Washington Administrative Code(WAC) and Revised Code of Washington (RCW) Electrical Practice Exam

What is the minimum height for a mast that must be guyed or provided with a stiff leg kit above the roof?

1. 18 in

2. 24 in

3. 26 in

4. 30 in

The correct answer is: 26 in

The correct answer is based on relevant sections of the Washington Administrative Code (WAC), particularly those that relate to the installation of masts and their structural requirements. The minimum height of 26 inches for a mast that needs to be guyed or supported with a stiff leg kit above a roof ensures stability and safety. When a mast extends above a building's roofline, it is exposed to environmental conditions such as wind loads, which can exert significant forces on the structure. A height of 26 inches provides enough elevation to reduce the risk of toppling or bending due to these forces. Additionally, adhering to this height requirement also aligns with best practices in electrical installations as outlined by both the WAC and National Electrical Code (NEC), which strive to ensure both the durability of electrical infrastructure and the safety of the surrounding environment. This requirement not only promotes structural integrity but also helps prevent interference with other nearby overhead structures or equipment. By ensuring that masts meet this height criterion, the regulations foster compliance with industry standards aimed at minimizing hazards associated with electrical installations.