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ສາຍໄຟຟ້າຕົກຢູ່ໃນເຮືອນ, ຫລັງຄາ, ຫຼືຮົ້ວໂລຫະຂອງທ່ານ

ຕົວເລກສຸກເສີນແຕກຕ່າງກັນໄປຕາມປະເທດ. ຫນ້ານີ້ໃຊ້ 911, ຕົວເລກສໍາລັບສະຫະລັດແລະການາດາ. ປະເທດອື່ນໆຈໍານວນຫຼາຍໃຊ້ 112, 999, ຫຼືຕົວເລກອື່ນ. ຊອກຫາຕົວເລກສໍາລັບປະເທດຂອງທ່ານ.

ເມື່ອມີລົມພະຍຸຮ້າຍແຮງ, ການສະສົມກ້ອນ, ຕົ້ນໄມ້ລົ້ມ, ຫຼືການລະເບີດຂອງໝໍ້ແປງໄຟໄດ້ດຶງສາຍໄຟຟ້າເທິງຫົວແລ້ວຖິ້ມໃສ່ຫຼັງຄາເຮືອນ, ທໍ່ນໍ້າຝົນ, ຝາອາລູມິນຽມ, ຫຼືຮົ້ວເຊື່ອມຕໍ່ລະບົບຕ່ອງໂສ້ຫຼັງເຮືອນ, ຊັບສິນຂອງເຈົ້າຈະກາຍເປັນສ່ວນໜຶ່ງຂອງວົງຈອນໄຟຟ້າແຮງສູງທີ່ມີພະລັງກັບແຜ່ນດິນໂລກ. ບໍ່ເຫມືອນກັບສາຍໄຟພາຍໃນເຮືອນ, ເຊິ່ງເຮັດວຽກຢູ່ທີ່ 120/240 volts (ຫຼື 230 volts ໃນເອີຣົບ) ແລະການເດີນທາງ breaker ວົງຈອນພາຍໃນ milliseconds ຂອງວົງຈອນສັ້ນ, ສາຍ utility ເທິງຫົວມີລະຫວ່າງ 240 volts (ຫຼຸດລົງການບໍລິການ) ແລະ ** 4,000 ຫາ 34,500 volts) feeders (ຕົ້ນຕໍ*. ຮ້າຍແຮງໄປກວ່ານັ້ນ, ເຄື່ອງຕັດວົງຈອນຂອງສະຖານີໄຟຟ້າຍ່ອຍ (ເອີ້ນວ່າ ຕົວເກັບຄືນອັດຕະໂນມັດ) ແມ່ນໂຄງການສະເພາະເພື່ອ ** ຕື່ມພະລັງງານຄືນໃໝ່ໂດຍອັດຕະໂນມັດສອງຫາສີ່ເທື່ອ** ໃນໄລຍະຫຼາຍວິນາທີ ຫຼືນາທີເພື່ອຈູດຮອຍແຕກຂອງກິ່ງງ່າໄມ້ຊົ່ວຄາວ.

ເນື່ອງຈາກແຜ່ນຫລັງຄາຢາງປູຢາງແຫ້ງ, rafters ໄມ້, ດິນ, ແລະຄອນກີດມີຄວາມຕ້ານທານໄຟຟ້າສູງ, ສາຍກະຈາຍຕົ້ນຕໍ 13,800 volt ທີ່ພັກຜ່ອນຢ່າງງຽບໆຢູ່ເທິງຫລັງຄາຫຼືຮົ້ວສວນຫລັງເຮືອນຂອງທ່ານມັກຈະບໍ່ດຶງກະແສໄຟຟ້າທີ່ມີຄວາມຜິດພຽງພໍເພື່ອເຮັດໃຫ້ຟິວຂອງເສົາໄຟຟ້າ. ດັ່ງນັ້ນ, ສາຍໄຟຍັງຄົງຖືກພະລັງງານຢ່າງງຽບໆດ້ວຍແຮງດັນໄຟຟ້າທີ່ຕາຍແລ້ວ ໃນຂະນະທີ່ກໍາລັງໃສ່ທໍ່ນໍ້າຝົນໂລຫະ, ທໍ່ທອງແດງ, ດ້ານອາລູມີນຽມ, ແລະ 100+ ແມັດ (330+ ຟຸດ) ຂອງຮົ້ວສາຍຕ່ອງໂສ້ເຊື່ອມຕໍ່ກັນລະຫວ່າງບ້ານ, ໃນຂະນະທີ່ລັງສີວົງແຫວນຂອງແຮງດັນ (** ທ່າແຮງກ້າວ**) ຜ່ານພື້ນທີ່ອ້ອມຂ້າງ. ຄູ່ມືທີ່ສົມບູນແບບນີ້ກວມເອົາທີ່ພັກອາໄສໃນທັນທີທຽບກັບການຕັດສິນໃຈຍົກຍ້າຍ, ກົນໄກການໄຟ backfeed ສາຍທີ່ເປັນກາງ, ການສໍາຜັດກັບຮົ້ວໂລຫະທີ່ອາດຈະຕາຍ, ແລະເຕັກນິກການຍົກຍ້າຍ shuffling-ຕີນ.

