Guides
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3 Point Saddle Bend: Layout, Multiplier and Shrink (Plus the 4-Point Saddle)
How to bend a 3 point saddle in EMT: the exact multiplier vs the 2.5 rule, shrink, mark layout and bend order, plus how to lay out a 4-point saddle over wider obstacles.
NEC 2023 · updated Oct 20, 2026
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How Many 12 Gauge Wires in 3/4 Conduit? Conduit Fill Worked Examples (NEC Ch. 9)
How many 12 gauge wires fit in 3/4 conduit, 1/2 EMT or 1 inch pipe, and how to work out conduit fill yourself for mixed sizes, with NEC 2023 Chapter 9 examples.
NEC 2023 · updated Oct 20, 2026
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How to Calculate Box Fill, Step by Step (and Do Grounds Count?)
How to calculate box fill under NEC 2023 314.16: count conductors, clamps, devices and grounds, convert to cubic inches, and pick a box, with worked examples.
NEC 2023 · updated Oct 20, 2026
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Offset Multiplier Chart and Shrink: How to Bend an Offset in EMT
Offset multiplier chart for 10°, 22.5°, 30°, 45° and 60° bends, a shrink chart in sixteenths, and step-by-step layout for bending an offset in 1/2 and 3/4 EMT.
NEC 2023 · updated Oct 20, 2026
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What Size Wire for a 100 Amp Service 200 ft Away? (and at 100 or 300 ft)
What size wire for a 100 amp service or subpanel 200 ft away, and at 100 or 300 ft, in copper and aluminum, with NEC 2023 ampacity and voltage drop worked examples.
NEC 2023 · updated Oct 20, 2026