single-Phase Service Connections

4.1.6 Service Conductor Splicing

4.1.7 Routing of Metered and Unmetered Conductors Within a Building

4.1.8 Temporary Service

4.1.9 Service to Manufactured and Mobile Homes, Mobile Home Parks, and Recreational Vehicle Parks 30

4.2 Overhead Secondary Voltage Service Connection (Under 600V)

4.2.1 General

4.2.2 Service Attachment, Location

4.2.3 Customer-Owned Service Pole

4.2.4 Overhead Service Line Clearances

4.2.5 Service Drop and Connection to Service Conductors

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4.2.6 Residential Overhead Service Upgrade

4.3 Overhead Primary Voltage Service Connection (2.4kV to 46kV inclusive)

4.4 Overhead Transmission Voltage Service Connection

4.5 Underground Secondary Service Voltage Connection (Under 600V)

4.5.1 General

4.5.2 Facilities in Shared Trench

4.5.3 Conduit System

4.5.4 Underground Secondary Service Connection from the Company’s Overhead Distribution Supply Line

4.5.5 Underground Secondary Service Connection from the Company’s Underground Supply Lines 38

4.5.6 Underground Residential Distribution (URD) Areas

4.5.7 Underground Secondary Service Connection

4.6 Underground Primary Voltage Service Connection (from 2.4kV to 46kV inclusive)

4.7 Underground Transmission Voltage Service Connection

4.8 Access Roads

4.9 Labeling Specification

5.0 SERVICE EQUIPMENT

5.1 General

5.1.1 Service Equipment Required

5.1.2 Service Equipment Minimum Continuous Current Rating

5.1.3 Service Equipment Minimum Short Circuit Withstand Capability

5.1.4 Routing of Metered and Unmetered Conductors

5.1.5 Taps Ahead of Main Service Equipment

5.1.6 When Service Equipment Ahead of Metering is Required (Cold Sequence)

5.1.7 Service Equipment on Service Poles, Pedestals, or Posts

5.1.8 Service Equipment Arrangement

5.1.9 Service Equipment Minimum Attributes

5.1.10 Instrumentation and Control Wiring

5.2 Residential

5.3 Network Service

5.3.1 General

5.4 Multiple Occupancy Building Service

5.5 Service Equipment Above 600V

6.0 GROUNDING

6.1 General

6.2 Equipment to Be Grounded or Bonded

6.3 Grounding and Bonding Methods

6.4 Grounding Restrictions

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6.5 Ground Fault Protection

7.0 METERING

7.1 General

7.1.1 Meter Location and Access for New or Upgraded Services

7.1.2 Working Clearances

7.1.3 Physical Protection

7.1.4 Violations

7.1.5 Security of Unmetered Wiring

7.1.6 Taps Ahead of Metering

7.1.7 Group Metering

7.1.8 Shared Metering (for NY only)

7.2 Meter Applications and Requirements 600V and Less

7.3 Self-Contained Meter Socket Installations

7.4 Transformer-Rated Metering 600 V and Less, 400 A and Above

7.4.1 Instrument Transformers and Enclosures

7.4.2 Meter Socket Enclosure

7.4.3 Sequence for Transformer-Rated Metering

7.4.4 Instrument Transformer Secondaries

7.4.5 Pad-mounted Transformer Service Metering

7.4.6 Metal-Enclosed Free-Standing Service Cubicles Rated 600 V or Less (Secondary Voltage Installations)

7.5 Metering Above 600 V

7.6 Metering Pulse Signals

7.7 Meter Boards and Supports

7.7.1 Meter Mounting

7.7.2 Meter Mounted on the Exterior of a Building

7.7.3 Meter Mounted on a Free-Standing Support

7.7.4 Meter Installed Interior to a Building

8.0 MOTORS

8.1 General

8.2 Single-Phase Motors

8.2.1 Single-Phase Motor Limitations

8.2.2 Maximum Locked-Rotor Currents

8.2.3 Single-Phase Motors on Three-Phase Service

8.3 Three-Phase Motors

8.3.1 Size of Motors

8.3.2 Maximum Locked-Rotor Currents

8.3.3 Maximum Permitted Starting Current

8.4 Motor Protection

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8.4.1 Overload Protection

8.4.2 Protection Against Single-Phase Operation

8.4.3 Reverse Phase Protection

8.4.4 Undervoltage Protection

8.5 Motor-Starting Requirements

8.5.1 Objectionable Voltage Variation

8.5.2 Current Inrush Limitation

8.5.3 Favorable Locations

