Frame structures include line frames, busbars, gantry frames, corner frames, transformer assembly frames, and single-pole equipment supports, etc.

Form classifications of structures commonly used include AH-type incoming and outgoing line structures, A-type with lightning rod bracket incoming and outgoing line structures, A-type structures, Aח-type structures, type structures, corner structures, large character structures, and structures with tensioned incoming and outgoing line structures. By classifying structures based on their load-bearing conditions, there are: middle structures, terminal structures, and tensioned line structures.