ເຮັດອັນນີ້ດຽວນີ້

ຖ້າສາຍໄຟ, ໝໍ້ແປງໄຟ, ຫຼືເສົາໄຟຟ້າທີ່ຫຼົ່ນລົງ, ດຶງອອກແລ້ວຕົກລົງໃສ່ຫຼັງຄາເຮືອນ, ຂ້າງທາງ, ທາງຍ່າງ, ຫຼືຮົ້ວເດີ່ນ, ໃຫ້ປະຕິບັດຫົກຂັ້ນຕອນເຫຼົ່ານີ້ທັນທີ:

  1. ** ຮັກສາສາຍໄຟທີ່ຕົກທຸກອັນຄືມີຊີວິດ ແລະ ຕາຍ, ເຖິງແມ່ນວ່າຈະບໍ່ຕິດໄຟ**: ຢ່າຄິດວ່າສາຍທີ່ຕົກເປັນສາຍໂທລະສັບທີ່ບໍ່ເປັນອັນຕະລາຍ, ເສັ້ນໄຍແກ້ວ ຫຼື ສາຍເຄເບີນທີວີ, ແລະ ຢ່າຄິດວ່າສາຍໄຟທີ່ງຽບແລ້ວແມ່ນຕາຍ. ເຄື່ອງເກັບກູ້ອຸປະກອນອັດຕະໂນມັດສາມາດສົ່ງໄຟ 13,800 volts ກັບຄືນສູ່ສາຍທີ່ງຽບໂດຍບໍ່ມີການເຕືອນ.
  2. **ຢູ່ພາຍໃນເຮືອນຂອງທ່ານ ເວັ້ນເສຍແຕ່ວ່າໂຄງສ້າງຈະເກີດໄຟໄໝ້ **: ຖ້າສາຍໄຟຟ້າຕັ້ງຢູ່ເທິງຫຼັງຄາ, ລະບຽງ ຫຼືທາງຍ່າງ ແລະບໍ່ມີຄວັນໄຟ ຫຼືໄຟຢູ່ໃນເຮືອນ, ໃຫ້ຢູ່ໃນເຮືອນ ຫ່າງຈາກຝາພາຍນອກ. ການຍ່າງອອກຈາກປະຕູທາງຫນ້າຂອງທ່ານໄປສູ່ຂັ້ນໄດຊີມັງທີ່ປຽກຊຸ່ມຫຼືຫຍ້າປຽກເຮັດໃຫ້ເຈົ້າເຂົ້າໄປໃນເຂດ gradient ແຮງດັນໄຟຟ້າໂດຍກົງແລະພາຍໃຕ້ທໍ່ຝົນທີ່ມີພະລັງງານ.
  3. ** ໂທຫາ 911 / 112 / 999 ແລະສົ່ງເຄື່ອງສຸກເສີນຂອງເຄື່ອງໃຊ້ໄຟຟ້າຂອງເຈົ້າທັນທີ *: ໂທຫາທ້ອງຖິ່ນຂອງເຈົ້າ ຕົວເລກສຸກເສີນ (911 ໃນສະຫະລັດແລະການາດາ, 112 ໃນທົ່ວສະຫະພາບເອີຣົບ, 999 ໃນສະຫະລາຊະອານາຈັກ) ແລະລາຍງານ * "ສາຍໄຟຟ້າທີ່ຫຼຸດລົງແມ່ນໄດ້ພັກຜ່ອນໂດຍກົງກັບເຮືອນ / ຮົ້ວຂອງຂ້ອຍ." ທັນທີຫຼັງຈາກນັ້ນ, ໃຫ້ໂທຫາສາຍດ່ວນສຸກເສີນ 24 ຊົ່ວໂມງຂອງອຸປະກອນໄຟຟ້າຂອງເຈົ້າເພື່ອໃຫ້ສູນຄວບຄຸມຕາຂ່າຍໄຟຟ້າຂອງພວກມັນສາມາດ de-energize ແລະສາຍສາຍ feeder ໄດ້.
  4. ຢ່າແຕະຕ້ອງແຜງເບຣກເກີໄຟຟ້າຫຼັກ, ທໍ່ນ້ຳ, ຫຼືເຄື່ອງໃຊ້ໂລຫະ ຖ້າລົດເສຍຄ່າບໍລິການ: ຖ້າສາຍໄຟຟ້າແຮງສູງຂັ້ນຕົ້ນຕົກລົງມາໃສ່ໃນເຮືອນທີ່ມີແຮງດັນຕໍ່າ, ຫຼືສາຍໄຟກາງຖືກຕັດ, ປະຕູກ່ອງເບຣກເກີໂລຫະ, ທໍ່ນ້ຳທອງແດງ, ແລະເຄື່ອງໃຊ້ໄຟຟ້າທີ່ມີແຮງດັນຫຼາຍຮ້ອຍ ຫຼືຫຼາຍພັນແຮງດັນ. ຢູ່​ຫ່າງ​ຈາກ​ກະ​ດານ​ໄຟ​ຟ້າ, ອ່າງ​ຫລົ້ມ​ຈົມ, ແລະ​ຂອບ​ປະຕູ​ໂລ​ຫະ.
  5. ** ຢູ່ຫ່າງຢ່າງໜ້ອຍ 10 ຫາ 15 ແມັດ (35 ຫາ 50 ຟຸດ) ຫ່າງຈາກຮົ້ວ, ຕົ້ນໄມ້, ຫຼື ໜອງ ແຕະເສັ້ນທີ່ລົ້ມລົງ**: ຖ້າມີສາຍໄຟຕົກລົງຂ້າມຮົ້ວຕ່ອງໂສ້ໂລຫະ, ປະຕູເຫຼັກ, ຮົ້ວລ້ຽງສັດ, ຫຼືກິ່ງງ່າໄມ້ປຽກ, ຄວາມຍາວຢ່າງຕໍ່ເນື່ອງຂອງຮົ້ວນັ້ນຈະຖືກພະລັງງານໄຟຟ້າແຮງດັນໄຟຟ້າແຮງ, ເຖິງແມ່ນວ່າເຮືອນສາມຄົນ.
  6. ** ຖ້າຫລັງຄາເກີດໄຟໄໝ້ ແລະ ເຈົ້າຕ້ອງອົບພະຍົບ, ຢຽບ ຫຼື ໂດດດ້ວຍຕີນທັງສອງເບື້ອງ**: ຖ້າມີຄວັນໄຟ, ຮອຍແຕກ, ຫຼືແປວໄຟໄດ້ບັງຄັບເຈົ້າໃຫ້ຍົກຍ້າຍອອກຈາກເຮືອນໃນຂະນະທີ່ມີສາຍລົງມາເທິງຊັບສິນ, ອອກໄປທາງປະຕູເຮືອນ ** ດ້ານກົງກັນຂ້າມຂອງເຮືອນ ** ຈາກສາຍ, ຫ້າມແຕະ rails ໂລຫະຫຼືປະຕູພະຍຸ, ແລະຕີນຂອງທ່ານ ** ຢ່າງຫນ້ອຍ 5 ແມັດ. (50 ຟຸດ) ຫ່າງ.

