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ANSI NEMA WC 27500-2025 American National Standard for Aerospace and Industrial Electrical Cable, 2025
- American National Standard for
- Aerospace and Industry Electrical Cable [Go to Page]
- NEMA WC 27500-2025
- Revision of ANSI/NEMA WC 27500-2020
- FSC 6145
- 1 General [Go to Page]
- 1.1 Scope
- 1.2 Referenced Standards
- 1.3 Order of Precedence
- 2 Classification [Go to Page]
- 2.1 General
- 2.2 Cable Designation [Go to Page]
- 2.2.1 Identification Method of Cable Wire (with Shield Coverage)
- 2.2.2 Conductor Size
- 2.2.3 Basic Wire Specification
- 2.2.4 Number of Wires Per Cable
- 2.2.5 Shield Style and Material
- 2.2.6 Jacket Material, Color, and Temperature Rating
- L
- P
- S
- 3 Requirements [Go to Page]
- 3.1 Construction
- 3.2 Wire
- 3.3 Finished Cable
- 3.4 Identification of Cable Wire [Go to Page]
- 3.4.1 Preferred Identification Method
- 3.4.2 Optional Identification Method A
- 3.4.3 Optional Identification Method B
- 3.4.4 Optional Identification Method C
- 3.4.5 Optional Identification Method D
- 3.4.6 Optional Identification Method E
- 3.4.7 Optional Identification Method F
- 3.5 Cable Lay-Up and Direction
- 3.6 Fillers and Binder Tapes
- 3.7 Shield [Go to Page]
- 3.7.1 Round Shield [Go to Page]
- 3.7.1.1 Round Shield Strand Material [Go to Page]
- 3.7.1.1.1 Round Copper Shield Strands
- 3.7.1.1.2 Round Copper Alloy Shield Strands
- 3.7.1.1.3 Stainless Steel Shield Strands
- 3.7.1.2 Round Shield Strand Coating [Go to Page]
- 3.7.1.2.1 Tin-coated Copper Strands
- 3.7.1.2.2 Silver-coated Copper and Copper Alloy Strands
- 3.7.1.2.3 Nickel-coated Copper and Copper Alloy Strands
- 3.7.1.2.4 Nickel-coated Copper 27%
- 3.7.1.3 Round Shield Strand Size [Go to Page]
- 3.7.1.3.1 Round Copper or Copper Alloy Strand Size
- 3.7.1.3.2 Round Stainless-Steel Shield Size
- 3.7.2 Flat Shield [Go to Page]
- 3.7.2.1 Flat Shield Strand Material [Go to Page]
- 3.7.2.1.1 Flat Copper Shield Strands
- 3.7.2.1.2 Flat Copper Alloy Shield Strands
- 3.7.2.2 Flat Shield Strand Coating [Go to Page]
- 3.7.2.2.1 Tin-coated Copper Strands
- 3.7.2.2.2 Silver-coated Copper and Copper Alloy Strands
- 3.7.2.2.3 Nickel-coated Copper and Copper Alloy Strands
- 3.7.2.3 Flat Shield Strand Size
- 3.7.3 Braid Angle
- 3.7.4 Shield Coverage
- 3.7.5 Shield Splices
- 3.8 Jacket [Go to Page]
- 3.8.1 Jacket Requirements [Go to Page]
- 3.8.1.1 Wall Thickness
- 3.8.1.2 Extruded Jacket Concentricity
- 3.8.1.3 Jacket Color
- 3.8.1.4 Strippability
- 3.8.2 Jacket Material [Go to Page]
- 3.8.2.1 Extruded Polyamide
- 3.8.2.2 Polyamide Braid and Polyamide Finishers
- 3.8.2.3 Polyester Fiber Braid with High-temperature Finishers
