Alabama Contractors License Practice Exam

What type of wire should be used for supporting metal ducts according to standard practices?

1. 10-gage galvanized wire

2. 12-gage galvanized wire

3. 16-gage galvanized wire

4. 18-gage galvanized wire

The correct answer is: 16-gage galvanized wire

The use of 16-gage galvanized wire for supporting metal ducts aligns with established industry standards that take into consideration both strength and versatility. Galvanized wire effectively prevents rust and corrosion, which is particularly important in environments where moisture and various elements may be a concern. The 16-gage wire strikes a balance between being strong enough to support the weight of metal ducts while also being lightweight enough to handle and manipulate easily during installation. This specific gage ensures that the wire can bear the required loads without excessive strain, providing stability and safety for the ductwork. While other gauges of wire might be available, they may either be too weak or too strong for the specific applications related to ductwork support. For instance, a thicker gage could be more rigid and difficult to work with, which could complicate installation efforts. Thus, the choice of 16-gage galvanized wire is guided by both practical and compliance considerations in construction practices.