Section 02 · Algebraic Circuits & Conduit

The Electrician

Pick a lab below. Every calculator obeys real NEC rules — ampacity, derating, continuous-load limits, and voltage-drop targets.

Allowed = Base × Ambient-Factor × Fill-Factor • Continuous ≤ 80% × Allowed

The max current a wire can carry before insulation breaks down — derated for heat and how many wires share the conduit.

Wire gauge (Cu, 75°C THWN)

Ambient temperature

Conductors in raceway3

Base ampacity

25 A

Ambient factor

×1

Fill factor

×1

Derated allowed

25.0 A

Continuous load (80% rule)

20.0 A max

Reference NEC Table 310.16 (75°C Cu THWN). Verify against latest local code adoption.