Thank you for reading Reno.
Unfortunately , glowing connection technology flies in the face of afci technology.
The fundamental theory of electrical physics being the crux of the issue.
The 'powers that be'
have ,in concert with multiple oversight entities , made quite the effort to change canon and/or ignore this reality.
If you'll please indulge me ,i'll post evidence
to this end>
Concern — NEC CMP-2 accepted adoption of this new
requirement based on inaccurate and misleading documentation
submitted by the manufacturers of these devices.
Concern — At a recent meeting of NEC CMP-2, UL
made a presentation that demonstrated that the AFCI
devices would not detect all arcing faults. The UL
representative described the basic technical problems
with the device. It will not be able to detect all arcs
that may produce a fire. Asked if the device will
detect all arcs between the breaker and the first outlet,
the answer was no. The answer was the same for
detecting arcs in an outlet, in the cord from the outlet
to the appliance, and the appliance itself. Asked what
the percentage of arcs may be detected, the answer
was they do not know
Concern — Unfortunately, the devices can pass only
four of the tests, not the full 14 tests needed for this
product to protect residential occupancies as outlined
in a UL study for the U.S. Consumer Product Safety
2-76 Log #687 NEC-P02 Final Action: Reject
Submitter: Robert Huddleston, Jr., RLH Engineering Consulting
Recommendation: Revise text to read as follows:
210.12(A): All 120-volt, single phase, 15- and 20-ampere branch circuits
supplying outlets…shall be protected by a listed arc-fault circuit interrupter,
combination-type, installed to provide parallel arc fault protection of the branch
210.12(B): Branch Circuit Extensions or Modifications – Dwelling Units. (1)
A listed combination-type AFCI located at the origin of the branch circuit.
Substantiation: A CD shall be provided to each Code-panel Principal Voting
Member showing actual real-world testing of combination-type AFCIs.
This testing clearly demonstrates and proves that these devices do not trip when sensing a real-world series arc-fault, as they are advertised. Regardless of the type of series arc fault (loose connection, broken wire, damaged cord, junction box splice failure), combination-type AFCI devices do not trip and provide protection even though they claim to provide such. Please view the Powerpoint presentation on the CD and click on the imbedded video for testing results. It is completely inappropriate for the National Electrical Code to specify and require equipment that does not work properly. It is sincerely hoped that the Panel will correct this issue.
Note: Supporting material is available for review at NFPA Headquarters.
Panel Meeting Action: Reject
Panel Statement: Replication of the experiments shown in the video shows
that there is minimal actual arcing occurring. When arcing does occur, causing the sparking seen in the video, its duration is very short and the energy is three orders of magnitude below what is required to ignite the NM cable or surrounding materials.
The waveform looks the same as when a wall switch is switched on and off.
If the AFCI responded to this waveform it would increase the incidence of
unwanted tripping while not contributing significantly to mitigating fire hazards.
Number Eligible to Vote: 11
Ballot Results: Affirmative: 10 Abstain: 1
So CMP-2 was basically informed by afci manufacturers that they've no idea just what arc(s) an afci can detect, yet they turn around and substaintiate rejection of Mr Huddleston with their intricate knowledge of them AND their waveforms