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IBEW LOCAL 3 · JOURNEYMAN
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Voltage drop
AWG · distance · NEC
Phase tool
Circuit · wire color
Wire pull
Tension · jam ratio
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IBEW Local 3 · Journeyman wireman
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OhmBase is a reference & estimating tool, not engineering advice. Tables are based on
NEC 2023 — always verify against the code edition
adopted by your AHJ. You are responsible for the accuracy of your work.
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Tools
16 calculators & references
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Calculators
Voltage drop
NEC 210.19 · 3% rec / 5% max
Ohm's law
V = IR · P = VI
Load calc
NEC 220 · residential
Wire ampacity
NEC 310.15 · THHN 75°C
Box fill
NEC 314.16 · cubic inches
Motor wiring
NEC 430 · FLA tables
Conduit bending
Stub · offset · saddle
Phase tool
Circuit · wire color
Wire pull
Tension · jam ratio · bends
Raceway sizing
Mixed fill · NEC Ch.9
Panel schedule
Build & label panel
Job cost
NECA MLU · classification rates
References
NEC quick reference
Common articles & key numbers — not a full code lookup
Grounding & bonding
NEC 250 — EGC, GEC, bonding jumpers, electrodes
Troubleshooting guide
Field fault trees — GFCI, breakers, motors, wiring
Job tools
Material estimator
Parts list builder — preset + custom items · copy as text