Not recommended. Due to the high risk of severe electrical shock, arc flash, and property damage, this work must be performed by a licensed electrician. Permits and utility coordination are mandatory.
This project involves direct interaction with the main electrical service entrance and significant potential for electrical hazards. Requires precise adherence to NEC requirements for service equipment, grounding, and bonding, and often involves coordination with the utility provider.
Project Guidelines & Rules
General Requirements & Permitting
3 Rules
Obtain all required permits from your local building department prior to commencing work.
2024 IRC R105.1, R105.2 (Permits required for electrical work)
Work shall be performed by or under the direct supervision of a licensed electrical contractor.
DuPage County regional practice, local municipal licensing requirements
A final inspection by the local building department is mandatory upon completion of work.
2024 IRC R109.1.3 (Electrical Inspections)
Safety & Disconnect Procedures
3 Rules
De-energize and utilize a lockout/tagout procedure on the electrical service at the utility pole or meter base (as permissible by utility) before working on the main breaker or service conductors.
OSHA 29 CFR 1910.147 (Control of Hazardous Energy), NEC 110.16 (Arc-Flash Hazard Warning)
Utilize appropriate Personal Protective Equipment (PPE) for electrical work, including arc-rated clothing, insulated gloves, and eye protection.
NEC 110.16(A) (Arc-Flash Hazard Warning), NFPA 70E
Coordinate service disconnect and reconnect with the local utility provider as required.
Local utility requirements, NEC 230.82(3)
Equipment & Material Standards
4 Rules
All replacement main breakers, enclosures, and associated equipment shall be listed and labeled by a nationally recognized testing laboratory.
NEC 110.3(B) (Installation and Use), NEC 90.7 (Examination of Equipment)
The replacement main breaker and service equipment shall have an interrupting rating sufficient for the maximum available fault current at the service entrance.
NEC 110.10 (Circuit Impedance and Other Characteristics)
Conductors shall be of approved type and properly sized for the intended overcurrent protection and anticipated load, considering ambient temperature and conduit fill.
NEC 240.4 (Protection of Conductors), NEC 310.15 (Ampacities)
Enclosures for service equipment shall be suitable for the environment and protected from physical damage (e.g., NEMA 3R for outdoor applications).
NEC 110.28 (Enclosure Types), NEC 230.50 (Protection Against Physical Damage)
Installation Requirements (2023 NEC Focus)
7 Rules
The service disconnecting means shall be readily accessible, either outside of the building or inside nearest the point of entrance of the service conductors.
NEC 230.70(A)(1) (Location)
The service disconnecting means shall be permanently marked to identify it as the service disconnect.
NEC 230.70(B) (Marking)
Maintain a dedicated working space in front of the electrical service equipment of not less than 30 inches wide, 36 inches deep, and 78 inches high (or height of equipment).
NEC 110.26(A)(1) (Working Space)
A complete grounding electrode system and proper bonding of all metal parts, equipment, and enclosures shall be established or maintained.
NEC Article 250, specifically 250.24 (Grounding and Bonding of Service-Supplied Alternating-Current Systems), 250.50 (Grounding Electrode System)
The main bonding jumper and equipment grounding conductors must be correctly sized and installed as per code.
NEC 250.28 (Main Bonding Jumper), 250.102 (Bonding Jumpers)
If replacing or installing underground service conductors, they must be installed at or below the 42-inch frost depth for DuPage County.
NEC 300.5 (Underground Installations) Table 300.5; DuPage County regional standard for frost depth
All unused openings in cabinets, boxes, and fittings shall be effectively closed to afford protection substantially equivalent to the wall of the equipment.
NEC 110.12(A) (Integrity of Electrical Equipment)
Plumbing & Other Trades Consideration
1 Rules
Ensure that electrical work does not compromise the integrity, accessibility, or functionality of existing plumbing systems, gas lines, or other utility services.
Illinois Plumbing Code, Section 890.130 (Protection of Structures and Systems); General Construction Best Practices
