Originally Posted By: jtedesco
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Existing Electrical Installations
It states that "Existing electrical installations that do not comply
with the provisions of the NEC? are permitted to be continued
in use unless the authority having jurisdiction determines that
the lack of conformity with the NEC? presents an imminent
danger to occupants.
The "Authority Having Jurisdiction" is defined as: "The organization,
office, or individual responsible for approving equipment,
materials, an installation, or a procedure."
Where changes are required for correction of hazards, a reasonable
amount of time will be given for compliance, depending
on the degree of the hazard. Additions, alterations, or
repairs to any building, structure, or premises is required to
conform to that required of a new building without requiring the
existing building to comply with all the requirements of the
NEC?. These additions, alterations, installations, or repairs
must not cause an existing building to become unsafe or to
adversely affect the performance of the building as determined
by the authority having jurisdiction. Electrical wiring added to
an existing service, feeder, or branch circuit must not result in
an installation that violates the provisions of the NEC? in force
at the time the additions are made. Existing buildings that are
occupied at the time of adoption of this NEC? are allowed to
remain in use provided the following conditions apply: (1) The
occupancy classification remains unchanged and (2) There
exists no condition deemed hazardous to life or property that
would constitute an imminent danger.
There can be no doubt that the type of wiring identified here in
the advertisements from many years ago for so little money,
would certainly not meet today?s demands, yet there are still
thousands of properties around the USA that are still with this
type of system in use! The NEC? still includes permission for
the use of Knob and Tube wiring and can be found it Article
394. See Section 394.10 Uses Permitted. Concealed knob and-
tube wiring is allowed to be installed in the hollow spaces
of walls and ceilings or in unfinished attics and roof spaces as
provided in 394.23 only as follows: (1) For extensions of existing
installations (2) Elsewhere by special permission.
Special Permission is defined as the written consent of the
authority having jurisdiction.
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Document provided by Joe Tedesco,
Electrical Code Consultant
Joe Tedesco, NEC Consultant