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Armored cable falling hammer impact test

Metal Sheathed Cables Falling weight impact tester UL 1569

Model: UT2028W; UL 1569, CSA C22.2 No. 123-16.

UT2028W Cable Falling weight impact tester is used to apply momentary impact force to test specimen of electrical cables, to determine the anti-impact performance of armored cables. Designed according the UL 1569 Clause 10.5 impact test. 

Finished cable shall be capable of withstanding without contact between circuit conductors, and without contact between a circuit conductor and the armor and any bare or insulated grounding conductor connected together, the energy of a free-falling, flat-faced weight that impacts the cable at the point at which the cable is laid over a steel rod. Flat cable shall be capable of withstanding the impact when tested with the broad and narrow faces laid over the rod (flatwise and edgewise using separate specimens).


Judge rules: The test sample of the cable should be gradually pushed forward and struck at each consecutive mark, with a total of ten impacts. If, at any of the ten impact points along the test length, any indicator light turns on at more than two points, the cable will be considered non-compliant.


Standard: UL 1569 UL Standard for Safety Metal-Clad Cables Section 5.10 Impact test

CSA C22.2 No. 123-16. Metal Sheathed Cables ; Section 6.15 Mechanical damage — Impact

General introduction

UT2028W Cable Falling Weight Impact Tester | UL 1569 & CSA C22.2 No.123-16 Compliant | UnitedTest


UnitedTest designs and manufactures the UT2028W Cable Falling Weight Impact Tester, a fully compliant laboratory test machine built to assess impact resistance and mechanical durability of armored metal-clad electrical cables following UL 1569 Clause 10.5 and CSA C22.2 No. 123-16 Section 6.15 impact test regulations.

The UT2028W equipment delivers controlled momentary free-falling impact force onto cable specimens to verify the anti-impact performance of armored cables for safety certification, factory quality control, and third-party electrical testing laboratories.


Standard Compliance Basis

1, UL 1569 Standard for Safety Metal-Clad Cables, Section 5.10 (Clause 10.5 Impact Test)

The test validates that finished metal-clad cables withstand flat-faced falling weight impact without dangerous electrical short circuits. Qualified cables must prevent three critical contact failures after impact:

No contact between internal circuit conductors

No contact between circuit conductors and metal armor

No contact between live conductors and bonded bare/insulated grounding conductors

Cable specimens rest over a steel rod during impact. Flat cables require separate flatwise (broad face) and edgewise (narrow face) testing with distinct samples to cover all installation orientations.

2, CSA C22.2 No. 123-16 Metal Sheathed Cables, Section 6.15 Mechanical Damage — Impact

This Canadian standard mandates identical falling weight impact evaluation for metal-sheathed power cables to prove resistance against on-site mechanical crushing and collision damage.


Official Test Judgment Rules

Operators gradually advance the cable sample and apply ten consecutive impact strikes at separate marked positions along the test length. The cable fails compliance testing if indicator lights activate at more than two impact points out of ten, which signals internal insulation breakdown and hazardous conductive contact.

Reliable impact test results from the UT2028W verify armored cable construction integrity, assist cable manufacturers in optimizing armor thickness and insulation formulations, and support global UL & CSA safety certification submissions for construction metal-clad wiring systems.

Key Features

  • Standard
  • Keywords

UL 1569 UL Standard for Safety Metal-Clad Cables Section 5.10 Impact test


CSA C22.2 No. 123-16. Metal Sheathed Cables ; Section 6.15 Mechanical damage — Impact


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Main Technical Specification

Impact heightAdjustable from 20mm to 1000mm
Impact hammersFour hammers weighing 1.36kg, 4.54kg, 11.34kg, and 22.7kg, all replaceable.
Surface specifications

for 4.54kg and 22.7kg hammers: 51mm x 152mm, with bottom edges rounded at R1.5mm.

1.36kg hammer: head diameter should be 28.5mm,   impact surface diameter 25mm, edges slightly rounded. 

11.34kg hammer: diameter 100mm, flat impact surface, slightly rounded edges.

Impact anvil specifications121mm x 76mm x 127mm, steel rod diameter: 19mm.
PowerServo motor.
DisplayTouchscreen PLC control, automatic impact height   setting and recording, automatically stops after the test
Impact result determination

(1) Judgment voltage: three-phase, 208V; 

(2) Three-phase short circuit between two phases, indicator neon light lights up; 

(3) Short circuit between each phase and neutral   or ground, single-phase indicator light lights up

Continuity tester3W, 120V, neon lamp indicator
PowerAC 220V, 50HZ
Dimensions800*800*1420mm
Load frame weight200kg


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