Glossary B
Bus support insulator is a porcelain or fiberglass insulators that serve to isolate the bus bar switches and other support structures and to prevent leakage current from flowing through the structure or to ground. These insulators are similar in function to other insulators used in substations and transmission poles and towers.
Bullet refers to the projectile expelled from a gun. It is not synonymous with cartridge. Bullets can be of many materials, shapes, weights and constructions such as solid lead, lead with a jacket of harder metal, round-nosed, flat-nosed, hollow-pointed, etc.
Buckram is described as a heavy weave cotton cloth dyed and filled with a compound to make it more durable. Suitable for sustained use and heavier than book cloth.