ຢ່າພະຍາຍາມຍ້າຍສາຍທີ່ຕົກຄ້າງດ້ວຍໄມ້ແຂວນໄມ້, ທໍ່ PVC, ຫຼືສາຂາແຫ້ງ

ນິທານທີ່ຕາຍແລ້ວອ້າງວ່າເຈົ້າສາມາດຍູ້ສາຍໄຟຟ້າທີ່ລົ້ມລົງຈາກຫຼັງຄາ, ລົດ, ຫຼືຮົ້ວຂອງເຈົ້າໄດ້ຢ່າງປອດໄພໂດຍໃຊ້ໄມ້ຈັບດອກແຂມແຫ້ງ, ເສົາໄຟເບີແກ້ວ, ຫຼືໄມ້ຄ້ອນພາດສະຕິກ. ຢູ່ທີ່ແຮງດັນການແຜ່ກະຈາຍຂັ້ນຕົ້ນຂອງ 7,200 ຫາ 34,500 ໂວນ, ໄມ້ທຳມະດາ, ພາດສະຕິກ ແລະ ຂີ້ຝຸ່ນພື້ນຜິວຈະນໍາກະແສໄຟຟ້າໄດ້ຢ່າງສະດວກ, ໂດຍສະເພາະຖ້າມີແມ້ແຕ່ຄວາມຊຸ່ມຊື່ນຂອງກ້ອງຈຸລະທັດ ຫຼື ມີນ້ໍາ. ແຮງດັນສູງຈະກະພິບລົງທາງນອກຂອງໄມ້ແຂວນໄມ້ ຫຼືແຂນຂາຂອງຕົ້ນໄມ້ ແລະຕັດໄຟຟ້າທ່ານທັນທີ. ມີພຽງແຕ່ຜູ້ຮັບໃຊ້ທີ່ໃສ່ຖົງມືຢາງ dielectric ລະດັບຊັ້ນຮຽນ ແລະໃຊ້ "ໄມ້ຮ້ອນ" ເສັ້ນໃຍແກ້ວທີ່ທົດສອບແລ້ວ 100 ກິໂລໂວນສາມາດສໍາຜັດກັບຕົວນໍາທີ່ຫຼຸດລົງ.


ຕົ້ນໄມ້ການຕັດສິນໃຈມີສິດເທົ່າທຽມສໍາລັບສາຍໄຟຟ້າຫຼຸດລົງໃນເຮືອນຫຼືຮົ້ວ

ໃຊ້ຕົ້ນໄມ້ການຕັດສິນໃຈປະຕິບັດການນີ້ເພື່ອກໍານົດພາຍໃນວິນາທີວ່າຈະພັກອາໄສພາຍໃນເຮືອນຂອງເຈົ້າຫຼືປະຕິບັດການຍົກຍ້າຍພື້ນດິນສຸກເສີນ.

flowchart TD
    Start["ສາຍອຸປະໂພກຕ່າງໆຕົກຢູ່ເທິງຫຼັງຄາເຮືອນ, ຂ້າງທາງ, ຕົ້ນໄມ້, ຫຼືຮົ້ວເດີ່ນ"] --> Location{"1. Where are you right now?"}

    Location -->|"Outside in the yard or street"| OutDist["Retreat Immediately to 15 Meters (50 Feet) Clear of Wire, Fence, and Puddles"]
    Location -->|"Inside the house"| FireCheck{"2. Do you smell smoke, hear wall arcing, or see fire inside the house?"}

    OutDist --> FenceWarn["Guard Perimeter: Warn Neighbors NOT to Touch Any Connected Metal Fence or Gate"]
    FenceWarn --> CallDispatch["Call 911 / 112 / 999 and Electric Utility Emergency Number"]

    FireCheck -->|"No: House is quiet with no smoke or fire"| ShelterIn["STAY INSIDE: Move to Interior Room Away from Exterior Walls & Windows"]
    FireCheck -->|"Yes: Roof/attic smoking or wall outlets sparking"| EvacPrep["EMERGENCY EVACUATION REQUIRED: Choose Exit Door Furthest from Fallen Wire"]

    ShelterIn --> HandsOffInside["Do NOT Touch Main Breaker Panel, Metal Faucets, Water Pipes, or Plugged-In Appliances"]
    HandsOffInside --> CallDispatch

    EvacPrep --> DoorCheck["Open Door Without Touching Metal Storm Door Frame, Aluminum Siding, or Downspouts"]
    DoorCheck --> JumpShuffle["Hop Clear of Threshold with BOTH Feet Together; Shuffle Feet 15m (50ft) Away"]
    JumpShuffle --> CallDispatch

Anatomy of overhead utility poles: what fell on your house?

Understanding which wire snapped from the utility pole in front of your house helps you report the exact severity of the emergency to fire and utility dispatchers. Utility poles are arranged vertically by voltage, with the highest-voltage wires at the very top and low-voltage communication cables at the bottom.

