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Specifications forElectrical Installations202 Covering National Grid’s Service Areasin Massachusetts (MA), New York (NY)and Rhode Island (RI)Electric System Bulletin 750
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 assistancewhenever you have questions on information in this booklet.While you’re planning electrical and mechanical systems for your next project, our representatives will workclosely 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 mostimportant, 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 CenterPhone Number andHours of OperationFaxMailing AddressNon-English-Speaking CustomersPara Clients que habian EspanolHearing/Speech-ImpairedCustomersSpecialized Commercial & IndustrialBusiness GroupEmergency Numbers – does notreplace 911 emergency medicalservicesLife-Threatening ElectricEmergencyLife-Threatening Gas EmergencyNew York1-800-642-4272Mon-Fri 7:00 am – 7:00 pmAfter 7:00 pm & Wknds –Emergency only1-315-460-9270 (for newservice applications only)1-800-322-32237111-800-664-6729Mon-Fri 8:00 am – 5:00 pm1-800-892-23451-800-260-00541-315-350-3967 Faxhttps://ngrid.com/eportalBy PhoneFor Electric Inspectors, to release amunicipal wiring inspectionNew Residential or CommercialDevelopmentsDig Safe RequestsHazard Identification HotlineWhen working near power lines orhigh voltage ine by InternetCustomer Order Fulfillment1-800-322-3223Mon-Fri 7:00 am – 7:00 pmSaturday 7:00 am – 5:00 pmNational GridCustomer Service CenterPO Box 960Northborough, MA 01532-0960Contractor ServicesFor Order Initiation and InspectionReleaseBy FaxRhode IslandNational GridCustomer Service Center300 Erie Boulevard W.Syracuse, NY 13202-4250Power OutagesView/Upgrade/Demo and InspectionRelease PortalMassachusettsNot ionalgrid.comMon-Fri 7:30 am – 5:00 pm1-800-375-7405Mon-Fri 8:00 am – 4:30 pmhttps://ngrid.com/eportal1-800-882-0322 Using Electric1-888-266-8094Service Request l-Resources/Electric-Specifications1-800-664-6729 or 1-800-260-0054 (for assistance with pending electric service requests)1-800-375-7405 NE Only; 1-800-664-6729 NYMon-Fri 8:00 am – 4:30pm24-hour automated system. *For single service requests omworkrequest@nationalgrid.com(To e-mail AutoCAD or MicroStation drawings – NY Only)(MA and RI)1-800-962-7692 or 8111-888-DIGSAFE (1-888-344-7233) or 811Dig Safely NYDig Safe System Inc.811 is the nationwide number; see 2-42721-888-625-3723Also, visit https://www.nationalgridus.com for this and other National Grid information
Specifications for Electrical Installations2021Covering National Grid’s Service Areas inMassachusetts (MA), New York (NY) and Rhode Island (RI)Electrical Service Bulletin (ESB) 750
National Grid / Specifications for Electrical Installations / 2021PREFACEThese 2021 specifications consolidate and replace the “Specification for Electrical Installation 2020, andare in effect for the following National Grid companies: Massachusetts Electric CompanyNantucket Electric CompanyThe Narragansett Electric CompanyNiagara Mohawk Power CorporationThese specifications, which protect the mutual interests of the Customer and Company, may be revisedor amended from time to time in keeping with developments and progress of the industry. For the latestofficial version of this document please visit the Company’s web site address -Resources/Electric-Specifications.Printed copies of these specifications are not document controlled and may be obtained from theCompany by contacting the applicable Company representative. Therefore, the online version will alwaysprevail over any uncontrolled printed documents. The 2021 version incorporates the ESB 750 SeriesErrata and Revisions issued in July 2020.Where referenced in tariffs by the National Grid companies, this new edition is synonymous with thedesignations as “ESB 750 Book” or “Information and Requirements Book” and meets the samerequirements.For the latest authorized version, please refer to the Company’s website at sources/Electric-Specifications1
National Grid / Specifications for Electrical Installations / 2021TABLE OF CONTENTSPREFACE . 1TABLE OF CONTENTS . 2PROCESS AND INFORMATION . 9Obtaining Electric Services . 9Safety Information . 11PART A – GENERAL INFORMATION . 2.23.2.33.33.3.13.3.23.3.33.3.43.3.5INTRODUCTION . 12Purpose . 12Scope . 12Rate Schedule . 12Cooperation and Time Requirements . 12Codes, Standards, and References . 12References . 13Supplemental Company Specifications . 14Requests for Information. 14Customer’s Responsibility. 14All Customers . 14Customers Served at Voltages Above 600V . 15Design Acceptance . 15Operation and Maintenance. 15Company’s Responsibility . 15Inspection, Wiring Adequacy, and Enforcement . 15Disclaimer . 16Company Approval . 16Use of Electricity . 16Condition of Service. 16Company Warranty Statement . 16Enforcement of Company Requirements . 16Enforcement Criteria . 16Diversion of Electrical Energy . 17Unauthorized Attachment . 17DEFINITIONS . 17GENERAL SERVICE CONNECTION REQUIREMENTS . 22Application for Service . 22Application . 22Pubic Grants and Special Permits . 22Easements . 22Number of Services . 23With Respect to Building and Premise . 23Electricity Delivered Through More Than One Meter . 23Multiple Service Requests . 23Temporary Service . 23Company Facilities . 23Location . 24Equipment . 24Duration . 24Cost . 24For the latest authorized version, please refer to the Company’s website at sources/Electric-Specifications2
National Grid / Specifications for Electrical Installations / .33.83.93.103.11Access . 24Identification of Employees . 24Character of Service . 25Voltages Available . 25Available Services . 25Table 3.7.1-1: Available Services Below 600V . 25New Customers (Applicants) . 26Existing Customers . 26Customer Expansion . 26Voltage Migration at Customer’s Request . 26Voltage Migration at Company’s Request . 26Service No Longer Standard . 27Load Balance. 27Increase in Service . 27Discontinuance of Service . 27PART B – ELECTRIC SERVICE REQUIREMENTS . .5.2SERVICE CONNECTIONS . 28General. 28Rights-of-Way, Easements . 28Number, Routing and Location of Service Laterals or Service Lines . 28Relocation of Services . 29Voltage Drop Considerations . 29Minimum Size Single-Phase Service Connections . 29Service Conductor Splicing . 30Routing of Metered and Unmetered Conductors Within a Building. 30Temporary Service . 30Service to Manufactured and Mobile Homes, Mobile Home Parks, and RecreationalVehicle Parks. 31Service to Manufactured and Mobile Homes and Mobile Home Parks . 31Service to Recreational Parks . 31Service to Tiny Homes . 31Overhead Secondary Voltage Service Connection (Under 600V) . 32General. 32Service Attachment, Location . 32Customer-Owned Service Pole . 32Overhead Service Line Clearances . 32General Overhead Service Line Clearances . 32Table 4.2.4.1-1: Overhead Service Line Clearance Requirements. 33Clearances to Swimming Pools . 34Service to Low Building . 34Riser Mast Requirements . 34Table 4.2.4.4-1: Galvanized Riser Mast Bracing Requirements . 35Service Drop and Connection to Service Conductors . 36Residential Overhead Service Upgrade . 36Overhead Primary Voltage Service Connection (2.4kV to 46kV inclusive) . 36Overhead Transmission Voltage Service Connection . 37Underground Secondary Service Voltage Connection (Under 600V) . 37General. 37Facilities in Shared Trench . 37For the latest authorized version, please refer to the Company’s website at sources/Electric-Specifications3
National Grid / Specifications for Electrical Installations / .3.15.45.56.06.16.2Conduit System . 38Underground Secondary Service Connection from the Company’s OverheadDistribution Supply Line . 38Customer-Owned Underground Secondary Service Conductors . 38Company Riser Pole Attachments . 39Underground Secondary Service Connection from the Company’s UndergroundSupply Lines . 39General. 39Radial Fed Underground Secondary Services . 39General. 39Termination at Two-Foot Line . 39Termination at Termination Box Inside Customer Building . 39Network Areas and Underground Lines . 40Underground Residential Distribution (URD) Areas . 40Underground Secondary Service Connection . 40Underground Secondary Service to Meter Pedestals and Meter Posts . 40From a Company-Owned Primary Underground Service Lateral . 41From an Outdoor Single-Phase Pad Mounted Transformer . 41From an Outdoor Three-Phase Pad Mounted Transformer . 41Service to Buildings Requiring Multiple Meter Rooms or Multiple Meter Locations . 41Underground Primary Voltage Service Connection (from 2.4kV to 46kV inclusive) . 41Underground Transmission Voltage Service Connection . 41Access Roads. 42SERVICE EQUIPMENT . 42General.
Specifications for Electrical Installations 202 Covering National Grid’s Service Areas in Massachusetts (MA), New York (NY) and Rhode Island (RI)
