If you are to install a new messenger supported wire in an area, which of the following is an unacceptable action?

The choice to not attach to a preexisting messenger wire when installing new messenger-supported wire is based on safety and regulatory considerations. Messenger wires are designed to support specific types of cables, ensuring that the structural integrity, weight distribution, and environmental factors are adequately managed. When a new wire is attached to a messenger wire that is already loaded with the same type of cabling, it may exceed the weight capacity or compromise the integrity of the existing support system, leading to potential failures or hazards.

In addition, existing messenger wires may not be rated or tested for additional loads, which could result in not only the degradation of the cable's performance but also create dangers such as sagging, displacement, or even breaking of the support system itself. Proper installation practices as outlined in relevant codes and standards emphasize the importance of ensuring that all installations conform to the design and load specifications to mitigate these risks.

In contrast, using a factory-assembled aerial cable, field-installed lashing material, and messenger wires with wings and saddles are acceptable actions. They are designed to maintain safety and performance standards while ensuring that the installation is conducted in a manner that promotes reliability and compliance with established guidelines.