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eLibrary > BS EN IEC 60115-4:2026+A11:2026 Fixed resistors for use in electronic equipment - Sectional specification: Power resistors for through hole assembly on circuit boards (THT) or for assembly on chassis >

BS EN IEC 60115-4:2026+A11:2026 Fixed resistors for use in electronic equipment - Sectional specification: Power resistors for through hole assembly on circuit boards (THT) or for assembly on chassis, 2026

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BS EN IEC 60115-4:2026+A11:2026 Fixed resistors for use in electronic equipment - Sectional specification: Power resistors for through hole assembly on circuit boards (THT) or for assembly on chassis, 2026

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English [Go to Page]
CONTENTS
FOREWORD
1 Scope
2 Normative references
3 Terms, definitions, product types, product technologies and product classification [Go to Page]
3.1 Terms and definitions
3.2 Product types [Go to Page]
3.2.1 General
3.2.2 Axial type
3.2.3 Radial type
Figures [Go to Page]
Figure 1 – Illustrations of typical axial leaded power resistors
Figure 2 – Illustrations of typical radial leaded power resistors [Go to Page]
3.2.4 Vertical type
3.2.5 Tubular types
Figure 3 – Illustrations of typical vertical leaded power resistors with punched terminals
Figure 4 – Illustrations of typical tubular type power resistors [Go to Page]
3.2.6 Metal housed wire-wound resistors
3.2.7 Any other type
3.3 Resistor encapsulation and material of termination [Go to Page]
3.3.1 Conformal lacquer coat
3.3.2 Silicone cement coating
Figure 5 – Illustrations of typical metal housed power resistors [Go to Page]
3.3.3 Enamel coating
3.3.4 Ceramic housed resistor
3.3.5 Wire termination
3.4 Product technologies [Go to Page]
3.4.1 General
3.4.2 Metal film technology
3.4.3 Metal glaze technology
3.4.4 Metal oxide technology
3.4.5 Wire-wound technology
3.4.6 Metal strip technology
3.4.7 Any other technology
3.5 Product classification
4 Preferred characteristics [Go to Page]
4.1 General
4.2 Preferred types, styles and dimensions [Go to Page]
4.2.1 Axial type
Figure 6 – Shape and dimensions of cylindrical axial leaded resistors
Tables [Go to Page]
Table 1 – Examples of preferred styles of cylindrical axial leaded power resistors
Figure 7 – Alternative methods for specification of the length of excessive protective coating or welding beads on axial leaded resistors
Figure 8 – Lead-wire spacing of axial leaded resistors with bent leads [Go to Page]
4.2.2 Ceramic housed type with axial lead wires
Figure 9 – Specification of the lead eccentricity of axial leaded resistors
Figure 10 – Shape and dimensions of axial leaded ceramic housed resistors
Table 2 – Examples of preferred styles of axial leaded ceramic housed resistors [Go to Page]
4.2.3 Ceramic housed type with radial lead wires
Figure 11 – Shape and dimensions of radial type ceramic resistors
Table 3 – Examples of preferred styles of radial type ceramic resistors [Go to Page]
4.2.4 Radial or vertical ceramic housed type and dimensions
Figure 12 – Shape and dimensions of radial leaded ceramic resistors [Go to Page]
4.2.5 Tubular type of power resistors
Figure 13 – Shape and dimensions of tubular resistors
Table 4 – Preferred styles of radial or vertical mount ceramic resistors [Go to Page]
4.2.6 Other types
Table 5 – Example of preferred styles of tubular types of power resistors
4.3 Preferred climatic categories
4.4 Resistance
4.5 Tolerances on resistance
4.6 Rated dissipation Pr
Figure 14 – Typical derating curve for MET > UCT
Figure 15 – Typical derating curve for power wire-wound resistors
4.7 Limiting element voltage Umax
4.8 Insulation voltage Uins
4.9 Insulation resistance Rins
5 Tests and test severities [Go to Page]
5.1 General provisions for tests invoked by this specification
