Equipment classes
Classes of power equipment and the tests each class receives, from transformers and switchgear to cables, batteries and rotating machines.
- Liquid filled transformers
Chapter 11 of NFPA 70B-2026 covers the maintenance of power and distribution transformers; its periodic maintenance procedures are visual inspection, cleaning, mechanical servicing and electrical testing, with the lubrication and special subdivisions reserved.
- Low voltage circuit breakers
Chapter 15 of NFPA 70B-2026 covers low- and medium-voltage circuit breakers; section 15.3 holds the periodic maintenance procedures for molded-case, insulated-case and low-voltage power circuit breakers, and section 15.4 those for medium-voltage power circuit breakers.