Which of the following is NOT an allowable means of suspension?

The correct answer identifies chains as not an allowable means of suspension within the context of elevating devices. In the realm of elevating devices, particularly in building lifts and similar systems, the materials used for suspension must meet specific safety and operational standards.

Wire ropes, synthetic slings, and steel cables are commonly used due to their flexibility, high tensile strength, and resistance to fatigue and environmental factors. These materials are favorable because they can distribute loads effectively while also being lightweight, making them ideal for various lifting applications. Synthetic slings also offer the advantage of reduced weight and ease of handling, while still providing the necessary strength for many lifting tasks.

Chains, on the other hand, although strong and durable, may not be suitable in many elevating device configurations due to rigidity and potential for twisting or uneven load distribution. Additionally, chains may not provide the necessary shock absorption or flexibility in dynamic lifting scenarios. This makes them less desirable for use in elevating devices where smooth operation and load management are critical for safety and functionality.

Therefore, identifying chains as not an allowable means of suspension aligns with safety practices and operational protocols in elevating device mechanics, emphasizing the importance of using appropriate materials in these applications.