- 3.8.2.4 Extruded or Taped Polytetrafluoroethylene
- 3.8.2.5 Extruded Polyvinyl Chloride
- 3.8.2.6 Extruded Fluorinated Ethylene Propylene
- 3.8.2.7 Glass Braid with Polytetrafluoroethylene Finishers
- 3.8.2.8 Extruded Crosslinked Polyvinylidene Fluoride
- 3.8.2.9 Polyvinylidene Fluoride
- 3.8.2.10 Taped Polyimide/Fluorinated Ethylene Propylene
- 3.8.2.11 Ethylene-tetrafluoroethylene Copolymer
- 3.8.2.12 Ethylene Chlorotrifluoroethylene Copolymer (Inactive for New Design)
- 3.8.2.13 Extruded Perfluoroalkoxy
- 3.8.2.14 Extruded, Crosslinked, Modified, Ethylene-tetrafluoroethylene
- 3.8.2.15 Taped Polyimide/Polytetrafluoroethylene
- 3.8.2.16 Smooth Surface Taped Polyimide/Polytetrafluoroethylene
- 3.8.2.17 Extruded, White, Controlled-Fluoride, Crosslinked, Modified, Ethylene-tetrafluoroethylene
- 3.8.2.18 Abrasion-resistant, Extruded, White, Crosslinked, Modified, Ethylene-tetrafluoroethylene
- 3.8.2.19 Extruded, White, Low-fluoride, Crosslinked, Modified, Ethylene-tetrafluoroethylene
- 3.8.2.20 Taped, White, Engineered Fluoropolymer
- 3.9 Functional Characteristics [Go to Page]
- 3.9.1 Dielectric Withstand [Go to Page]
- 3.9.1.1 Dielectric Withstand—Component Wire
- 3.9.1.2 Dielectric Withstand—Inner Jacket
- 3.9.1.3 Dielectric Proof Test (for Unshielded-Unjacketed Configuration)
- 3.9.2 Jacket Flaws (Shielded-and-Jacketed Cables Only)
- 3.9.3 Conductor Continuity
- 3.9.4 Cold Bend (Jacketed and Shielded-and-Jacketed Cables Only)
- 3.9.5 Thermal Shock
- 3.9.6 Blocking
- 3.9.7 Flammability
- 3.9.8 Lamination Sealing
- 3.9.9 Crosslinked Verification
- 3.9.10 Shield Solderability
- 3.9.11 Temperature Rating
- 3.9.12 Component Insulation Tensile and Elongation
- 3.9.13 Controlled-fluoride and Low-fluoride Jackets
- 3.9.14 Stripe and Band Durability
- 3.9.15 Smooth Surface Verification
- 3.9.16 Abrasion-resistant Crosslinked ETFE Jackets
- 3.9.17 Needle Abrasion Test for Engineered Fluoropolymer Jackets
- 3.10 Identification of Product [Go to Page]
- 3.10.1 Wire Product Identification
- 3.10.2 Cable Product Identification [Go to Page]
- 3.10.2.1 Unshielded-Unjacketed Cable
- 3.10.2.2 Shielded Cable
- 3.10.2.3 Jacketed Cable (Two to 15 Wires)
- 3.10.2.4 Shielded-and-Jacketed Cable
- 3.10.3 Identification Marker Tape
- 3.11 Cable Diameter
- 3.12 Cable Weight
- 3.13 Continuous Lengths
- 3.14 Workmanship
- 4 Verification [Go to Page]
- 4.1 Classification of Inspection
- 4.2 Conditions of Inspection [Go to Page]
- 4.2.1 Quality Conformance Inspection [Go to Page]
- 4.2.1.1 Lot
- 4.2.1.2 Sample
- 4.2.1.3 Sample Unit
- 4.2.1.4 Specimen
- 4.2.1.5 Sampling
- 4.2.1.6 Resubmitted Inspection Lots
- 4.2.2 Process Control Tests [Go to Page]
- 4.2.2.1 Sampling for Process Control Tests [Go to Page]
