Guides
The questions the calculators get asked most, answered at length: where the answer comes from, what the number does not cover, and which tool settles it.
- What size breaker: the wire decides, not the applianceThe rule behind every breaker question: load current first, standard rating second, and the wire sets the ceiling. Worked on a 18.75 A continuous load.Last updated: September 13, 2026
- Wire size for a long run: why 100 ft changes the answerPast about 50 ft, the wire that carries the current is no longer the wire the load needs. Here is how the drop allowance sets the size, and where the calculator stops.Last updated: September 13, 2026