Pole Level (Top to Bottom) Conductor / Equipment Type Typical Operating Voltage Physical Appearance Immediate Hazard When Fallen on House or Fence
1. Top Crossarm (Highest Wires) Primary Distribution Phase Wires (1 to 3 bare aluminum or copper wires on porcelain/polymer insulators) 4,160V to 34,500V (Most commonly 7,200V to 13,800V phase-to-ground) Bare uninsulated metal wire; mounted on tall ceramic insulators above the transformer EXTREME LETHALITY: Ignites asphalt roofs and wooden rafters instantly; energizes wet soil and metal fences for 15+ meters (50+ feet); arcs through shoes
2. Pole-Mounted Cylinder Step-Down Distribution Transformer ("Pole Pig" metal drum) Steps 7,200V to 13,800V down to 120/240V (US) or 230/400V (EU/UK) Grey painted steel cylinder bolted to pole with porcelain bushings on top If knocked down, spills mineral insulating oil (which can burn fiercely) while live high-voltage primary stinger wires remain attached
3. Secondary Triplex Service Drop (House Feed) Three twisted wires (Two black insulated 120V hot legs wrapped around one bare silver steel-reinforced neutral messenger wire) 120V / 240V AC (North America) or 230V AC (Europe/UK), 200 to 1,000+ Amps available fault current Three-wire braided rope running from pole transformer to the weatherhead mast on your roof Weatherhead insulation rubs through on roof edge, energizing metal gutters and siding; if the bare neutral wire snaps, 240V surges burn up appliances inside the house
4. Lowest Messenger Strand Communications Cables (Fiber-optic, coaxial cable TV, copper telephone) Low voltage (0V to 90V DC ringing voltage) under normal conditions Thick black flat or round jacketed cables strapped to a steel support wire 1.8m (6ft) below power lines ບໍ່​ມີ​ຄວາມ​ປອດ​ໄພ: ໃນ​ໄລ​ຍະ​ພະ​ຍຸ, ສາຍ​ໄຟ​ຕົ້ນ​ຕໍ 13,800V ໄດ້​ຕົກ​ໃສ່​ສາຍ​ໂທ​ລະ​ສັບ/ສາຍ​ເຄ​ເບີນ​ເລື້ອຍໆ, ເຮັດ​ໃຫ້​ສາຍ​ໂທ​ລະ​ພາບ​ສາຍ​ສີ​ດຳ​ມີ​ໄຟ​ຟ້າ​ທີ່ 13,800 ໂວນ
UTILITY POLE HIERARCHY & HOUSE SERVICE DROP ANATOMY:
   [Utility Pole]
      (o)---(o)---(o)  <-- LEVEL 1: Primary Distribution (7,200V to 34,500V - LETHAL)
           |
        [=====]        <-- LEVEL 2: Pole Transformer (Steps down to 120/240V)
           | \
           |  \===(Triplex Service Drop: Two 120V Hots + Bare Neutral)===> [Roof Weatherhead Mast]
           |                                                                       ||
           +------(Black Coax / Fiber / Phone Cable)---------------------> [House Wall Box]

ເປັນ​ຫຍັງ​ສາຍ​ໄຟ​ຟ້າ​ທີ່​ຕົກ​ຢູ່​ໃນ​ເຮືອນ​ຂອງ​ເຈົ້າ​ຈຶ່ງ​ສາມາດ​ຕັ້ງ​ໄຟ​ໄໝ້​ຝາ​ຈາກ​ພາຍ​ໃນ

ເມື່ອມີແຂນຂາຂອງຕົ້ນໄມ້ຕົກລົງໄປທົ່ວຫົວ ການຫຼຸດຄ່າບໍລິການ triplex ແລ່ນລະຫວ່າງເສົາຖະໜົນ ແລະເຫຼັກກ້າຂອງຫຼັງຄາເຮືອນເຈົ້າ ໜ້າດິນຟ້າອາກາດ, ຄວາມຜິດທາງໄຟຟ້າອັນຕະລາຍສາມຢ່າງສາມາດເກີດຂຶ້ນພ້ອມໆກັນພາຍໃນຂອບເຮືອນຂອງເຈົ້າ:

1. ຖານວັດດຶງອອກ ແລະ ທໍ່ນໍ້າຝົນທີ່ມີພະລັງ

ເມື່ອມີແຂນຂາຂອງຕົ້ນໄມ້ທີ່ໜັກໜ່ວງດຶງສາຍເຄເບີນ triplex ເທິງຫົວລົງມາ, ມັນຈີກສາຍທໍ່ເຫຼັກອອກຈາກ eaves ມຸງຂອງເຈົ້າ ແລະດຶງດ້ານນອກ ** ກ່ອງເຕົ້າສຽບແມັດໄຟຟ້າ ** ອອກຈາກຂ້າງເຈົ້າ.

  • ການເສີມສ້າງດ້ານອາລູມີນຽມ ແລະ ທໍ່ນໍ້າຝົນ: ເມື່ອສາຍທາງເຂົ້າບໍລິການທີ່ດຶງອອກມາໄດ້ຂັດກັບຂອບໂລຫະທີ່ແຫຼມຂອງຫົວອາກາດ, ກະພິບຫຼັງຄາໂລຫະ, ຫຼືທໍ່ຝົນອາລູມີນຽມ, ຢາງຢາງສີດຳຈະເປີດອອກ. ເນື່ອງຈາກວ່າຄວາມຜິດນີ້ເກີດຂື້ນ ** ຢູ່ຂ້າງຖະຫນົນຜົນປະໂຫຍດ (ດ້ານເສັ້ນ) ຂອງແຜງຕັດວົງຈອນຕົ້ນຕໍຂອງທ່ານ **, ເບກເກີຫຼັກ 200-amp ຂອງເຮືອນຂອງເຈົ້າ ** ບໍ່ສາມາດເດີນທາງເພື່ອຢຸດມັນ **.
  • ສາຍໄຟ 120/240-volt ເປົ່າຈະປ້ອນແອມໄຟຫຼາຍຮ້ອຍອັນໂດຍກົງໃສ່ທໍ່ຝົນໂລຫະຂອງທ່ານ, ທໍ່ອາລູມິນຽມ downspouts, ແລະຂ້າງໂລຫະ. ຜູ້​ໃດ​ຢືນ​ຢູ່​ເທິງ​ພື້ນ​ດິນ​ທີ່​ຊຸ່ມ​ຢູ່​ຂ້າງ​ນອກ ຜູ້​ທີ່​ແຕະ​ທໍ່​ນ້ຳ​ຕົກ ຫຼື​ປະ​ຕູ​ລົມ​ພະຍຸ​ໂລຫະ​ຈະ​ເຮັດ​ໃຫ້​ວົງ​ຈອນ​ລົງ​ມາ​ສູ່​ໂລກ ແລະ​ຖືກ​ໄຟ​ຟ້າ​ຕາຍ.