8.5.4 Company Notification of 3 HP Single-Phase and 10 HP Three-Phase Applications

9.0 TRANSFORMER INSTALLATIONS ON CUSTOMER PREMISES

9.1 General

9.2 Installations

9.2.1 Overhead Transformers

9.2.2 Outdoor Single-Phase Pad Mounted Transformer

9.2.3 Outdoor Three-Phase Pad Mounted Transformer

9.2.4 Transformer Vault in Non-Network Area

9.2.5 Mat and Fence Substation

9.3 Available Fault Current

9.3.1 Network Services

9.3.2 Single-Phase Transformers

9.3.3 Three-Phase Overhead Transformers

9.3.4 Three-Phase Pad Mounted Transformers

10.0 DISTURBANCES AND POWER QUALITY

10.1 General

10.2 Motors

10.3 Devices with Intermittent High Current

10.4 Automatic Reclosing

10.5 Harmonic and Other Distortion

10.6 Power Supply to Voltage Sensitive Equipment Computers and Sensitive Equipment

10.7 Isolation Transformer

10.8 Electric Vehicle (EV) Chargers

11.0 CUSTOMER-OWNED ELECTRIC SOURCES – INCLUDING STANDBY GENERATORS

11.1 General

11.2 Emergency and Standby Electric Sources

11.2.1 Compliance Criteria

11.2.2 Electric Source Type & Installation Method

11.2.3 Transfer Systems

11.2.4 Identification and Clearances

11.3 Parallel Electric Power Production

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11.3.1 Inverters

12.0 UTILIZATION and SPECIAL EQUIPMENT

12.1 Electric Fences

12.2 Signs and Automatically Controlled Lighting

12.3 Lightning and Surge Protection

12.4 Power Factor Correction, Capacitors

12.4.1 Capacitor Installation

12.4.2 Static VAR Compensators (SVC)

12.5 Radio and Television

12.5.1 Transmitting Station, Repeater, or High Frequency Equipment

12.5.2 Antennas

12.5.3 Eliminator or Trap

12.6 Carrier Current Systems

13.0 REVISION HISTORY

14.0 FIGURES

Part C – APPENDICES

APPENDIX 1 - OVERHEAD ATTACHMENT METHODS

APPENDIX 2 - TRAFFIC CONTROL METERED SERVICE REQUIREMENTS

APPENDIX 3 - SWIMMING POOL CLEARANCE CRITERIA

APPENDIX 4 - ELECTRIC SERVICE AREAS

CHANGE PROPOSAL FOR NATIONAL GRID

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PROCESS AND INFORMATION

Obtaining Electric Service Please refer to the inside front cover of this book for Company contact information by phone, facsimile, mail, email, or internet.

Applicants requesting new electric service, existing customers requesting an upgrade or relocation of their electric service or new temporary service shall:

Contact the state-specific Customer Service Center and speak with a Service Representative.

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SAFETY INFORMATION

National Grid is committed to the pursuit of safety excellence through compliance with all OSHA. State, and Regulatory requirements. We encourage the Customer or its Contractor to comply with the same requirements and for safe trenching.

For worker safety precautions as applicable for the installation, please refer to:

• NESC ANSI C2;

• NFPA 70E;

• OSHA and

• any other state and local requirements.

811 is the nationwide number for utility locate requests before trenching, also:

http://www.call811.com

For Utility Locate Requests in New England States:

• Call 1-888-DIGSAFE (344-7233) or 811

• Submit Online: http://www.digsafe.com

For Utility Locate Requests in New York:

• Call 1-800-962-7962 or 811

• Submit Online:

https://udigny.org/

The Electrical Safety Foundation International (ESFI): http://www.esfi.org

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PART A – GENERAL INFORMATION

Note: The information provided in Part A contains common general conditions of electric service based upon state laws and regulations that govern the authority of utilities to provide electric service under applicable tariffs. While each utility's requirements may vary from state-to-state, most states have adopted some form of the National Electrical Safety Code (NESC). The NESC is an adoptable code promulgated by IEEE through the ANSI standards-making process.

