Electrical field tools
Conductors & Raceway
Check conductor, grounding, raceway, box, and wiring installation tasks.
Conductor Sizing & Voltage Drop
Compare conductor ampacity and estimate voltage drop on branch circuits and feeders.
Conductor Ampacity CalculatorApply ambient and conductor-count corrections.Branch Circuit Conductor and Breaker CheckCompare general-load requirements with a conductor and breaker.Copper vs Aluminum Wire Cost CalculatorCompare user-entered material and termination costs for two conductor alternatives.Feeder Conductor Sizing and Voltage Drop CalculatorFind the smallest listed feeder conductor meeting ampacity and voltage-drop targets.Voltage Drop and Wire Size CalculatorEstimate circuit voltage loss and compare listed conductor sizes.Wire Resistance CalculatorEstimate one-conductor and current-path resistance from material, conductor size, length, and temperature.Wire Power Loss CalculatorEstimate I-squared-R conductor losses and annual energy cost for single-phase or balanced three-phase circuits.Parallel Conductor Sizing CalculatorEstimate per-set current and voltage drop for identical parallel conductors.Feeder and Branch Circuit Voltage Drop CalculatorSum estimated voltage drop through feeder and branch-circuit segments using separate load and conductor inputs.
Grounding & Bonding
Look up grounding conductors and bonding jumper sizes.
Raceway Fill & Layout
Check raceway fill, conduit bends, and cable tray capacity.
Cable Tray Fill and Ampacity WorksheetCompare cable area and apply an entered ampacity factor.Conduit Bend CalculatorLay out stub-ups, offsets, and saddle bends.Conduit Offset CalculatorCalculate offset bend marks, spacing, and shrink from obstacle clearance and bender data.Three-Point Saddle CalculatorLay out center and return marks around a conduit obstruction.Four-Point Saddle CalculatorLay out four marks using the selected bender table values and reference convention.Stub-Up Bend CalculatorCalculate a 90-degree stub-up mark from desired height and bender take-up.Rolling Offset CalculatorResolve horizontal and vertical offsets into true offset, rotation, shrink, and marks.Back-to-Back Conduit Bend CalculatorCalculate opposite-end stub marks and remaining spacing from conduit length and take-up.Kick Bend CalculatorCalculate horizontal run and sloped conduit length from required rise and kick angle.Parallel Conduit Offset CalculatorCalculate staggered bend marks for multiple parallel conduit offset runs.Segmented Conduit Bend CalculatorCalculate segment angle, chord, and arc length for a large-radius segmented bend.Conduit Fill CalculatorEstimate raceway fill from conductor count and size.Raceway Fill and Ampacity CalculatorCheck mixed-conductor raceway fill and ampacity adjustments.
Boxes & Cable Pulling
Estimate box volume, pull-box dimensions, and cable-pull conditions.
Box Fill CalculatorEstimate box volume from conductors and devices.Cable Pull Tension and Sidewall Pressure CalculatorEstimate tension and bend pressure along a cable-pull route.Cable Minimum Bend Radius CalculatorCalculate pulling and installed bend-radius limits from cable outside diameter and manufacturer multipliers.Cable Reel Capacity CalculatorEstimate cable length from reel flange, barrel, width, cable diameter, and packing factor.Pull Box and Junction Box Sizing CalculatorEstimate box dimensions for straight, angle, U, and splice pulls.
Wiring & Devices
Review common wiring methods, receptacles, and device markings.
Dwelling Receptacle and Circuit Quick ReferenceReview outlet placement and required branch circuits by room.NM Cable Support and Protection ReferenceCheck cable support, framing protection, and floor passages.Receptacle and Plug Identification ReferenceLook up common NEMA markings, ratings, and grounding contacts.