2. ອັນຕະລາຍ "Open Service Neutral": ເປັນຫຍັງທໍ່ນ້ຳ ແລະຝາຈຶ່ງເກີດໄຟໄໝ້

ໃນອາເມລິກາເຫນືອ 120 / 240-volt ລະບົບແຍກ (ແລະລະບົບສາຍດິນ TN-C-S / PME ສາກົນຫຼາຍ), ສາຍເຫຼັກເງິນເປົ່າໃນການຫຼຸດລົງການບໍລິການ overhead ຂອງທ່ານແມ່ນທັງສອງ ** ເຊືອກສະຫນັບສະຫນູນທາງດ້ານຮ່າງກາຍ ** ແລະ ** conductor ກັບຄືນເປັນກາງ **.

  • ຈະເກີດຫຍັງຂຶ້ນຖ້າສາຍໄຟກາງເປົ່າສຽບໃນຂະນະທີ່ສາຍໄຟຮ້ອນ 120V ສີດຳສອງສາຍເຊື່ອມຕໍ່ກັນຢູ່:
  • ແຮງດັນຈາກປ່າເກີດຂຶ້ນໃນທັນທີທົ່ວປ້ຳໃນເຮືອນຂອງເຈົ້າ: ເຄິ່ງໜຶ່ງຂອງປ້ຳ 120 ໂວນຂອງເຈົ້າຫຼຸດລົງເປັນ 30 ໂວນ, ໃນຂະນະທີ່ອີກເຄິ່ງໜຶ່ງເກີດແຮງດັນຂຶ້ນເປັນ 200 ຫາ 230 ໂວນ, ເຮັດໃຫ້ເຄື່ອງປ້ອງກັນໄຟໄໝ້, ເຕົາໄມໂຄເວຟ, ໝໍ້ໄຟ, ແລະປ່ຽງໄຟເກີດໄຟໄໝ້ພາຍໃນຫ້ອງ.
  • ** ກະແສໄຟຟ້າກັບຄືນມາບໍ່ສົມດຸນໄຫຼຜ່ານທໍ່ນ້ຳທອງແດງ ແລະສາຍແກ໊ສ**: ດ້ວຍສາຍໄຟກາງຢູ່ເໜືອຫົວແຕກ, ກະແສໄຟຟ້າທັງໝົດທີ່ກັບມາຈາກເຮືອນຂອງເຈົ້າພະຍາຍາມຊອກຫາເສັ້ນທາງກັບຄືນສູ່ໝໍ້ແປງຂົ້ວໂລກໂດຍຜ່ານສາຍໄຟຟ້າທີ່ເຊື່ອມຕໍ່ຫາທໍ່ນ້ຳທອງແດງຂອງເຈົ້າ**. ທໍ່ທໍ່ທອງແດງຂອງເຈົ້າ, ທໍ່ລະບາຍນໍ້າດ້ວຍເຫຼັກກ້າ, ແລະຕົວເຊື່ອມຕໍ່ອາຍແກັສເຫລັກທີ່ມີຄວາມຍືດຫຍຸ່ນສາມາດເຮັດຄວາມຮ້ອນສູງເກີນໄປກັບອຸນຫະພູມທີ່ເຫຼື້ອມໃສ ແລະເຮັດໃຫ້ໄຟຟ້າໃນເຮືອນຄົວ ແລະຫ້ອງນໍ້າ.
  • ** ກະແສໄຟຟ້າທີ່ເປັນກາງຂອງເພື່ອນບ້ານທີ່ໄຫຼຜ່ານທໍ່ນ້ໍາເທດສະບານຂອງທ່ານ **: ເຖິງແມ່ນວ່າເບກເກີຂອງເຈົ້າເອງຈະປິດ, ຖ້າສາຍໄຟກາງຂອງເພື່ອນບ້ານຂອງເຈົ້າໄດ້ຮັບຄວາມເສຍຫາຍ, ກະແສໄຟຟ້າຈາກເຮືອນຂອງພວກເຂົາສາມາດເດີນທາງຜ່ານທໍ່ນ້ໍາໃຕ້ດິນທີ່ມີໂລຫະຮ່ວມກັນເຂົ້າໄປໃນທໍ່ໃຕ້ດິນຂອງເຈົ້າ. ຢ່າແຕະຕ້ອງທໍ່ນ້ຳໂລຫະ, ກ໊ອກນ້ຳໃນອາຄານ, ຫຼືແຜງເບກເກີໄຟຟ້າຫຼັກເມື່ອສາຍໄຟລົດລົງ.

