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Systems · Chapter 21

Electrical

Electricity enters at the meter, splits at the panel and travels on circuits to every outlet, light and appliance. Most rules protect against shock (GFCI) and fire (AFCI).

NEC 210.8 GFCINEC 210.12 AFCINEC 230.67 surgeNEC 210.52 outlets
1 of 6Next: GFCI + AFCI →
21.1

How power moves through a house

Utility → meter → main panel → circuits → devices. Every step has a size and a rule.

Every circuit starts at the panel; label it.
Diagram: utility drop, meter, main panel with breakers, circuits branching to kitchen, bath, bedrooms, outdoors
  1. 1Service drop
  2. 2Meter
  3. 3Main panel
  4. 4Kitchen
  5. 5Bath
  6. 6Bedrooms
  7. 7Outdoors
FIG. 21.1 · How power moves through a house
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The rest of Electrical: 5 more spreads, 20 drawings and 23 code citations, plus every other chapter, is part of the full fieldbook.

  1. 21.2GFCI, AFCI and surge5 drawings
  2. 21.3Old wiring red flags6 drawings
  3. 21.4Backup power and big loads6 drawings
  4. 21.5Planning outlets and circuits3 drawings
  5. 21.6Outlet and switch ideas0 drawings
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