# US 9,520,705 B2 · Lightning protection for spaced electrical bundles > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,520,705 B2 - Document ID: US9520705B2 - Status: Granted - Kind: B2 - Application number: 14/136,918 - Filed: 2013-12-20 - Published: 2014-04-17 - Granted: 2016-12-13 - Earliest claimed: 2012-09-04 - Assignees: The Boeing Company - Applicants: The Boeing Company - Inventors: Phillip S. Trifeletti; John Kemp Erdelyan; Michael C. Dosch - Web page: https://patentgrep.com/patent/US9520705B2 ## CPC - H02G 13/40: {Connection to earth} - B64D 45/02: Lightning protectors; Static dischargers - H01R 43/20: for assembling or disassembling contact members with insulating base, case or sleeve - B64D 2221/00: Electric power distribution systems onboard aircraft - Y10T 29/49117: Conductor or circuit manufacturing - H02G: INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES - B64D: EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT - H01R: ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A shielded power feeder system may include at least one unshielded power feeder conductor, and at least one grounded guard wire conductor positioned adjacent to the at least one unshielded power feeder conductor, the at least one unshielded power feeder conductor and the at least one grounded guard wire forming a bundle. ## Claims ### Claim 1 A power feeder system shielded for protection from electromagnetic interference, the system comprising: a bundle, the bundle including a plurality of unshielded power feeder conductors; and a plurality of grounded guard wire conductors, each of the plurality of grounded guard wire conductors being grounded at both ends, ones of the plurality of the grounded guard wire conductors spaced individually about the bundle and positioned adjacent and on both sides of each one of the plurality of the unshielded power feeder conductors, wherein each one of the plurality of the unshielded power feeder conductors is adjacent two different ones of the plurality of grounded guard wire conductors, so that during electromagnetic interference, the plurality of grounded guard wire conductors set up differential mode current paths that generate opposite electromagnetic fields that cancel a field from the electromagnetic interference. ### Claim 2 (depends on 1) The shielded power feeder system of claim 1, wherein the plurality of grounded guard wire conductors spaced about the bundle are spaced about a periphery of the bundle. ### Claim 3 (depends on 1) The shielded power feeder system of claim 1, wherein the plurality of unshielded power feeder conductors includes three unshielded power feeder conductors, and ones of the plurality of grounded guard wire conductors are positioned on both sides of each of the three unshielded power feeder conductors. ### Claim 4 (depends on 3) The shielded power feeder conductor of claim 3, further comprising at least one spacer shaped to receive and hold the three power feeder conductors in a fixed, spaced relation to each other. ### Claim 5 (depends on 4) The shielded power feeder conductor of claim 4, wherein the spacer is shaped to receive and hold the grounded guard wire conductors in a fixed, spaced relation to each other about the periphery of the bundle. ### Claim 6 (depends on 5) The shielded power feeder conductor of claim 5, wherein the spacer includes a first plurality of rounded notches having constricted openings formed in an outer periphery, the first plurality of rounded notches shaped to receive and hold the three power feeder conductors in a fixed, spaced relation to each other about the periphery of the bundle. ### Claim 7 (depends on 6) The shielded power feeder conductor of claim 6, wherein the spacer includes a second plurality of rounded notches having constricted openings formed in the outer periphery, the second plurality of rounded notches shaped to receive and hold the ones of the grounded guard wire conductors in a fixed, spaced relation to each other about the periphery of the bundle. ### Claim 8 (depends on 7) The shielded power feeder conductor of claim 7, wherein the first plurality of rounded notches and the second plurality of rounded notches are spaced evenly about the periphery relative to each other. ### Claim 9 (depends on 8) The shielded power feeder conductor of claim 8, wherein the rounded notches of the first plurality of rounded notches and the rounded notches of the second plurality of rounded notches are spaced about 40° apart from each other about the periphery of the spacer. ### Claim 10 (depends on 5) The shielded power feeder conductor of claim 5, further comprising a shielded neutral conductor positioned adjacent at least one of the power feeder conductors at within the periphery of the bundle; and with the spacer including an opening shaped to enclose the neutral conductor. ### Claim 11 (depends on 10) The shielded power feeder conductor of claim 10, wherein the neutral conductor is positioned in a center of the bundle. ### Claim 12 (depends on 11) The shielded power feeder conductor of claim 11, wherein the spacer includes a central opening shaped to receive the neutral conductor. ### Claim 13 (depends on 12) The shielded power feeder conductor of claim 12, wherein the neutral conductor is spaced from the three unshielded power feeder conductors. ### Claim 14 (depends on 13) The shielded power feeder conductor of claim 13, wherein the three unshielded power feeder conductors are spaced evenly about the neutral conductor. ### Claim 15 An aircraft, comprising: a power feeder system shielded for protection from electromagnetic interference, the system forming a bundle, the bundle including a plurality of unshielded power feeder conductors; and a plurality of grounded guard wire conductors, each of the plurality of grounded guard wire conductors being grounded at both ends, ones of the plurality of grounded guard wire conductors positioned on both sides of each one of the plurality of unshielded power feeder conductors, wherein each one of the plurality of the unshielded power feeder conductors is adjacent two different ones of the plurality of grounded guard wire conductors, so that during the electromagnetic interference, the plurality of grounded guard wire conductors set up differential mode current paths that generate opposite electromagnetic fields that cancel a field from the electromagnetic interference. ### Claim 16 (depends on 15) The aircraft of claim 15, further comprising a spacer having a first plurality of rounded notches with restricted openings, the rounded notches of the first plurality of rounded notches shaped to receive and retain the plurality of power feeder conductors therein; and a second plurality of rounded notches with restricted openings, the rounded notches of the second plurality of rounded notches shaped to receive and retain the plurality of grounded guard wires therein; the notches of the first plurality of notches and the second plurality of notches spaced evenly about a periphery of the spacer. ### Claim 17 A method for forming a power feeder system shielded for protection from electromagnetic interference, the shielded power feeder conductor forming a bundle, the method comprising: positioning a plurality of unshielded power feeder conductors in a spaced-apart relation; positioning a plurality of grounded guard wire conductors in a spaced-apart relation, and grounding each of the plurality of grounded guard wire conductors at both ends; positioning ones of the plurality of grounded guard wire conductors adjacent each of the plurality of unshielded power feeder conductors in a spaced-apart relation about the periphery of the bundle and on both sides of each of the plurality of unshielded power feeder conductors, wherein each one of the plurality of the unshielded power feeder conductors is adjacent two different ones of the plurality of grounded guard wire conductors, so that during the electromagnetic interference, the plurality of grounded guard wire conductors set up differential mode current paths that generate opposite electromagnetic fields that cancel a field from the electromagnetic interference; and forming the bundle of the plurality of power feeder conductors and the plurality of grounded guard wire conductors by fixing the spacing between the plurality of power feeder conductors and the plurality of grounded guard wire conductors. ### Claim 18 (depends on 1) The shielded power feeder system of claim 1, wherein each of the grounded guard wire conductors is spaced from its adjacent power feeder conductor. ### Claim 19 (depends on 15) The aircraft of claim 15, wherein each of the grounded guard wire conductors is spaced from its adjacent power feeder conductor.