3. ການຕິດຕໍ່ຂ້າມຂັ້ນຕົ້ນຫາມັດທະຍົມ (ການບຸກລຸກແຮງດັນສູງ)

ຖ້າສາຍໄຟຫຼັກ 7,200 ໂວນ ຫຼື 13,800 ໂວນ ຢູ່ດ້ານເທິງຂອງເສົາຖະໜົນໄດ້ງັບລົງ ແລະ ຕົກລົງໄປທົ່ວສາຍໄຟສາຍບໍລິການຂັ້ນສອງ 120/240 ໂວນ ທີ່ກຳລັງລ້ຽງເຮືອນຂອງທ່ານ, ສາຍໄຟຫຼາຍພັນໂວນ ພັດລົງໂດຍກົງໃສ່ໜ້າເສົາໄຟຟ້າໃສ່ກະດານເບກເກີຫຼັກຂອງທ່ານ. ເຄື່ອງຕັດວົງຈອນຂອງຄົວເຮືອນຖືກຈັດອັນດັບພຽງແຕ່ຂັດຂວາງ 240 volts; 7,200 volts ໂດດຊື່ຂ້າມຊ່ອງຫວ່າງ breaker "OFF" ໃນ plasma arc ຢ່າງຕໍ່ເນື່ອງ, ພັດອອກ faceplates ອອກຈາກຝາຫ້ອງນອນແລະ igniting studs ໄມ້ພາຍໃນຢູ່ຕາມໂກນຂອງກໍາແພງ.


ໄຟຟ້າຮົ້ວໂລຫະ: ເປັນຫຍັງລະບົບຕ່ອງໂສ້ການເຊື່ອມຕໍ່ແລະຮົ້ວສາຍເຮັດສໍາລັບຕັນ

ຫນຶ່ງໃນສະຖານະການທີ່ເສຍຊີວິດທີ່ສຸດຫຼັງຈາກພະຍຸລົມ, ພະຍຸເຮີລິເຄນ, ຫຼືພະຍຸນ້ໍາກ້ອນແມ່ນສາຍໄຟຟ້າທີ່ຫຼຸດລົງຢູ່ໃນຮົ້ວເຊື່ອມຕໍ່ ** ຫລັງບ້ານ, ຮົ້ວອ້ອມຮອບດ້ວຍທາດເຫຼັກ, ຫຼືຮົ້ວຮົ້ວເຫຼັກ / ສາຍລວດກະສິກໍາ **.

1. ເປັນຫຍັງຮົ້ວບໍ່ອອກສາຍໄຟຟ້າ

ຕາມທໍາມະຊາດ, ເຈົ້າຂອງເຮືອນຄິດວ່າຍ້ອນວ່າເສົາຮົ້ວເຊື່ອມຕໍ່ລະບົບຕ່ອງໂສ້ເຫຼັກຖືກຕັ້ງຢູ່ໃນຝຸ່ນທຸກໆ 2.4 ຫາ 3 ແມັດ (8 ຫາ 10 ຟຸດ), ສາຍໄຟຟ້າທີ່ຕົກລົງໃສ່ຮົ້ວຈະສັ້ນລົງໃນພື້ນທີ່ທັນທີທັນໃດແລະທໍາລາຍເຄື່ອງຕັດໄຟຟ້າ. ໃນຄວາມເປັນຈິງ:

  • ພື້ນຫລັງທາງຄອນກີດ ແລະດິນຊັ້ນເທິງແຫ້ງ ຫຼືດິນຊາຍ ມີຄວາມຕ້ານທານໄຟຟ້າສູງ (ມັກຈະມີ 50 ຫາ 500 ohms ຕໍ່ຫຼັງ).
  • ສາຍໄຟຟ້າ 7,200 ໂວນທີ່ວາງຢູ່ເທິງລະບົບຕ່ອງໂສ້ເຊື່ອມຕໍ່ເທິງລົດໄຟອາດຈະຍູ້ພຽງແຕ່ 15 ຫາ 40 ແອມພານເຂົ້າໄປໃນດິນ, ຕໍ່າກວ່າເກນ 100 ຫາ 400 ແອມທີ່ຕ້ອງການເພື່ອເດີນທາງກັບຕົວເບກເກີຂອງສະຖານີຍ່ອຍ.
  • ດັ່ງນັ້ນ, ເຄືອຂ່າຍຮົ້ວໂລຫະຢ່າງຕໍ່ເນື່ອງທັງຫມົດ, ມັກຈະກວມເອົາ **5 ຫາ 10 backyards ທີ່ເຊື່ອມຕໍ່ລົງໃນຕັນທີ່ຢູ່ອາໄສທັງຫມົດ , ຍັງຄົງມີພະລັງງານຫຼາຍພັນ volts ສໍາລັບຊົ່ວໂມງ. ເດັກນ້ອຍ, ໝາ, ຫຼືບ້ານໃກ້ເຮືອນຄຽງສາມຫຼັງທີ່ບໍ່ຄິດວ່າມີຕົ້ນໄມ້ລົ້ມລົງຂ້າງທາງສາມາດຍ່າງເຂົ້າໄປໃນສວນຫລັງບ້ານຂອງຕົນເອງ, ຈັບສາຍປະຕູຮົ້ວຂອງລະບົບຕ່ອງໂສ້, ແລະຖືກໄຟຟ້າທັນທີເພາະວ່າເກີບທີ່ປຽກຊຸ່ມແລະຮ່າງກາຍຂອງພວກເຂົາເຮັດໃຫ້ມີເສັ້ນທາງຕ້ານທານກັບແຜ່ນດິນໂລກທີ່ຊຸ່ມຊື່ນຕ່ໍາ ( ທ່າແຮງການສໍາພັດ **).

2. ທ່າແຮງຂັ້ນຕອນທຽບກັບທ່າແຮງການສໍາພັດອະທິບາຍ

ເມື່ອມີແຮງດັນສູງໄຫຼຈາກສາຍທີ່ລົ້ມລົງ ຫຼືເສົາຮົ້ວທີ່ມີພະລັງລົງສູ່ແຜ່ນດິນໂລກ, ກະແສໄຟຟ້າຈະແຜ່ອອກໄປທາງນອກຜ່ານດິນເປັນວົງກົມ, ຄືກັບການສັ່ນສະເທືອນຈາກກ້ອນຫີນທີ່ຕົກຢູ່ໃນໜອງ. ແຮງດັນແມ່ນສູງສຸດທີ່ຈຸດທີ່ແນ່ນອນຂອງການຕິດຕໍ່ແລະຫຼຸດລົງກັບທຸກໆແມັດຂອງໄລຍະຫ່າງ.

