winch bar warnings WEBBING STRAP ASSEMBLY WARNINGS:

The aggregate working load limit of tiedowns used to secure an article or group of articles against movement must be at least one-half times the weight of the article or group of articles. The aggregate working load limit is the sum of:

  1. One-half the working load limit of each tiedown that goes from an anchor point on the vehicle to an anchor point on an article of cargo;
  2. One-half the working load limit of each tiedown that is attached to an anchor point on the vehicle, passes through, over, or around the article of cargo, and is then attached to the anchor point on the same side of the vehicle.
  3. The working load limit for each tiedown that goes from an anchor point on the vehicle, through, over, or around the article of cargo, and then attaches to another anchor point on the other side of the vehicle.

Per Canada National Safety Code for Motor Carriers, NSC Standard 10 Cargo Securement

Minimum Strength of Securement System

  1. In this section, the 'aggregate working load limit' is the sum of One-Half of the working load limit for each end section of a tiedown that is attached to an anchor point.
  2. The aggregate working load limit of the cargo securement system used to secure an article of cargo on or within a vehicle shall not be less than 50% of the weight of the article.
  3. The aggregate working load limit of the cargo securement system used to secure a group of articles of cargo on or within a vehicle shall not be less than 50% of the total weight of the group.

Owners/users of cargo restraint equipment should be familiar with the above documents in their entirety as applicable.