Electrician's Field Guide

Ohm's Law, voltage drop, conduit fill, and much, much more! Electrician's Field Guide puts the calculators and reference charts you reach for on the job in your pocket. Built for electricians. It works offline, with no account, no ads, no subscription and no tracking. SEVEN CALCULATORS • Circuit Calculator: You tell us the amps, we calculate the breaker, conductors, equipment grounding conductor and raceway size! • Motor Calculator: Select a motor HP to see full-load current, breaker or fuse, wire, ground, raceway and starter size! • Transformer Calculator: Pick a transformer size and we give you the overcurrent protection, conductors, grounding and raceway for delta-wye transformers. Not sure what size transformer you need? Tell us your required load size and our app will do the rest! • Voltage Drop: Find voltage drop for your circuit, the maximum circuit length for existing runs, or see minimum conductor size you need for your distance! • Conduit Fill: See your conduit fill as percentage, view jam ratio and recommended conduit size for your setup! • Ohm's Law: Solve for voltage, current, resistance or power, with a built-in formula wheel! • AC Power & Amps: Need more than Ohm's law? Calculate any circuit single-phase or three-phase and see things like amps, watts, VA, VAR and power factor, all in one calculator! SEE THE WORK BEHIND THE NUMBERS Our calculators show a "How this was calculated" breakdown for every result, so you can follow the steps, see the code table each number came from, and check the results for yourself. REFERENCE CHARTS Choose your conditions and get the value you need: conductor ampacity, grounding and bonding conductor sizes, motor full-load current, protective device ratings, transformer protection, and support spacing for conduit and cable. Each chart shows the answer with the notes that apply. TWO TOOLBOXES Motors: easy to read motor connection charts and a guided winding test for 9-lead motors, with clear diagrams. Pull and junction boxes: add your conduits to the box, and the app gives you the minimum box dimensions, with an illustrated guide to how pull box sizing works. BUILT FOR THE FIELD • Works with no internet: nothing to download or sign in to • One purchase: no subscription, no in-app purchases, no ads • Light and dark mode follow your phone • No accounts, no ads, no tracking Based on the 2023 National Electrical Code (NEC). IMPORTANT Electrician's Field Guide is a reference aid. It does not replace the NEC, your local requirements or your judgment. Always verify results against the current code and with your local authority having jurisdiction. The developer is not responsible for inaccurate calculations.