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Wireman · Electrical calculators · 2023 NEC ·

2023 NEC

Calculate

Each calculator gives a straight answer first, then shows the code sections and math behind it. Save results to a project report and download it as Excel or PDF.

Wire

Wire size & ampacityPick the right wire and breaker for a load, with temperature and bundling derates.310.16, 310.15, 240.4Voltage dropHow many volts you lose over a long run, and the wire size that keeps it under 3%.Ch. 9 Table 8

Raceway & boxes

Conduit fillWill these wires fit in this pipe? Mixed sizes and types in EMT, PVC, RMC, IMC or FMC.Ch. 9 Tables 1, 4, 5Box fillIs this box big enough? Every conductor, clamp, device and ground counted line by line.314.16

In the field

EMT bendingStub-ups, offsets, saddles, rolling offsets and segmented 90s, with marks and a picture.Ch. 9 Table 2

Loads & equipment

Dwelling load calcSize a house service with the standard or optional method.Article 220Motor circuitWire, overloads, breaker or fuse, and disconnect for a single motor.Article 430