5.2 Preparation of specimen [Go to Page]
5.2.1 Drying
5.2.2 Mounting of power resistors on test boards
5.2.3 Mounting of power resistors on test racks
Figure 16 – Assembly of specimen to the test board
Figure 17 – Mounting of axial leaded specimens on a rack, top view [Go to Page]
5.2.4 Specification of test boards/ racks for any other type of high-power resistors
5.3 Details of applicable tests [Go to Page]
5.3.1 Resistance
5.3.2 Temperature coefficient of resistance
Figure 18 – Examples of specimen lead fixation devices [Go to Page]
5.3.3 Temperature rise
5.3.4 Endurance at the rated temperature 70 °C
5.3.5 Endurance at room temperature
5.3.6 Endurance at a maximum temperature: UCT with category dissipation
5.3.7 Short-term overload
5.3.8 Single-pulse high-voltage overload test
5.3.9 Periodic-pulse high-voltage overload test
5.3.10 Visual examination
5.3.11 Gauging of dimensions
Table 6 – Preferred alternative overload conditions [Go to Page]
5.3.12 Detail dimensions
5.3.13 Robustness of the resistor body
5.3.14 Robustness of terminations
5.3.15 Bump
5.3.16 Shock
5.3.17 Vibration
5.3.18 Rapid change of temperature
5.3.19 Rapid change of temperature, ≥ 100 cycles
5.3.20 Climatic sequence
5.3.21 Damp heat, steady state
5.3.22 Solderability, with lead-free solder
5.3.23 Solderability, with SnPb solder
5.3.24 Resistance to soldering heat
5.3.25 Solvent resistance
5.3.26 Insulation resistance
5.3.27 Voltage proof
5.4 Optional and/or additional tests [Go to Page]
5.4.1 Single-pulse high-voltage overload test
5.4.2 Periodic-pulse overload test
5.4.3 Electrostatic discharge (ESD)
5.4.4 Robustness of threaded stud or screw terminations
5.4.5 Operation at low temperature
5.4.6 Damp heat, steady state, accelerated
5.4.7 Accidental overload test
5.4.8 Flammability
6 Performance requirements [Go to Page]
6.1 General
6.2 Limits for change of resistance at test
Table 7 – Limits for resistance variations at tests
6.3 Temperature coefficient of resistance
6.4 Temperature rise
Table 8 – Permitted change of resistance due to the temperature coefficient of resistance
6.5 Visual inspection [Go to Page]
6.5.1 General visual criteria
6.5.2 Visual criteria after tests
6.5.3 Visual criteria for the packaging
6.6 Solderability
6.7 Insulation resistance
6.8 Flammability
6.9 Accidental overload test
7 Marking, packaging and ordering information [Go to Page]
7.1 Marking of the component
7.2 Packaging
7.3 Marking of the packaging
7.4 Ordering information
8 Detail specifications [Go to Page]
8.1 General
8.2 Information to be specified in a detail specification [Go to Page]
8.2.1 Outline drawing or illustration
8.2.2 Type, style, and dimensions
8.2.3 Climatic category
8.2.4 Resistance range
8.2.5 Tolerances on rated resistance
8.2.6 Rated dissipation P70
8.2.7 Limiting element voltage Umax
8.2.8 Insulation voltage Uins
8.2.9 Insulation resistance Rins
8.2.10 Tests and test severities
8.2.11 Limits of resistance change after testing
8.2.12 Temperature coefficient of resistance
8.2.13 Marking
8.2.14 Ordering information
8.2.15 Mounting
8.2.16 Storage
8.2.17 Transportation
8.2.18 Additional information
8.2.19 Quality assessment procedures
9 Quality assessment procedures [Go to Page]
9.1 General
9.2 Definitions [Go to Page]
9.2.1 Primary stage of manufacture
9.2.2 Structurally similar components
9.2.3 Assessment level EZ
9.3 Formation of inspection lots
9.4 Approved component (IECQ AC) procedures
9.5 Qualification approval (QA) procedures [Go to Page]
9.5.1 General
9.5.2 Qualification approval
9.5.3 Quality conformance inspection
9.6 Capability certification (IECQ AC-C) procedures
9.7 Technology certification (IECQ-AC-TC) procedures
9.8 Periodical evaluation of termination platings
9.9 Delayed delivery
9.10 Certified test records
9.11 Certificate of conformity (CoC)
Table 9 – Test schedule for the qualification approval of power resistors