1.0 INTRODUCTION

1.1 Purpose

The purpose of this document is to provide National Grid’s general electric service rules for basic requirements essential for maintaining satisfactory service or interconnection compatibility with National Grid’s electric power system (EPS). In addition, these rules are intended to properly protect the safety and interests of National Grid’s Customers and others served by the EPS operated by the utility. Where the term “Company” is used, it refers to the applicable serving utility within National Grid’s service territories. These basic rules are supplemented by the applicable tariffs in effect in each of the Company’s service territories; as such tariffs may be amended from time to time.

1.2 Scope

These electric service requirements cover conductors and equipment connecting the Company’s EPS at the Customer’s service point. These also include other topics associated with the supply of electricity that are of mutual interest to the Company, Customers, design professionals, and qualified installers. It should be noted that this is not intended to be a complete set of rules governing the electrical premises wiring and equipment.

1.3 Rate Schedule

Electric tariffs and associated rules and regulations are on file with the applicable state regulatory agencies and are also available for download from the Company’s website for each state. The following are the associated National Grid tariffs for these specifications, as such tariffs may be amended from time to time:

• In Massachusetts, “Terms and Conditions for Distribution Service”

• In New York, P.S.C. No. 220, “Schedule for Electric Service”

1.4 Cooperation and Time Requirements

The Customer, its authorized agent and/or design professional is responsible for cooperating with the Company and permitting a thorough and proper technical review by the Company for acceptance and timely delivery of the Company’s services. Preliminary information leading to new or increased electric service requirements shall be submitted to the Company early in the planning stages. This will ensure proper design and scheduling coordination of the work associated with the service connection.

1.5 Codes, Standards, and References

These rules supplement and may exceed standards of safety regarding the Customer’s electrical installation set forth in the National Electrical Code (NEC), the National Electrical Safety Code (NESC) and other applicable codes. These rules are not a substitute for the NEC, NESC, municipal codes, or any other authority having jurisdiction.

The Company requires that the Customer’s premises wiring installations be made in accordance with all applicable codes and these rules. Service shall be denied if these codes and the Company’s rules are not met. The Company accepts no liability for direct or indirect damages resulting from the Company’s refusal to energize a service or the Company’s termination of a service that does not meet these rules and all other applicable codes.

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Figure 1.5-1 is a general illustration of where the Company’s electric supply and the Customer’s premises wiring meet for what is covered and what is not covered by the NEC as described in NEC Section 90.2.

Local conditions of service may permit the Company’s metering to be installed at any point on either side of the service point; see 90.2(B)(5) in the NEC. Conditions of electric service are based on governmental laws or regulations that determine the Company’s authority to provide electric service under their tariffs.

These conditions of electric service affect the location of the service point and facilities under the Company’s exclusive control.

1.5.1 References

NFPA 70 National Electrical Code

NFPA 70B Recommended Practice for Electrical Equipment Maintenance

NFPA 70E Standard for Electrical Safety in the Workplace

ANSI/IEEE C2 National Electrical Safety Code

Building Code States of MA and NY

UL 2594 Electric Vehicle Supply Equipment

UL 2202 DC Charging Equipment for Electric Vehicles

UL 9741 Electric Vehicle Power Export Equipment

UL 1741

Inverters, Converters, Controllers and Interconnection System Equipment for Use with Distributed Energy Resources

Massachusetts General Laws:

Chapter 82, Section 40A Chapter 164, Section 127 & 127A Chapter 166, Sections 21A-21G Chapter 266, Section 30 Chapter 266, Section 127

New York State Laws:

Public Service Law, Chapter 48 of the Consolidated Laws High Voltage Proximity Act, contained in Labor Law, Chapter 31 of the Consolidated Laws, Section 202-h 16 NYCRR, Rules and Regulations of the Department of Public Service

Federal Occupational Safety and Health Administration (OSHA)

29 CFR 1926.550(a)(15) 29 CFR 1926.651 (b)(1)(2) 29 CFR 1910.333 (c)

Excavation Notification Requirements - Dig Safe

In MA: 1-888-DIGSAFE (344-7233) In NY: 1-800-962-7962 811 is the nationwide number; see https://call811.com/811-In-Your-State

