Annex G. Administration and enforcement
Annex G is not part of the requirements of this NFPA document and is included for informational purposes only. This annex is informative unless specifically adopted by the local jurisdiction adopting the NEC.
If you read 80.9© additions alterations or repairs. Additions alteration or repairs to any building structure or premises shall conform to that required of a new building without requiring the existing building to comply with all of the requirements of this code. Additions, alterations, installation or repair shall not cause existing structure to become unsafe or to adversely affect the performance of the building as determined by the AHJ. Electrical wiring added to existing service feeder or branch circuit shut that resulted in installation that violates the provisions of the carried force at the time of the additions were made.
80.9(B) existing installations. Existing electrical installations that do not comply with the provisions of this code shall be permitted to be continued in use Leslie authority having jurisdiction determines that the lack of conformity with this code presents an imminent danger to occupants. Where changes are required for correction of hazard a reasonable amount of time shall be given for compliance depending on degree of the degree of the hazard.
IMO to require a homeowner to potentially to spend many thousands of dollars to bring older house into compliance with the standards due to service change could result in more of a hazard by allowing older and perhaps outdated systems remain service to avoid having to upgrade the house. This could also lead to unpermitted work being performed to remain under the radar of the upgrade requirement needed by upgrading the service.
Along with the cost it would also be the issue of having to upgrade to today’s circuits, receptacle spacing and numerous issues that did not exist when the house was constructed.
While I would love to see this happen from a business standpoint I think it would be very hard for a local jurisdiction to impose a financial hardship like the adoption of 80.9 could lead to.
A good example of this would be local jurisdictions not requiring the use of AFCI breakers on a panel changeout is done. There can also be existing conditions which will not allow older circuits to meet today’s standards also.