Table 10 – Test schedule for quality conformance inspection of power resistors
Annex A (normative) Symbols and abbreviated terms [Go to Page]
A.1 Symbols
A.2 Abbreviated terms
Annex B (normative) Visual inspection acceptance criteria [Go to Page]
B.1 General
B.2 Acceptance criteria for a general visual inspection of body of specimens
B.3 Acceptance criteria for a general visual inspection of the terminals
B.4 Acceptance criteria for a general visual inspection of specimen after test
Annex C (normative) Workmanship requirements for the assembly of power resistors [Go to Page]
C.1 General
C.2 Lead forming [Go to Page]
C.2.1 General
Figure C.1 – Lead forming dimensions [Go to Page]
C.2.2 Means for support of mounting height
Table C.1 – Lead bend radius
C.3 Mounting [Go to Page]
C.3.1 General
Figure C.2 – Examples of mounting height support
Table C.2 – Recommended circuit board bore diameters [Go to Page]
C.3.2 Lateral mounting
Figure C.3 – Clearance between coating and solder
Figure C.4 – Lateral mounting [Go to Page]
C.3.3 Upright mounting
Figure C.5 – Upright mounting
Table C.3 – Clearance of lateral mounted resistors
C.4 Lead trimming
Figure C.6 – Lead protrusion
Figure C.7 – Lead end distortion
Annex D (informative) Zero ohm resistors (jumpers)
Annex E (informative) Guide on the application of optional and/or additional tests [Go to Page]
E.1 General
E.2 Endurance at room temperature
E.3 Single-pulse high-voltage overload test
Table E.1 – Implementation of the test endurance at room temperature
E.4 Periodic-pulse overload test
Table E.2 – Implementation of the single-pulse high-voltage overload test
E.5 Operation at low temperature
Table E.3 – Implementation of the periodic-pulse overload test
E.6 Damp heat, steady state, accelerated
Table E.4 – Implementation of the operation at low temperature test
E.7 Accidental overload test
Table E.5 – Implementation of the test damp heat, steady state, accelerated
E.8 Flammability test
Table E.6 – Implementation of the test accidental overload test
E.9 Electrostatic discharge test (ESD)
Table E.7 – Implementation of the test flammability
E.10 Robustness of threaded stud or screw terminations
Table E.8 – Implementation of the test Electrostatic discharge (ESD)
Table E.9 – Implementation of the test Robustness of threaded stud or screw terminations
Annex F (informative) Radial formed types from axial styles [Go to Page]
F.1 General [Go to Page]
F.1.1 Applicability of this annex
F.1.2 Denomination of radial formed styles
Figure F.1 – Production flow and different scopes of quality assurance [Go to Page]
F.1.3 Coated lead wires
F.1.4 Means for support of mounting height
F.1.5 Means for retention
F.2 Radial formed types for through hole assembly [Go to Page]
F.2.1 Radial formed style with lateral body position
Figure F.2 – Shape and dimensions of radial formed resistor for lateral body position
Figure F.3 – Shape and dimensions of radial formed resistor for lateral body position with kinked lead wires
Table F.1 – Feasible lead-wire spacing of radial formed resistor for lateral body position [Go to Page]
F.2.2 Radial formed style with upright body position
Figure F.4 – Shape and dimensions of radial formed resistor for upright body position
Figure F.5 – Shape and dimensions of radial formed resistor for upright body position and wide spacing
Figure F.6 – Shape and dimensions of radial formed resistor for upright body position and wide spacing, with kinked lead wire
F.3 Radial formed types for surface-mount assembly
Figure F.7 – Shape and dimensions of radial formed resistor for surface-mount assembly (Z-bend)
Table F.2 – Feasible lead-wire spacing of radial formed resistor for upright body position
F.4 Packaging [Go to Page]
F.4.1 Packaging of resistors formed for through-hole assembly
Figure F.8 – Land pattern dimensions for surface-mount assembly [Go to Page]