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1.5.2 Supplemental Company Specifications

Note: ESB’s designated with an asterisk (*) are applicable only in New York

Specifications for Electrical Installations and Supplements Errata and Revisions

ESB No. 751* General Requirements Above 600V Service

ESB 751-NYPR* NY Protection Requirements

ESB No. 752* Service above 15,000V

ESB No. 753* Primary Meter Pole

ESB No. 755* Operation & Maintenance Requirements for Service Above 600V

ESB No. 756 General Requirements for Parallel Generation Connected to a National Grid Owned EPS

- Appendix A Connected to National Grid Facilities in New York, Massachusetts, New Hampshire, and Vermont Not Applicable to State Regulatory or Regional ISO Generator Interconnection Requirements

- Appendix B Requirements for DG Connected to National Grid’s Radial Distribution per the

NYS SIR

- Appendix C Requirements for Parallel Generation Connected to National Grid Facilities in Massachusetts

ESB No. 757 Network Services

ESB No. 758* Primary Service to Metal Enclosed Gear

ESB No. 759A Underground Residential Distribution (URD) Installation and Responsibility Guide

ESB No. 759B Underground Commercial Distribution (UCD) Installation and Responsibility Guide

See these Electric System Bulletins at:

https://gridforce.my.site.com/electric/s/article/Electric-Specifications.

1.6 Requests for Information

The Company invites inquiries and will assist the Customer with the application of these rules. Refer to the Process and Information section in the beginning of this book.

1.7 Customer’s Responsibility

1.7.1 All Customers

The Customer shall provide the service entrance, in accordance with the Company’s requirements, and all premises wiring on the load side of the service point. At all times, the Customer is responsible for ensuring that its electrical interconnection facilities attached to the Company’s EPS are designed, installed, operated, and maintained in accordance with all applicable codes, standards, rules, regulations, statutes, governmental ordinances, and third-party permits (collectively referred to as all applicable requirements). The Customer is responsible for contacting all third parties and obtaining all applicable permits (including environmental if required), approvals and inspections, and underground facility locating services for its premises wiring installation. Documentation substantiating the completion of such activities shall be furnished to the Company upon request.

The Customer shall assume or delegate, to an authorized representative, the primary responsibility for approval and acceptance of its equipment and the timing of its installation. The Company cannot accept any responsibility for the condition of the Customer's premises wiring and equipment. The Customer is

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1.7.2 Customers Served at Voltages Above 600V

1.7.2.1 Design Acceptance

The planning and design of electric service equipment at voltages above 600V requires skilled application of engineering principles and data to ensure proper interconnection and functionality with the utility electric supply system. Therefore, a Professional Engineer, licensed in the state where service is made, shall prepare all documents submitted to the Company in connection with all electric service equipment above 600V. (Reference ESB 751 for details.)

1.7.2.2 Operation and Maintenance

Customers owning electric service equipment above 600V shall operate and maintain such equipment in accordance with Company supplied operating instructions and specifically ESB 755, “Operation and Maintenance Requirements for Services above 600V.”

1.7.2.3 Company Device Operating Nomenclature

If applicable, National Grid will provide operating device numbers for customer service equipment. This equipment may be, but not limited to, switches, circuit breakers, primary fuses or secondary fuses. These device numbers provide for clear communication about equipment between the Company system operator and the Customer service equipment operator. These device numbers shall be shown on any drawing referencing this equipment and match the labels in the field. Reference Section 4.9 for label specifications.

1.8 Company’s Responsibilities

The electric supply and service installation provisions and costs shall be in accordance with the Company’s filed tariffs.

These specifications are subject to revision without notice. They may be revised or amended as the Company shall determine, or as required by developments of the industry to protect the mutual interests of the Customer and Company. The latest revision shall be used. Additional copies of these specifications and any errata can be obtained from the Company; also see Section 1.5.2 for Company supplemental specifications.

1.9 Inspection, Wiring Adequacy, And Enforcement

The Company requires the Customer to furnish satisfactory evidence of the safe condition of its wiring before any service is connected. This will be in the form of an electrical inspection approval certificate from the authority having jurisdiction (AHJ) or an inspection agency approved by the AHJ and the Company. Inspections shall confirm compliance with the National Electrical Code, any applicable municipal codes, and any specific utility service rules that are in addition to the aforementioned codes.

