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Issued: August 1998
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TABLE OF CONTENTS
TABLE OF FIGURES
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1.
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Introduction
Test Method 905 — Trailer Cargo Anchoring Devices (November 1997)
is to be used for demonstrating compliance with the requirements of section
905 of Schedule IV to the Motor Vehicle Safety Regulations.
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(Original signed by)
B.A Jonah
Director, Motor Vehicle Standards and Research
for the Minister of Transport
Ottawa, Ontario
Safety Note
The forces used in the tests specified in this test method are sufficient
to cause serious injury or death should a test component fail. In order
to ensure the safety of personnel, the test equipment used must be capable
of withstanding the prescribed loads, and test personnel must be adequately
protected.
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2.
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Definitions
"Breaking Strength" means the maximum continuous load
that a cargo anchoring device and assembly can support without failing.
(résistance à la rupture)
"Working Load Limit" or "WLL" means a load
that is one-third the breaking strength of a tie-down component or assembly.
For instance, if the breaking strength of a tie-down component or assembly
is 6 800 kg (15 000 lb.), its working load limit would
be 2 268 kg (5 000 lb.). (charge utile)
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3.
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General Requirements
3.1 The tests prescribed by this test method may be performed on either
a completed trailer or on a fixture that accurately simulates a cargo anchoring
device when it is installed on a trailer.
Note: The Department of Transport conducts its compliance tests on completed
trailers.
3.2 Each cargo anchoring device is to be tested individually. No more than
one cargo anchoring device may be loaded at the same time.
3.3 Post-test deformation of a cargo anchoring device and the surrounding
support structure is permitted, as long as the structure resists a force
equal to or greater than 67 000 N (15 056 lb.), as specified
in subsection 905(4) of the Motor Vehicle Safety Regulations.
3.4 A load cell with an accuracy of 1% of full scale and with a capacity
of 70 000 N (15 730 lb.) or greater must be used to
measure the applied load. The load cell must be calibrated in accordance
with the manufacturer's instructions and be traceable to national standards.
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4.
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Test Procedure for Stake Pockets
4.1 The chain used in this test must conform to the requirements of the
National Association of Chain Manufacturers, Welded Steel Chain Specifications,
dated May 1, 1996; it must have a minimum size of 10 mm (3/8 inch);
and it must have a grade of 70 with a WLL of 2 290 kg (6 600 lb.)
or a grade of 80 with a WLL of 3 200 kg (7 100 lb.).
4.2 The grab hooks must be specified by the manufacturer to be suitable
for use with stake pockets, and they must have a minimum breaking strength
equivalent to that of the grade of chain to which they are attached.
4.3 The chain-and-grab-hook assembly must be attached to the stake pocket
in a manner similar to that illustrated in Figure 1 below.
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Figure 1 — Chain Loading Method for the Stake Pocket Test
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4.4 For stake pockets manufactured from aluminum alloys, block-type
test fixtures may be used, if it can be demonstrated that the use of chain-and-grab-hook
assemblies would cause excessive distortion.
4.5 The direction of the upward vertical force that is applied to the chain
exiting the stake pocket must be ± 10 degrees from the true vertical.
4.6 A upward vertical force must be equal to or greater than 67 000 N
(15 056 lb.), as indicated by the load cell, must be attained
within 2 minutes of commencing the application of the force.
4.7 A force equal to or greater than 67 000 N (15 056 lb.),
as indicated by the load cell, must be maintained for 15 seconds.
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5.
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Test Procedure for Winch Assemblies
5.1 The breaking strength of the webbing or the webbing-and-chain assembly
used in this test must be specified by the manufacturer as being equal to
or greater than 89 000 N (20 000 lb.).
5.2 Due to the elastic nature of webbing, the length of webbing between
the winch and test fixture must be kept to a minimum.
5.3 The webbing must be wrapped around the winch spool 2 to 4 times.
5.4 The webbing or webbing-and-chain assembly must be attached to the winch
assembly in a manner similar to that illustrated in Figure 2 below.
5.5 The direction of the upward vertical force that is applied to the webbing
or the webbing-and-chain assembly exiting the winch assembly must be ± 10 degrees
from the true vertical.
5.6 A upward vertical force must be equal to or greater than 67 000 N
(15 056 lb.), as indicated by the load cell, must be attained
within 2 minutes of commencing the application of the force.
5.7 A force equal to or greater than 67 000 N (15 056 lb.),
as indicated by the load cell, must be maintained for 15 seconds.
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Figure 2 — Webbing Loading Methods for the Winch Assembly Test
6.
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Test Procedure for D-Rings and Similar Devices
6.1 The chain used in this test must conform to the requirements of the
National Association of Chain Manufacturers, Welded Steel Chain Specifications,
dated May 1, 1996; it must have a minimum size of 10 mm (3/8 inch);
and it must have a grade of 70 with a WLL of 2 290 kg (6 600 lb.)
or a grade of 80 with a WLL of 3 200 kg (7 100 lb.).
6.2 The chain shackles must be certified by the manufacturer to be suitable
for use with D-rings and similar devices, and they must have a minimum breaking
strength equivalent to that of the grade of chain to which they are attached.
6.3 The D-ring or similar device must be tested in a manner similar to that
illustrated in Figure 3 below.
6.4 The direction of the upward vertical force that is applied to the chain
assembly extending from the D-ring or similar device must be ± 10 degrees
from the true vertical.
6.5 A upward vertical force must be equal to or greater than 67 000 N
(15 056 lb.), as indicated by the load cell, must be attained
within 2 minutes of commencing the application of the force.
6.6 A force equal to or greater than 67 000 N (15 056 lb.),
as indicated by the load cell, must be maintained for 15 seconds.
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Figure 3 — Chain Loading Method for D-Rings and Similar Devices
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