Respectfully, you are missing the point. Armored grounding wire is NOT a bare copper conductor inside a raceway (conduit).Are you asking why the Armor Grounding Wire -- a specific designed product for working as GEC – needs additional bonding at both ends? Obviously if such product already meets the code, that it is already having the conduit bonded at both ends to the inside copper conductor, then it should meet the code. But in practice I would think many cases people buy a 30 ft armor wire and only use a fraction of the length for the job, meaning they cut the cable to length, which means the cut end needs to be bonded.
Here is a good article to explain the choking effect: http://www.ecmag.com/section/codes-standards/guardian-ground
“The magnetic field’s strength increases in proportion to the amount of current in the conductor. In many cases, the magnetic lines of force in the conductor are induced into the conduit enclosing the grounding electrode conductor; they can even surpass the saturation point of the steel raceway. At the point where the grounding electrode conductor exits the conduit, the magnetic lines of force generated by the fault current in the conductor will try to be induced on the end of the conduit, creating a saturation point that exceeds the conduit’s capacity. The steel conduit, in this instance, acts like a steel core of a coil to concentrate the magnetic lines of force. This condition is often referred to as the “choke effect” because it is actually the restriction of a grounding electrode conductor from performing its function. Because of this, specific bonding requirements are necessary for ferrous metal raceways that contain grounding electrode conductors. This is not a concern for grounding electrode conductors that are installed in PVC conduit or other nonferrous metal raceways such as aluminum or brass conduit.”
I used "raceway" in a general way to describe any metal enclosure that houses one or more conductors, including RC, EMT, flex conduit, and the steel armor of the "Armor grounding wire".Respectfully, you are missing the point. Armored grounding wire is NOT a bare copper conductor inside a raceway (conduit).
And the listing, as KDER - Grounding and Bonding Equipment, puts it outside of Armored Cable or Metalclad Cable. So I doubt that it is even a cable.
The Code is silent about bonding the armor of Armored Grounding Wire to the wire contained in the armor.
Armored grounding wire is not cable.A factory assembly of two or more conductors having an overall covering.
Actually, if you go back to the Opening Post (OP) and go through the first ten posts you will see that the discussion is very much about what Armored Grounding Wire actually is and where, in the Rules of the enforceable Code does and don'ts are printed.Come on, we were discussing about the rule of bonding GEC ferrous enclosure, not the definition of cable armor.
So, you are claiming, the NFPA published definition of "cable" also includes (silently) something to the effect that any single bare conductor inside an overall outer covering is also two or more conductors. . . I suspect that this is because you "want" it to. . . not because of hard evidence of how an Armored Grounding Wire chokes unbalanced current, compared to a naked bare copper wire or compared to a bare copper wire in raceway bonded at both ends of a ferrous raceway.I wanted to say that the name "cable armor" in the article and your "Armor grounding wire" are interchangeable, they refer to the same device.
A violation of what? Please cite chapter and verse.My point is that even if a legitimate Armor Grounding Wire was used for GEC, and only the bare copper wire was clamped to the grounding electrode, then it is a violation.
And where is this written in the NEC specifically with respect to Armored Grounding Wire?Only when the steel armor and the copper wire were clamped together at both ends – bonding the armor to the copper wire – then this is compliant.
Please provide actual citations from the NEC instead of a paraphrase.NEC says:
1) Armor grounding Wire: the steel armor must be bonded to the copper wire at both ends
"standard terminology" . . . i.e. what you claim it should mean. I understand that you want different words in the NEC than are there. But the words that are there are the legally adopted and enforceable words. . . period.I agreed that the article is better off using the standard terminology, i.e Armor grounding wire instead of cable armor in the context, for less confusing.
Kerney connectors are made too, but aren't needed or required.
Please read the Article 100 Definition of "Enclosure". I have already shown you the NFPA Glossary definition of "Cable". . . you are absolutely grasping at straws and need to settle into the fundamental definitions.1)
From NEC 2011, 250.64 Grounding Electrode Conductor Installation.
“ it shall be protected in rigid metal conduit (RMC), intermediate metal conduit, (IMC) rigid polyvinyl conduit (PVC), reinforced thermosetting resin conduit (RTRC), electrical metallic tubing (EMT), or cable armor.”
(E) Enclosures for Grounding Electrode Conductor. Ferrous (iron/steel) raceways, boxes, and enclosures containing the grounding electrode conductors must have each end of the ferrous metal raceway, box, and enclosure bonded to the grounding electrode conductor [250.92(A)(3)]. Figure 250.115
From (1) I interpret cable armor as an enclosure for GEC.
Yes (2) does say that for boxes, enclosures and raceways, NONE of which is Armored Grounding Wire, KDER.And (2) says it must have each end bonded to the GEC.
All the Code you are struggling with is old and settled. Armored Grounding Wire, KDER, is an old and understood product. There is a reason the Code is silent. The Armor and the bare Grounding wire, TOGETHER, are Grounding and Bonding Equipment. As a case in point of that, your reference to the MVP99 clamp includes the instructions:Enough to satisfy everyone? For me I think this is more than enough to say that Al's Armored Grounding Wire must have each end of the armor bonded to GEC, unless Al can show that said armored grounding wire assembled at the factory already having each end of the steel armor bonded to the inside conductor.
11. No need for Armor removal from the wire.