F.4.2 Packaging of resistors formed for surface-mount assembly
F.5 Quality assessment [Go to Page]
F.5.1 General
F.5.2 Quality assessment of formed resistors
F.5.3 Forming of finished resistors of assessed quality
F.5.4 Special inspection requirements
Annex X (informative) Cross references for the prior revision of this specification
Bibliography
BACK COVER WITH LINKS.pdf [Go to Page]
Foreword
Section 1 General [Go to Page]
1 Scope
2 Normative references
3 Terms, definitions, symbols and abbreviated terms [Go to Page]
3.1 Terms and definitions
3.2 Symbols
3.3 Abbreviated terms
Section 2 Fendering [Go to Page]
4 General principles [Go to Page]
4.1 Provision and overall design of fendering systems
Table 1 — Berth features to be taken into account in the design of the fendering system
Table 2 — Vessel features to be taken into account in the design of the fendering system
4.2 Selection and design of fenders
4.3 Vessel characteristics [Go to Page]
4.3.1 General
4.3.2 Vessels with bulbous bows
Figure 1 — Geometry of vessel with bulbous bow impacting the quay structure
4.3.3 Belting
4.4 Fender layout for berths and other locations [Go to Page]
4.4.1 General
Figure 2 — Hull and cope geometry at initial contact
Figure 3 — Approximation of bow radius
4.4.2 Continuous quays
4.4.3 Island berths
Figure 4 — Fender layout for three island berth
Figure 5 — Fender layout for five island berth
4.4.4 Lead-in jetties and lock entrances
4.5 Berthing procedure [Go to Page]
4.5.1 Alongside berthing
Figure 6 — Geometry of vessel approach to berth
4.5.2 Ferry and Ro-Ro berths
Figure 7 — Ferry and Ro‑Ro vessel berthing
4.6 Berthing reactions and load distribution [Go to Page]
4.6.1 General
4.6.2 Hull pressures
Table 3 — Guidance on hull pressure
4.6.3 Fender energy absorption and reaction due to parallel and angular berthing
Figure 8 — Hull and fender geometry at contact
4.7 Moored reactions
4.8 Moored vessels subject to wave action
5 Calculation of berthing energies [Go to Page]
5.1 Characteristic and design berthing energy
5.2 Calculation of characteristic berthing energies for alongside berthing [Go to Page]
5.2.1 General
5.2.2 Berthing velocities
5.2.3 Displacement
5.2.4 Hydrodynamic mass coefficient
5.2.5 Eccentricity coefficient
5.2.6 Softness coefficient
5.2.7 Berth configuration coefficient
5.3 Calculation of berthing energies for ferry and Ro-Ro berths [Go to Page]
5.3.1 Characteristic berthing velocities
5.3.2 Side fenders
5.3.3 End fenders
6 Selection of fenders and fender types [Go to Page]
6.1 General
6.2 Materials and workmanship
6.3 Fenders using moulded/wrapped/extruded elastomeric units [Go to Page]
6.3.1 Fender selection
6.3.2 Fender reactions for the design of fender support structures, fender panels and fender ancillary items
6.4 Torsion arm fenders
Figure 9 — Torsion arm fender
6.5 Pneumatic and foam-filled fenders [Go to Page]
6.5.1 Pneumatic fenders
6.5.2 Foam-filled fenders
6.6 Shear forces on fenders
Table 8 — Typical coefficients of friction of fender-facing materials in dry conditions
6.7 Mounting and suspension [Go to Page]
6.7.1 General
6.7.2 Fixings
6.7.3 Restraint chains
6.7.4 Suspension systems for fenders
6.8 Fender panels [Go to Page]
6.8.1 Geometry
6.8.2 Design
6.8.3 Fabrication
6.8.4 Maintenance
6.9 Fender spools [Go to Page]
6.9.1 Design
6.9.2 Fixings
6.9.3 Corrosion mitigation
6.9.4 Fabrication
6.9.5 Maintenance
6.10 Flexible dolphins [Go to Page]
6.10.1 Loadings
6.10.2 Design of flexible dolphin
6.10.3 Design deflections
6.10.4 Decks and berthing frames
6.10.5 Flexible dolphins with fenders
Figure 11 — Flexible dolphins
6.11 Traceability
Section 3 Mooring [Go to Page]
7 Principles of effective mooring [Go to Page]
7.1 General
7.2 Snap back
7.3 Mooring lines [Go to Page]
7.3.1 Breast lines
7.3.2 Spring lines
7.3.3 Head and stern lines and additional mooring lines