The Company and its accepted inspection organizations have the authority for enforcement of these rules. An inspection approval sticker shall be placed on the right side of the meter socket enclosure to assure compliance.

The Company requires certificates of inspection:

(A) On all new services, and

(B) To re-energize any existing service that has been de-energized by any disconnect method (cutting service drop or lateral conductors at pole or weatherhead, or padmount transformer, meter removal, etc.) for any of the reasons or durations listed below:

(1) An emergency as a result of accidental damage, fire, flood, weather, or earth related catastrophes.

(2) Theft of service.

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(3) De-energization of service duration exceeding twelve months.

(4) Following 36 months of service inactivity.

(5) Anytime the Company severs electric service for the purpose of the premise wiring system being replaced, altered or extended beyond the service point up to and including the service equipment.

(6) Unsafe condition by any AHJ mandate or by the Company. Examples of unsafe conditions include, but are not limited to, those listed below.

(a) Frayed, split or damaged service entrance cable jacket

(b) Corroded or exposed conductors

(c) Damaged meter socket enclosure or service equipment

(d) Loose or detached point of attachment

(7) Anytime the company discovers evidence of premise wiring modifications

1.10 Disclaimer

1.10.1 Company Approval

The Company’s approval of the Customer’s installation constitutes the Company’s acceptance of the Customer’s proposed arrangement and equipment as meeting the Company’s minimum requirements under these rules and does not relieve the Customer from the obligation of complying with all applicable codes, statutes, rules or regulations.

1.10.2 Use of Electricity

Unless otherwise specified in the applicable regulatory tariff, the Company shall not be liable for damage to the person or property of the Customer or any other persons resulting from the use of electricity or the presence of the Company’s equipment on the Customer's premises.

Relative to any information supplied by the Company in connection with a Customer, it must be understood that the Company’s EPS is a dynamic system that changes from moment to moment as operating demands are made to the system. Furthermore, permanent changes to the system are common which will change the information provided to Customers or their Agents. Although the Company makes every reasonable effort to obtain reliable information and proper calculations, the Company provides no warranty, expressed or implied, as to the accuracy, reliability or completeness of data furnished to Customers or their Agents. National Grid reserves the right to make improvements, upgrades or other changes to the electric system without notice. Such changes may invalidate any information provided.

1.10.3 Condition of Service

The Company shall not be liable for, or in any way in respect of, any interruption, abnormal voltage, discontinuance, or reversal of its service, due to causes beyond its immediate control whether accident, labor difficulties, condition of fuel supply, the decision of any public authority, or failure to receive any electricity for which in any manner it has contracted, or due to the operation in accordance with good utility practice of any emergency load reduction program by the Company or one with whom it has contracted for a supply of electricity, or inability for any other reason to maintain uninterrupted and continuous service; provided, however, that under the terms of the Company’s applicable tariff if the Company is unable for any of the causes enumerated above to supply electricity for a continuous period of two (2) days or more, then upon request of the Customer, the Demand Charge, if any, shall be suspended for the duration of such inability.

1.10.4 Company Warranty Statement

For all voltages and services, the Company will cooperate with its Customers or their representatives.

However, neither by inspection, nor by the rendering of advisory service, nor in any other way, does the

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Company give any warranty, expressed or implied, as to the adequacy, safety, or other characteristics of any equipment, wires, appliances, or devices owned, used, or maintained by Customers.

1.11 Enforcement of Company Requirements

1.11.1 Enforcement Criteria

The Company, the AHJ, and their accepted inspection organization have the authority for enforcement of the Company specifications. The Company’s Specifications for Electrical Installations Committee has the responsibility for: making interpretations of the rules, deciding upon the approval* of equipment and materials, and granting the special permissions contemplated in a number of the rules.

Alternative construction methods not covered in these specifications must be submitted to the Company in writing and be approved* by the Company prior to purchase and/or installation of equipment. The Company shall only grant deviations from these specifications in writing.

Exceptions from the NEC or other codes shall only be granted in writing by the local code authority exercising jurisdiction and filed with the Company.

*Note: See Section 2.0 for the definition of the term “Company Approval”. The Company does not "approve" all aspects of the Customer's equipment or premises wiring installation.

