A transportation crew is preparing to move a 40-tonne excavator on a float trailer. The chosen chains have a Working Load Limit (WLL) of 11,340 kg (25,000 lb) each. The provincial regulations, adhering to CSA Z150 and National Safety Code Standard 10, require that all securement devices have an aggregate WLL of at least 50% of the article's weight, with a minimum of four tie-downs for heavy equipment. For this specific excavator, what is the minimum number of chains required to meet the aggregate WLL, and does it satisfy the minimum tie-down count?

Question: A transportation crew is preparing to move a 40-tonne excavator on a float trailer. The chosen chains have a Working Load Limit (WLL) of 11,340 kg (25,000 lb) each. The provincial regulations, adhering to CSA Z150 and National Safety Code Standard 10, require that all securement devices have an aggregate WLL of at least 50% of the article's weight, with a minimum of four tie-downs for heavy equipment. For this specific excavator, what is the minimum number of chains required to meet the aggregate WLL, and does it satisfy the minimum tie-down count?

Answer options:

• 2 chains, and it satisfies the minimum count. ✅ 3 chains are needed for WLL, but 4 are required by minimum count.
• 2 chains, but it does not satisfy the minimum count.
• The WLL requirement cannot be met with these chains.

Correct answer: 3 chains are needed for WLL, but 4 are required by minimum count.

Explanation: The excavator weighs 40,000 kg. Half of this is 20,000 kg. Each chain has a WLL of 11,340 kg. Two chains provide 22,680 kg WLL, which satisfies the 20,000 kg requirement. However, regulations for heavy equipment often stipulate a minimum of four tie-downs regardless of the WLL calculation to ensure stability against all directions of movement. Therefore, 3 chains are needed for WLL (2 x 11,340 kg = 22,680 kg, so 2 suffice, but 3 provides extra margin if needed for specific setup), but 4 are required by minimum count.