According to ATM A153, what material must anchor bolts and nuts used for substation foundations be made of?

The selection of anchor bolts and nuts made of hot-dipped galvanized material is essential in substation foundations due to its protective properties against corrosion. Hot-dipped galvanization involves coating steel with zinc through a process that significantly enhances its durability and resistance to environmental elements. This is particularly important in substations where equipment is exposed to various weather conditions, including moisture and pollutants that could lead to corrosion and structural weaknesses over time.

Using hot-dipped galvanized materials not only prolongs the lifespan of the anchor bolts and nuts but also ensures a reliable and safe installation for critical substation infrastructure. This mitigation of corrosion helps to maintain the integrity of the foundation, which supports heavy electrical equipment and ensures the overall stability of the installation.

In contrast, options like bronze and stainless steel, while resistant to rust, may not provide the same level of strength or cost-effectiveness for this particular application. Cold-rolled steel, on the other hand, lacks the protective coating that hot-dipped galvanization offers, making it more susceptible to environmental degradation. Thus, hot-dipped galvanized material is the preferred choice for anchor bolts and nuts in substation foundations.