ອັນຕະລາຍຈາກໄຟຟ້າ ກົນໄກທາງກາຍະພາບ How a Person Gets Electrocuted How to Prevent Injury
Step Potential (Foot-to-Foot Voltage Difference) Concentric rings of decreasing voltage radiate across the ground surface up to 10 to 15 meters (35 to 50 feet) away from the downed wire or fence post Walking with a normal 0.8-meter (2.5-foot) stride places your front foot on a 5,000-volt soil ring and your back foot on a 3,000-volt soil ring; the 2,000-volt difference shoots up one leg, through your pelvic/abdominal organs, and down the other leg Never walk or run with normal strides inside the 15-meter (50-foot) zone; shuffle both feet together so both soles stay at the exact same voltage
Touch Potential (Hand-to-Foot Voltage Difference) A metal fence, gutter downspout, or car body is energized at full line voltage (e.g., 7,200V) while the ground 1 meter away is at a lower voltage (e.g., 2,000V) Standing on the ground and touching a metal fence gate, downspout, or car door sends 5,200 volts directly from your hand through your heart to your feet Keep hands completely away from any metal fence, gate, railing, downspout, or vehicle anywhere near a downed utility wire
Touch-Step Combination Reaching out to steady yourself against a wall, tree, or fence while stepping across energized ground Creates simultaneous hand-to-foot and foot-to-foot current paths directly across the chest cavity Tuck arms against your chest while shuffling or hopping clear of the hazard zone
CONCENTRIC VOLTAGE RINGS (STEP POTENTIAL) AROUND A DOWNED LINE OR FENCE POST:
          [Downed 7,200V Wire on Ground / Fence Post]
                          ||
               ( ( (   7,200 V   ) ) )
            ( ( (      5,000 V      ) ) )
         ( ( (         3,000 V         ) ) )
      ( ( (            1,000 V            ) ) )
                        [Foot A]  [Foot B] <-- Normal stride bridges 3,000V to 1,000V = LETHAL
                        [FootA+B]          <-- Shuffling feet together keeps voltage difference = 0V

How to evacuate a house safely if a downed power line starts a roof or wall fire

As long as your house is free of smoke, sparks, and fire, stay inside in an interior room until utility linemen confirm the line is de-energized and grounded. However, if a downed wire on your roof or siding ignites the attic rafters or wall studs and you smell smoke or hear crackling fire inside the house, you must evacuate immediately without getting electrocuted at the doorway:

  1. Choose an exit door on the side of the house OPPOSITE the fallen wire: Look out the windows before opening any door. Never exit underneath the roof eave where the wire is hanging, and avoid driveways or patios that have puddles of water touching the foundation.
  2. Check the doorframe and avoid touching metal trim: If you have a wood or fiberglass door leading onto a dry wooden porch or concrete step on the far side of the house, open the door using only the interior handle. Do not grab an aluminum storm door frame, metal screen door mesh, or metal porch handrail.
  3. Hop clear of the doorway threshold with BOTH feet together: If you suspect the house siding, metal threshold sill, or porch railing is energized, do not step out with one foot inside the house and one foot on the ground outside (which bridges the house's voltage potential to the earth). Stand on the interior floor, tuck your arms against your chest, and hop with both feet pressed tightly together so you land on the ground outside with both feet simultaneously without touching the doorframe.
  4. Execute the two-foot shuffle to 15 meters (50 feet):
  5. Once outside on the ground, keep your feet pressed together side-by-side so your ankles touch.
  6. Slide one foot forward no more than 5 to 8 centimeters (2 to 3 inches) along the ground without lifting your sole off the earth, then slide the other foot up to meet it, keeping both feet in continuous contact with each other and the ground.
  7. Alternatively, hop like a bunny with both feet locked tightly together so only one point of ground contact exists at any instant.
  8. Continue shuffling or hopping until you are at least 15 meters (50 feet) away from the house, the downed wire, any metal fences, and any wet ground.

Solar panels, backup generators, and post-storm electrical reconnection

Before power can be restored after a utility line falls on your house, two additional electrical hazards must be managed: rooftop solar photovoltaic (PV) arrays and portable backup generators.

1. Rooftop solar panels remain live in daylight even when the grid is down

If a falling tree limb or utility line crashes onto a roof equipped with solar photovoltaic (PV) panels:

  • Even when the utility grid fails and your solar inverter automatically shuts down anti-islanding export (Rapid Shutdown), the individual solar glass modules and DC string wiring on the roof continue generating 30 to 600 volts of direct current (DC) whenever sunlight or bright daylight hits the cracked glass.
  • Water from rain or fire hoses contacting shattered solar panels creates an immediate DC arc-fault fire and energizes metal roof racking and rain gutters. Report rooftop solar panels immediately to arriving firefighters.

2. Never backfeed a portable generator into a damaged house system

After a storm rips down your overhead service drop, never plug a portable gasoline generator into a dryer outlet or flip a generator transfer switch ON until an electrician verifies your overhead service mast is completely disconnected from the downed street wires:

  • If your generator backfeeds power into a damaged meter box or snapped service drop lying in your yard, the utility pole transformer steps your generator's 240-volt output backward up to 7,200 or 13,800 volts, energizing the downed wire in your yard and electrocuting utility linemen or neighbors.
  • If your house's service neutral or grounding electrode wire was ripped loose when the mast fell, running a generator bonded through the panel can energize your home's metal appliances and plumbing. Only run portable generators outdoors at least 6 meters (20 feet) from windows using heavy-duty extension cords plugged directly into individual appliances.

