Section 2Requirements for electrical installations -- 2.1 -- Section 3 Overcurrent protection -- 3.1 -- Section 4 Wiring methods and materials -- 4.1 -- Section 5 Primary and secondary service and system configurations -- 5.1 -- Section 6 Preliminary load calculations -- 6.1 -- Section 7 Short-circuit calculations -- 7.1 -- Section 8 Selective coordination of protective devices -- 8.1 -- Section 9 Component short-circuit protection -- 9.1 -- Section 10 Motor feeders and starters -- 10.1 -- Section 11 Standard voltages and voltage drop -- 11.1 -- Section 12 Transformers -- 12.1 -- Section 13 Grounding, ground-fault, and lightning protection -- 13.1 -- Section 14 Emergency and standby power systems -- 14.1 -- Section 15 NEC Chapter 9 tables, and appendices B and C -- 15.1 -- Section 16 Lighting -- 16.1 -- Section 17 Hazardous (classified) locations -- 17.1 -- Section 18 Telecommunications structured cabling systems -- 18.1 -- Section 19 Miscellaneous special applications -- 19.1 -- Section 20 Metrification -- 20.1.