1.11.2 Diversion of Electrical Energy

A diversion of electrical energy is any method or device used by any person that prevents an electric meter from duly registering the quantity of electrical energy supplied by the Company and/or the taking of any electrical current without the Company’s consent.

Where there is evidence of meter tampering or theft of electrical energy, the responsible person or persons shall be liable for prosecution under penalty of law.

1.11.3 Unauthorized Attachment

The Company forbids any unauthorized attachments to its poles and towers, such as banners, signs, clothes lines, antennas, basketball hoops, lighting fixtures, etc. It forbids the use of any of its facilities for placards or other advertising materials. The Company will remove any such unauthorized attachments without notice and may prosecute such trespassing.

The Company forbids any work by contractors on or in any of its facilities without prior written authorization by the Company.

The attachment of antenna systems to Customer-owned electric service masts or poles carrying the Company’s conductors is strictly prohibited due to the possibility of serious results from accidental contacts. Such attachments will be removed immediately upon discovery by the Company, and the removal will be at the Customer’s expense.

2.0 DEFINITIONS

Notes:

1. The following are terms defined as used in this publication.

2. For graphical relationship of defined components and section references in this book, see

Figure 2-1.

Applicant: Any entity (individual, firm, partnership, corporation, association, municipality, or governmental body) requesting a new service from the Company for their own use and not for resale or delivery to others.

Note: The Company must be consulted for specific Applicant rules as they apply in the Company’s applicable tariff.

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Area Lighting (Utility): A utility lighting distribution system that provides lumens on public or private property. (See NEC 90.2(A) where area lighting is not under the exclusive control of utilities and see the NESC for information that covers area lighting under the exclusive control of utilities.)

Authority Having Jurisdiction (AHJ): An organization, office, or individual responsible for enforcing requirements of a code or standard, or for approving equipment, materials, an installation, or a procedure.

(See also NEC Article 100.)

Back-up Service: A service type provided during an unscheduled outage of the Customer’s facility.

Building: A structure which stands alone or which is cut off from adjoining structures by approved fire walls with all openings therein protected by approved fire doors.

Clearance: Required separation mandated by codes or the Company.

Closed Transition Transfer: A “make-before-break” transfer of electrical power sources which makes momentary contact with both synchronized power sources before it breaks contact with one of the two sources. It allows momentary paralleling of the generator and utility system under specific conditions.

One example is a closed transition automatic transfer switch (ATS).

Cold Sequence Metering: Metering equipment located on the Customer’s side of the service equipment.

(See definition for service equipment.)

Company: The electric utility companies doing business as National Grid to which these requirements apply are:

• Massachusetts Electric Company

• Nantucket Electric Company

• Niagara Mohawk Power Corporation

Company Approval: Acceptance for the minimum requirements of National Grid exclusive of the Customer’s obligation of complying with all applicable codes, statutes, rules or regulations. (See Section 1.10.1) Customer: An existing user of recurring electric service. (A contractor or developer performing work on behalf of a Customer is considered an agent of the Customer.)

Seasonal Customer: A Customer who applied for and receives the Company’s service periodically each year, intermittently during the year, or at other irregular intervals.

Design Professional: A Professional Engineer (PE) licensed to practice in the state where service is being installed and who is directly retained by the Customer for that purpose. (If the state licensed PE is representing a multi-member design firm, the firm shall have state certification to practice professional engineering and a copy of such license must be provided to the Company upon request. Any Company requested design professional certification proof must be submitted to the Company in writing upon initial design submission.)

Distribution Line: A distribution line is an electric line, either overhead or underground, including the necessary and ancillary accessories to distribute electric energy, which may provide service to more than one Customer. A distribution line may be located (1) in a street, highway, alley, or (2) on private right-of-way when used or useful to supply two or more Customers at separate premises.

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Drip Loop: Individual conductors formed to prevent the entrance of moisture, and which provide adequate length to meet the Company’s and applicable code requirements.

Electrical Inspector: Inspectors external to the Company who are approved by the municipality in which they are working and recognized by the Company. Electrical Inspectors are responsible for ensuring that the installation complies with all applicable codes and Company requirements, service equipment, material, installations, and/or procedures.

Electric Service: Maintenance by the Company of the appropriate voltage and frequency at the point of delivery shall constitute the delivery of electric service to the Customer. (See definition for Service.)

