Not recommended; requires licensed electrician. High risk of electrical shock, fire, and damage to electrical system if not installed correctly or not compliant with code.
Installation requires specialized electrical knowledge and adherence to specific NEC articles, particularly given the 2023 NEC mandatory requirements for dwelling unit services. Proper grounding and connection to existing service equipment are critical for effective protection against DuPage County's variable weather, including frequent thunderstorms. Improper installation carries high risks.
Project Guidelines & Rules
Permitting and Inspections
3 Rules
Permit Application
IRC R105.1, NEC 90.4. All electrical installations and modifications require a permit from your local building department.
Licensed Contractor Requirement
DuPage County regional standard. All electrical work, including the installation of Whole House Surge Protectors (WHSPS), shall be performed by an Illinois licensed electrical contractor.
Final Electrical Inspection
IRC R109.1.3, NEC 90.4. A final electrical inspection is required by the local building department to verify compliance with all applicable codes before the system is energized for permanent use.
General Electrical System Requirements
4 Rules
Service Disconnecting Means
NEC 230.70. Ensure the service disconnecting means is appropriately rated and accessible for safe installation and maintenance of the WHSP.
Working Space
NEC 110.26. Maintain required working clearances around electrical equipment, including the service panel where the WHSP will be installed.
Equipment Enclosures
NEC 110.28. Electrical equipment enclosures must be suitable for the environment and maintain their integrity.
Protection from Physical Damage
NEC 300.4. Conductors and equipment shall be protected from physical damage appropriate for DuPage County construction standards.
Surge Protective Device (SPD) Specifics
4 Rules
Mandatory SPD Installation for Dwelling Units
NEC 230.67(A). For dwelling units, all services supplying dwelling units shall have a Type 1 or Type 2 SPD installed at the service or within the service equipment. This is a mandatory requirement for new services and significant service modifications.
SPD Rating (Nominal Discharge Current)
NEC 230.67(B). The SPD must have a minimum nominal discharge current rating (I_n) of 10 kA.
SPD Location
NEC 230.67(A), NEC 285.4, NEC 285.5. The SPD shall be installed in or on the service equipment or immediately adjacent thereto. Placement should minimize conductor length.
SPD Listing
NEC 285.3. SPDs shall be listed for the purpose (e.g., UL 1449).
Grounding and Bonding for SPDs
3 Rules
Grounding Electrode Conductor (GEC) Connection
NEC 285.25. The SPD shall be connected to the service grounding electrode conductor or to the equipment grounding terminal bar in the service equipment enclosure.
Connection Path Length and Bends
NEC 285.12. Conductors used to connect the SPD to the line side, load side, and grounding system shall be as short as practicable and shall avoid unnecessary bends. This is critical for optimal SPD performance in transient events common to DuPage County.
SPD Conductor Sizing
NEC 285.21. SPD conductors shall not be smaller than 14 AWG copper or 12 AWG aluminum. Local practice often dictates 10 or 8 AWG for optimal performance and robustness.
Installation Practices and Maintenance
4 Rules
Conductor Routing
NEC 285.12. Conductors must be routed to minimize impedance, avoiding sharp bends and excessive length, which can significantly degrade SPD performance during a surge event.
Environmental Suitability
NEC 110.11. Electrical equipment shall be approved for the environment in which it is installed, considering DuPage County's range of temperatures and moisture conditions.
Labels and Markings
NEC 110.21. Equipment and circuits must be clearly labeled to identify the SPD and its associated circuits for safety and future maintenance.
Coordination with Existing Plumbing Systems
Illinois Plumbing Code (as applicable for bonding). Ensure no interference with existing plumbing or gas systems, especially regarding bonding requirements per NEC 250.
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