Взлет и падение электропроводки на роликах: как страховщики признали три миллиона домов нестрахуе...

A porcelain knob nailed to a joist in 1912 is the reason millions of American houses can't buy a homeowner's policy. Not because it burned. Because of fifteen words added to the National Electrical Code in 1987, passed ten to one, with no fire loss data behind them. What no one else is telling you: NFPA's own engineering staff later described that rule as "preemptive," and the DOE branch chief who banned insulation over knob-and-tube admitted in writing that his own program had produced no problems. In this video: why the 1897 code was written by insurance men, the one-inch air gap that made the whole system work, why conduit cost three times as much in 1909, soldered pigtail splices, the real defects — no ground, fused neutrals, the Carter system banned in 1923 — overfusing and the penny behind the fuse, Jarrell Blair's 1986 proposal to Code Panel 7, David Roberts dissenting on the record, Larry Seekon's comment about an elderly widow on Social Security, the University of Illinois investigation that went looking for the missing evidence, the 1988 DOE weatherization memos, Washington and Oregon amending the code themselves, how "prohibited by the NEC" migrated quietly into carrier underwriting, and why the cheapest part of the system is the only one that never wore out. ⏱ Chapters: 00:00 A nail driven in 1912 2:57 Written by insurance men 7:44 What we did to it afterward 10:00 Fifteen words in Atlanta 13:17 The evidence nobody could find 14:39 The memo that banned it anyway 18:41 How it reached your mailbox 23:00 The only part that didn't wear out 📚 Sources: • Jeffrey R. Gordon and William B. Rose, "Retrofitting Knob and Tube Wiring: An Investigation into Codes, Assessment, Wiring Practices and Cost," Building Research Council, School of Architecture, University of Illinois, June 2000 https://basc.pnnl.gov/library/retrofi... • NFPA, National Electrical Code — Article 324-4, 1987 and 1990 editions; renumbered to Article 394 in the 2002 reorganization • US Department of Energy, Weatherization Assistance Program memoranda, 1983–1988 — collected in NASCSP/WAPTAC electrical issues resources https://nascsp.org/wap/waptac/wap-res... • California Real Estate Inspection Association — knob and tube technical bulletin https://www.creia.org/assets/docs/kno... • InspectAPedia — Knob and Tube Electrical Wiring Safety https://inspectapedia.com/electric/Kn... • US Census Bureau, American Community Survey — housing units by year built • Consumer Product Safety Commission — residential electrical distribution system fire estimates, 1980–1985 • Washington State and Oregon amendments to NEC 324-4, 1990 ⚠️ Disclaimer: The Code Panel 7 record covered here — the 1986 proposal, the dissent, Larry Seekon's public comment, the ten-to-one vote and the later interviews with UL and NFPA staff — is drawn from the University of Illinois investigation's review of NFPA code-making documents, cited above. No federal agency counts how many homes still have live knob-and-tube; the one-to-three- million range is estimate, not measurement, and the CPSC fire figures do not break out wiring method. Rewiring costs vary enormously by house. Most importantly: this video is history and code analysis, not electrical or insurance advice, and nothing in it should be taken as clearance to leave wiring unexamined. Deteriorated insulation, overfusing, improper splices and physical damage are real hazards — have any pre-1940 system assessed by a licensed electrician. Subscribe if you want the documents pulled and read instead of the usual repeated line. And in the comments — has an insurer ever flagged knob-and-tube on your house, or on one you tried to buy? Tell me what they said and what it cost you. knob and tube wiring, old house wiring, home insurance denied, whole house rewire, National Electrical Code, 1987 NEC, knob and tube insurance, pre-1940 homes, electrical safety, home inspection #KnobAndTube #OldHouse #HomeInsurance #Electrical #ElectricalSafety #HomeRenovation #HistoricHomes #HomeInspection #Rewiring #NEC