Electric System Bulletin (ESB): The Company’s specifications for electrical installations which provide technical guidance to applicants and customers and their electrical consultants/contractors for their installation of electrical equipment of interest to the Company. These bulletins include ESB 750-series Errata and Revisions, ESB 750 and supplemental specifications ESB’s 751, 751-NPYR, 752, 753, 754, 755, 756, 757, 758, 759A and 759B.

Emergency: An unplanned, natural or accidental event that affects existing electric service.

Electric Power System (EPS): Company EPS refers to the electric power system owned, controlled, or operated by the Company and used to provide transmission or distribution services to its customers.

Also referred to Company’s system.

Electric Vehicle Supply Equipment (EVSE): Device that connects to the Company EPS and provides energy to a Plug-in Electric Vehicle.

Energy Management System (EMS): As defined by NEC Article 750, A system consisting of any of the following: a monitor(s), communications equipment, a controller(s), a timer(s), or other device(s) that monitors and/or controls an electrical load or a power production or storage source.

Exclusive Control: Generally, covers installation, ownership, restricted access, operation, and maintenance by qualified and authorized persons.

Good Utility Practice: As defined by the NY and MA tariffs.

Hot Sequence Metering: Metering equipment located on the Company’s side of the service equipment.

(See definition for Service Equipment.)

Life Safety System: Those Life Safety Systems legally required by local, municipal, state, federal, or other codes or jurisdictions which may include, but not be limited to fire pumps, that are tapped ahead of the main service equipment and require utility metering.

Line: A system of poles, conduit, wires, cables, transformers, fixtures and accessory equipment used for the distribution of electricity to the public. A line may be located: (1) in a street, highway, alley; or (2) on a private right-of-way when used or useful to supply two or more Customers at separate premises.

Manufactured Home: A factory assembled structure or structures transportable and designed to be used as a dwelling unit with a permanent foundation acceptable to the local AHJ.

Mobile Home: A factory assembled structure or structures transportable on their own running gear and designed to be used as a dwelling unit(s) without a permanent foundation.

Multiple Occupancy Building: A structure, including but not limited to row houses, town houses, condominiums, apartment buildings, commercial and mixed-use buildings, and is designed to contain

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Open Transition Transfer: A “break-before-make” transfer of electrical power sources which breaks contact with one source of power before it makes contact with another. It prevents backfeeding from a generator into the utility line. One example is an open transition automatic transfer switch (ATS).

Plug-in Electric Vehicle (PEV): A vehicle that plugs into Electric Vehicle Supply Equipment to exchange electrical energy.

Point of Attachment: The location of the service drop conductors to a building or structure provided by the Customer and installed to maintain clearances specified by the NEC (Article 230) and by the Company’s requirements. (Service conductors are supported by mechanical attachment to the building or structure.)

Premise: A premise is a unified, undivided parcel of real property under the Customer or Applicant’s control through ownership or lease which is not separated by a public road, right of way, or property belonging to another entity. A premise may or may not contain buildings or structures within the real property.

Premises: The land and buildings of the Customer located on the Customer’s side of the service point.

Primary: The Company’s distribution systems typically operating over 600V.

Qualified [Person/Installer/Electrical Contractor]: One who has skills and knowledge related to the construction and operation of the electrical equipment and installations and has received safety training to recognize and avoid the hazards involved.

Recreational Park: An area primarily, intended for recreation that may contain campgrounds, recreational vehicle sites, modern facilities (cottages), beaches, boat launches, picnic areas, hiking, and other utilities used in modern recreational camping. These areas are used on an intermittent, temporary, seasonal, or irregular basis.

Recreational Vehicle: A vehicular type unit primarily designed as temporary living quarters for recreational, camping, or travel use, which either has its own motive power or is mounted on or drawn by another vehicle. These include: travel trailer, camping trailer, truck camper, and motor home.

Recreational Vehicle Park: An accommodation for Recreational Vehicles where individual site occupancy is normally of short duration.

Restricted Access by the Company: Areas where exclusive control by the Company is maintained.

Riser (aka riser pole, siphon): A structure which accommodates the transition of overhead conductors to underground conductors and vice versa.

Secondary: The Company’s distribution systems typically operating at 600V or below.