7.4 Mooring layouts [Go to Page]
7.4.1 General
7.4.2 Continuous quays
Figure 12 — Typical mooring pattern for continuous quay
7.4.3 Island or similar berths
Figure 13 — Optimum angles of mooring lines for island tanker berth
8 Actions acting on the moored vessel [Go to Page]
8.1 General
8.2 Wind and currents
8.3 Hydrodynamic forces [Go to Page]
8.3.1 Off‑quay hydrodynamic forces
Figure 14 — Vessel under influence of stand off force
8.3.2 Passing vessel effects
8.3.3 Long period and infragravity waves
8.4 Tidal rise and fall and change in draught or trim due to cargo operations
8.5 Ice
Figure 15 — Effect of rise and fall of tide and change in draught or trim
9 Loads on mooring points [Go to Page]
9.1 General
9.2 Calculation methods [Go to Page]
9.2.1 General
9.2.2 Method 1: Elastic analysis
9.2.3 Method 2: Simple shared loads
9.2.4 Method 3: Working line loads
9.2.5 Method 4: Computer simulation or physical modelling
9.2.6 Method 5: Notional bollard load capacity
Table 9 — Nominal bollard capacity for preliminary design of continuous berths accommodating vessels up to 20 000 t displacement
9.3 Design of mooring point supporting structures
10 Berth mooring equipment [Go to Page]
10.1 Materials and testing
10.2 Mounting and fixing
10.3 Traceability
10.4 Bollards
Table 10 — Mooring bollards
Table 11 — Partial factors associated with the uncertainty of the resistance model applicable to the design of bollards
10.5 Quick release mooring hooks
10.6 Capstans
10.7 Alternative mooring systems [Go to Page]
10.7.1 Hydraulic piston mooring systems
10.7.2 Vacuum mooring systems
10.7.3 Magnetic mooring systems
Annex A (normative)Performance testing of elastomeric fender units
A.1 Test pieces
A.2 Number of test pieces
A.3 Test laboratory and apparatus
A.4 Independent verification
A.5 Thermal stabilization
Table A.1 — Calculation of Δ for determining the duration of thermal stabilization
A.6 Compression velocity
A.7 Angular compression
A.8 Extent of compression
A.9 Calculation of energy absorption
A.10 Stability of test piece
A.11 Test procedure
A.12 Pass criteria
A.13 Test report
A.14 Establishment of fender performance factors
A.15 Performance testing for type approval
Annex B (informative)Berthing velocities
B.1 Historic approach
B.2 WG211 approach
B.3 Alternative approach
Figure B.1 — Suggested minimum berthing velocities
Table B.1 — Minimum characteristic berthing velocities
Annex C (normative)Durability testing of elastomeric fender units
C.1 Test pieces
C.2 Number of test pieces
C.3 Number and extent of compressions
C.4 Test laboratory and apparatus
C.5 Test procedure
C.6 Pass criteria
C.7 Test report
C.8 Durability testing for type approval
Annex D (informative)Further background to moored ship dynamic response
Annex E (normative)Numerical modelling
Figure E.1 — The six degrees of freedom of vessel motion
Annex F (normative)Physical modelling
Annex G (normative)Testing of mooring equipment
G.1 General
G.2 Laboratory testing [Go to Page]
G.2.1 General
G.2.2 Testing pass criteria
G.2.3 Minimum breaking load (MBL)
G.2.4 Verification of working load limit at project stage
G.3 Reporting of laboratory testing
G.4 Conformity
G.5 Verification of WLL of installed mooring equipment
G.6 Reporting of in situ testing
Bibliography [Go to Page]

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BS EN IEC 60115-4:2026+A11:2026 Fixed resistors for use in electronic equipment - Sectional specification: Power resistors for through hole assembly on circuit boards (THT) or for assembly on chassis, 2026

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BS EN IEC 60115-4:2026+A11:2026 Fixed resistors for use in electronic equipment - Sectional specification: Power resistors for through hole assembly on circuit boards (THT) or for assembly on chassis, 2026

⨯To continue with accurate pricing,
please select your company type below: