Electrical Service Entrance Requirements in New Jersey

New Jersey's electrical service entrance is the assembly of conductors, fittings, and equipment that delivers utility power from the street connection to a building's main distribution point. Requirements governing this assembly are set by state-adopted editions of the National Electrical Code (NEC), enforced through local code officials, and coordinated with the serving electric utility. Getting these requirements right determines whether a structure receives a certificate of occupancy, passes inspection, and operates safely under rated load conditions.

Definition and scope

The service entrance encompasses every component between the utility's point of delivery — typically the meter socket or utility transformer — and the building's main service disconnect or panelboard. Under the NEC as adopted by New Jersey, this assembly is defined in Article 230 and includes service-entrance conductors (overhead or underground), the weatherhead or conduit riser, meter enclosure, main disconnect, grounding electrode system, and bonding conductors.

New Jersey administers its building and electrical codes through the New Jersey Department of Community Affairs (DCA), Division of Codes and Standards. The state adopts the NEC on a scheduled cycle; the 2017 NEC was in effect for many years before the state transitioned to the 2021 NEC. Specific local amendments may apply at the municipal level.

Scope limitations: This page covers requirements applicable to residential, commercial, and light-industrial premises within New Jersey's jurisdiction under the New Jersey Uniform Construction Code (UCC). It does not address federally owned facilities, utility-owned infrastructure on the supply side of the meter, or high-voltage transmission equipment. Requirements under New Jersey Board of Public Utilities (NJBPU) tariffs — governing the utility's service connection standards — fall outside the UCC scope and are subject to each utility's filed rules. For a broader orientation to New Jersey's electrical framework, see the New Jersey Electrical Systems overview.

How it works

A service entrance installation follows a structured sequence governed by NEC Article 230 and the New Jersey UCC:

1. Permit application — The licensed electrical contractor submits a permit application to the local enforcing agency (LEA) before any work begins. Performing work without a permit exposes property owners and contractors to stop-work orders, fines, and mandatory demolition of non-compliant work.
2. Utility coordination — The contractor or owner contacts the serving utility (PSE&G, JCP&L, Atlantic City Electric, or Rockland Electric, depending on territory) to confirm service voltage, available fault current, and meter socket specifications. Utilities publish tariff schedules and equipment standards through NJBPU-filed rate cases.
3. Sizing and load calculation — Service size is determined by load calculation per NEC Article 220. Residential services are commonly sized at 100, 150, or 200 amperes for single-family dwellings; larger structures may require 400-ampere or higher services. Load calculation concepts govern the methodology.
4. Installation — Conductors, raceways, meter enclosures, and disconnects are installed per approved plans. Overhead services must meet NEC 230.9 and 230.24 clearance requirements (minimum 10 feet above finished grade at pedestrian areas, 12 feet above residential driveways, 18 feet above public roads). Underground services must comply with NEC burial depth tables — 24 inches for conductors in rigid metal conduit under driveways, for example.
5. Grounding and bonding — The grounding electrode system, governed by NEC Article 250, must bond to the building's water pipe, ground rods (minimum 8-foot length per NEC 250.52), and any structural steel. Grounding and bonding requirements expand on this topic.
6. Inspection — The LEA inspector verifies installation before the utility energizes the service. The New Jersey electrical inspection process describes what inspectors verify at each stage.
7. Utility energization — After a passed inspection, the utility installs the meter and energizes the service. No contractor may energize a new service without utility authorization.

For a conceptual explanation of how these systems function together, see How New Jersey Electrical Systems Work.

Common scenarios

Residential new construction: A new single-family home in New Jersey most commonly receives a 200-ampere, 120/240-volt single-phase service. The service entrance conductors are typically aluminum — aluminum is code-compliant and standard for service entrance applications under NEC 310.106. A 200-ampere underground lateral requires conductors rated for direct burial or installed in conduit at the depths specified in NEC Table 300.5. See New Jersey Electrical for New Construction for additional requirements.

Panel upgrade on existing building: Upgrading from a 100-ampere to 200-ampere service on an older home requires a new permit, new service entrance conductors sized for the higher ampacity, a new meter socket rated for 200 amperes, and a new main panel. New Jersey Electrical Panel Upgrades addresses this scenario in detail, including the common requirement to upgrade the grounding electrode system to current NEC standards at the time of the upgrade.

Commercial or multifamily building: Three-phase, 120/208-volt or 277/480-volt services are standard for commercial and multifamily applications. These services require utility pad-mount transformers and underground lateral conductors in rigid conduit. Fault current at these service points frequently exceeds 10,000 amperes, making interrupting-capacity ratings on overcurrent devices critical. New Jersey Electrical for Multifamily Housing and Commercial Electrical Systems cover applicable requirements.

Solar and battery storage interconnection: Adding a photovoltaic system or battery storage changes the service entrance configuration. NEC Article 230 and Article 705 govern interconnection points, and NJBPU net metering rules apply. New Jersey Solar and Battery Storage Electrical addresses the additional requirements.

Decision boundaries

Distinguishing which rules apply depends on two primary classification axes: service voltage class and occupancy type.

The dividing line between owner-installed and utility-installed equipment is the meter socket: the socket enclosure and all load-side equipment are the owner's responsibility under the UCC; the meter itself and all line-side conductors are the utility's equipment. This boundary is a frequent source of confusion during inspections.

The regulatory framework governing these classifications is documented at Regulatory Context for New Jersey Electrical Systems. Overcurrent protection sizing and interrupting capacity requirements — critical at large commercial service entrances — are addressed at New Jersey Electrical Fault and Overcurrent Protection. Metering-specific installation requirements are covered at New Jersey Electrical Metering Requirements.

Licensed electrical contractors performing service entrance work in New Jersey must hold a valid license issued through the New Jersey Board of Examiners of Electrical Contractors. Work performed by unlicensed individuals on service entrances is a violation of the New Jersey Electrical Contractors Licensing Act (N.J.S.A. 45:5A-1 et seq.).

References

• New Jersey Department of Community Affairs, Division of Codes and Standards — administers the New Jersey Uniform Construction Code, including adopted NEC editions
• New Jersey Board of Public Utilities (NJBPU) — regulates utility service standards, tariffs, and net metering rules
• National Fire Protection Association — NFPA 70 (National Electrical Code), 2023 edition — primary electrical installation standard adopted by New Jersey; updated to the 2023 edition effective January 1, 2023
• New Jersey Uniform Construction Code (N.J.A.C. 5:23) — state administrative code governing building and electrical permits and inspections
• New Jersey Electrical Contractors Licensing Act, N.J.S.A. 45:5A-1 et seq. — licensing requirements for electrical contractors performing service entrance work