Florida InterNACHI State Practice Exam 2026 - Free Practice Questions and Study Guide

A rigid service mast should be secured to the structure every 5 to 6 feet to ensure stability and support. This requirement is crucial because the service mast carries the weight of overhead wiring and must withstand various environmental factors, including wind and load changes. By securing it at regular intervals, it reduces the risk of sway or movement, which could lead to strain on both the mast and the connected electrical equipment. This regular securing also contributes to safety by minimizing the chances of electrical failures or damage to the infrastructure due to inadequate support.