- 4.2.2.1.1 Sampling for Shield Material
- 4.2.2.1.2 Basic Wire
- 4.2.3 Disposition of Rejections
- 4.2.4 Qualification Inspection [Go to Page]
- 4.2.4.1 Initial Qualification [Go to Page]
- 4.2.4.1.1 Sample for Qualification Testing
- 4.2.4.1.2 QPL Evaluating Activity
- 4.2.4.1.3 QPL Publication
- 4.2.4.1.4 Qualification by Similarity
- 4.2.4.2 Sampling for Retention of Qualification
- 4.2.4.3 Effects of Failure in Retention of Qualification Inspection
- 4.2.4.4 Retention of Qualification by Certification
- 4.2.4.5 Qualification
- 4.2.5 Certified Test Reports
- 4.3 Methods of Inspection [Go to Page]
- 4.3.1 Inspection of Product [Go to Page]
- 4.3.1.1 Cable Lay-up and Direction
- 4.3.2 Shield Strands [Go to Page]
- 4.3.2.1 Elongation
- 4.3.2.2 Coating [Go to Page]
- 4.3.2.2.1 Thickness
- 4.3.2.2.2 Continuity of Tin, Silver, and Nickel Coating
- 4.3.3 Dielectric Withstand [Go to Page]
- 4.3.3.1 Dielectric Withstand—Component Wires
- 4.3.3.2 Dielectric Withstand—Inner Jacket
- 4.3.3.3 Dielectric Proof Test (for Unshielded-Unjacketed Cable Configuration)
- 4.3.4 Jacket Flaws
- 4.3.5 Braid Angle and Shield Coverage
- 4.3.6 Cold Bend
- 4.3.7 Voltage Withstand, Jacket
- 4.3.8 Conductor Continuity
- 4.3.9 Thermal Shock
- 4.3.10 Crosslinked Verification
- 4.3.11 Bend Test
- 4.3.12 Jacket Wall Thickness
- 4.3.13 Jacket Tensile Strength and Elongation
- 4.3.14 Lamination Sealing (Tape-wrapped Jackets 11, 12, 22, 24, 25, 29, 61, 62, 72, 74, 75, 79)
- 4.3.15 Jacket Blocking
- 4.3.16 Concentricity
- 4.3.17 PTFE Tape-wrapped Jacket Delamination
- 4.3.18 Shield Solderability
- 4.3.19 Flammability
- 4.3.20 Smooth Surface Verification
- 4.3.21 Low-fluoride Test
- 4.3.22 Stripe, Band, or Print Durability
- 4.3.23 Pull Through Scrape Abrasion [Go to Page]
- 4.3.23.1 Test Apparatus
- 4.3.23.2 Test Procedure
- 4.3.24 Needle Abrasion
- 4.4 Cable Diameter
- 4.5 Cable Weight [Go to Page]
- 4.5.1 Measured
- 4.5.2 Calculated
- 4.6 Continuous Lengths
- 5 Packaging [Go to Page]
- 5.1 General
- 6 Notes [Go to Page]
- 6.1 Appendices
- 6.2 Ordering Data [Go to Page]
- 6.2.1 Acquisition Requirements
- 6.3 Stock and Inventory
- Appendix A (Informative) Cable Design Guidelines [Go to Page]
- A.1 Introduction
- A.2 Elements of Primary Wire Selection [Go to Page]
- A.2.1 Conductor Size
- A.2.2 Conductor Type
- A.2.3 Insulation Type
- A.3 Elements of Shield Selection [Go to Page]
- A.3.1 Material
- A.3.2 Flat vs. Round Strands
- A.3.3 Shield Coverage
- A.4 Elements of Jacket Selection
- A.5 Cable Identification and Color Codes
- A.6 Consultation
- Appendix B (Informative) Supersessions and Replacements [Go to Page]
- B.1 Superseded Symbols
- B.2 Manned Aerospace Replacements [Go to Page]
