Add 20% for routing, connections, and mistakes. 14 AWG for 15 amp circuits (lights), 12 AWG for 20 amp (outlets, kitchen). Romex (NM cable) for residential walls, individual wires in conduit for exposed runs. Always follow electrical codes and permits.
Quick Tips
- Always order 10-15% extra materials for waste
- Check local building codes before starting
- Measure twice, cut once — verify all inputs
Frequently Asked Questions
14 AWG for 15 amp circuits (lights), 12 AWG for 20 amp (outlets, appliances), 10 AWG for 30 amp.
Add 20% for routing around obstacles, into boxes, and connection slack.
Romex (NM cable) easier for residential walls. Individual THHN for conduit installations.