Separately Derived System: A premises wiring system whose power is derived from another source of electricity and that has no direct electrical connection, including a solidly connected grounded circuit conductor, to the service.

Service: The conductors and equipment for delivering energy from the Company's distribution line to the wiring system of the Customer served. (See definition for Electric Service.)

Residential Service: Service to one or more dwelling unit(s) providing complete and independent living facilities for one or more persons and which include permanent provisions for sleeping, cooking, and sanitation.

Non-Residential Service: All service types other than residential.

Service Conductors: The conductors from the service point to the service equipment of the Customer supplied by the Company.

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Overhead Service Conductors: The overhead conductors between the service point and the first point of connection to the service-entrance conductors at the building or other structure.

Underground Service Conductors: The underground conductors between the service point and the first point of connection to the service-entrance conductors in a terminal box, meter, or other enclosure, inside or outside the building wall. (Where there is no terminal box, meter, or other enclosure, the point of connection is considered to be the point of entrance of the service conductors into the building.

Underground service conductors are not supplied by the Company.)

Service Connection: One service lateral or service line and its associated service entrance.

Service Drop: The overhead conductors between the last pole or other aerial support of the Company’s electric supply line up to and including the splices connecting to the service point’s service entrance conductors at the building or other structure.

Service Entrance: That part of the Customer's wiring from the point of attachment or termination of the service lateral or service line to and including the service equipment.

Service Entrance Conductors: The wires or cables between the service conductors and the service equipment.

Overhead System Service Entrance Conductors: The service conductors between the terminals of the service equipment and a point usually outside the building, clear of building walls, where joined by tap or splice to the service drop or overhead service conductors.

Underground System Service Entrance Conductors: The service conductors between the terminals of the service equipment and the point of connection to the service lateral or underground service conductors. (Where service equipment is located outside the building walls, there may be no service-entrance conductors or they may be entirely outside the building.)

Service Equipment: The Customer’s necessary disconnecting and protective equipment intended to constitute the main control and cutoff of the supply from the service point. This consists of a circuit breaker(s) or switch(es) and fuse(s) and their accessories connected to the load end of service conductors. The service overcurrent device shall be an integral part of the service disconnecting means or shall be located immediately adjacent thereto.

Service Head (Weatherhead): For cable in conduit risers or Type SE cable, a service head is a listed device that is raintight for the purpose of preventing water from entering service entrance conductors, raceway, or equipment.

Service Line or Lateral: The Company’s electric line including the necessary and ancillary accessories to connect a distribution line to an individual Customer's meter or point of attachment. (A service line or service lateral, at the Company's discretion, may be connected to two or more meters at a single premise.

Wiring along the outside of the Customer's house or building shall not be included in the service line or service lateral.)

Service Line: The overhead conductors between the utility electric supply system and the service point. (A service line does include a service drop.)

Service Lateral: The underground conductors between the utility electric supply system and the service point.

Service Point: The point of connection between the facilities of the Company and the Customer's premises wiring. (The service point can be described as the point of demarcation between where the serving utility ends and the premises wiring begins. The serving utility generally specifies the location of the service point based on their conditions of service. (Refer to Figure 1.5-1 and Figure 2-1.)

Service Riser Mast: A rigid metal conduit containing service entrance conductors that supports the service drop to maintain required vertical clearance.

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Service Riser Pole: The Company’s pole where the Customer’s underground service conductors emerge to connect to the Company’s overhead distribution line or transformer.

Short-term Service: A service that is recurrently required only for short periods each time, either periodically each year, intermittently during the year, or at other irregular intervals. (Typically used by seasonal Customer.)

Standby Power System: An alternate source of electricity incorporating necessary transfer equipment intended to supply power to selected loads upon loss of the normal power supply.

Stretch Code: A stretch code is a locally mandated code or alternative compliance path that is more aggressive than base code. An example of Stretch Code requirements may be pre-wiring for future electrification loads and DER.

Supply Point: The point of connection of the Company’s service lateral or service line and the facilities of the Company.

Tariff: Document containing regulatory framework by which the Company administers fair and consistent handling of all applicants and customers within the Company’s State-specific service territory.

Temporary Service: A non-recurring service intended to be used for a short time only, not to exceed one year for residential or two years for commercial applications.