3. Underground service laterals, pad-mounted transformers, and energized ground faults

Even in modern neighborhoods with no overhead utility poles, severe electrical hazards occur when floodwaters, uprooted tree roots, or digging equipment breach an underground service lateral or a green steel pad-mounted transformer box on your front lawn:

  • Never touch or sit on a green pad-mounted transformer cabinet: The green steel box in a residential yard steps 7,200- to 13,800-volt underground primary cables down to 120/240 volts. If a vehicle strikes the box, floodwater submerges it, or internal mineral oil overheats, stay at least 10 to 15 meters (35 to 50 feet) away and shuffle out of the area if the ground is wet.
  • Melting snow circles and steaming soil: If an underground service cable shorts out beneath your lawn or driveway after tree root movement, the high-resistance earth fault heats the soil, causing a circular patch of snow to melt rapidly, steam to rise from the grass, or a distinct acrid smell of burning rubber insulation. Keep people and pets completely off that lawn section and call your electric utility immediately.

First aid and rescue rules if someone is shocked outside

If you look out your window or arrive home and see a person or pet lying unconscious near a downed wire, a metal fence, or a gutter downspout:

  1. STOP and do not run over to grab them: If the person is lying on energized ground or still touching an energized chain-link fence, running up to touch them will immediately kill you via step potential or touch potential.
  2. Call 911 / 112 / 999 immediately: Tell the dispatcher a person has been electrocuted by a downed utility line and the line is still live.
  3. Only approach once utility crews confirm the grid is de-energized, or if the victim is clearly outside the high-voltage zone: Once the scene is confirmed electrically safe by emergency responders, check the victim for responsiveness and normal breathing. High-voltage alternating current causes immediate ventricular fibrillation (chaotic heart quivering) or respiratory paralysis. Begin Hands-Only CPR (100 to 120 chest compressions per minute, 5 to 6 centimeters / 2 to 2.4 inches deep) and apply an Automated External Defibrillator (AED) as soon as one is available.

Taking a hands-on first aid and CPR course from the Red Cross, St John Ambulance, or a local accredited provider prepares you to perform life-saving resuscitation and treat high-voltage entry and exit burns once emergency crews make the scene safe.


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If a power line falls on my roof during a storm, should I run outside or stay inside the house?

Unless your house is actively smoking or on fire, you should stay inside the house in an interior room away from exterior walls, windows, plumbing, and the electrical breaker box. Staying indoors protects you from stepping onto energized wet ground outside (step potential) or brushing against electrified metal rain gutters and siding; only evacuate if the wire ignites a structure fire inside the house.

Why can't I go down to my basement and flip my main circuit breaker off when a line falls on my house?

When an overhead utility line falls on your roof or pulls your exterior electric meter mast loose, the electrical fault occurs on the utility street side of your main breaker, meaning flipping your breaker off will not stop the electricity outside. Worse still, if a high-voltage primary wire (7,200 to 13,800 volts) fell onto your service drop or snapped your neutral wire, the metal door of your breaker box can be energized at lethal voltage.

How far can electricity travel down a metal chain-link or wire fence if a power line falls on it?

A live distribution power line resting on a chain-link, wrought-iron, or barbed-wire fence can energize the entire continuous length of connected metal fencing for 100 meters (330 feet) or more, spanning multiple neighbors' backyards down an entire block. Never touch any metal fence, gate latch, or post anywhere on your block if an overhead wire is down nearby.

What is "step potential" and why do I have to shuffle my feet near a downed power line?

When a live power line touches the earth, electricity radiates outward through the soil in concentric rings of decreasing voltage, like ripples in a pond. If you walk with a normal stride, your front foot may step on a 4,000-volt soil ring while your back foot is on a 2,000-volt ring; that 2,000-volt difference ("step potential") shoots up one leg and down the other, electrocuting you. Shuffling with both feet pressed together keeps both feet at the exact same voltage so current will not flow through your legs.

Can I tell if a fallen wire in my yard is just a harmless cable TV or telephone line?

No, you must treat every single fallen overhead wire as a lethal high-voltage power line. Even if a black coaxial cable TV or telephone wire normally carries low voltage, storm winds and falling trees up the street routinely snap 13,800-volt primary power lines down onto the lower communication cables, energizing the telephone or cable TV wire at 13,800 volts.

Who pays to repair the weatherhead mast and meter box on my house after a tree pulls the power line down?

In most jurisdictions, the electric utility company owns and repairs the overhead service drop wires coming from the street pole up to the splice point at your roof, as well as the glass/digital meter itself. However, the homeowner legally owns the steel weatherhead mast, the service entrance cable running down the side of the house, and the metal meter socket box, meaning you must hire a licensed private electrician to reattach or replace a ripped-down mast and meter box before the utility company is legally allowed to reconnect your power.


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  • Occupational Safety and Health Administration (OSHA, United States): Downed Electrical Power Lines Fact Sheet, Step and Touch Potential Physics, and High-Voltage Clearance Standards.
  • Federal Emergency Management Agency (FEMA / Ready.gov, United States): Power Outages and Downed Utility Line Safety After Severe Storms.
  • Electrical Safety Foundation International (ESFI, United States): Downed Power Line Safety, Open Service Neutral Hazards, and Post-Storm Meter Base Inspection Guidelines.
  • Health and Safety Executive (HSE, United Kingdom) and Energy Networks Association (ENA, United Kingdom): Avoidance of Danger from Overhead Electric Lines (GS6) and Public Emergency Guidance for Fallen Conductors.
  • National Fire Protection Association (NFPA, United States): NFPA 70 National Electrical Code (NEC) Service Entrance Grounding Standards and Electrical Fire Response.

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