Mike Holt Enterprises produces widely respected NEC training materials, textbooks, DVDs, and online courses used by electricians preparing for licensing exams and continuing education.
| Feature | Mike Holt Enterprises | SparkShift |
|---|---|---|
| Price | Paid courses and books | Free calculators |
| Primary use case | NEC training and exam prep | Field calculations and code reference |
| NEC editions | Varies by course edition | 2017, 2020, 2023, 2026 |
| Interactive calculators | No (reference materials) | 40+ live calculators |
| 3D conduit bending | No | Yes |
| No sign-up required | Account required for courses | Yes — open access |
Mike Holt Enterprises information is based on publicly available sources as of 2026. For the most current pricing and features, visit https://www.mikeholt.com.
The calculators most relevant to what Mike Holt Enterprises users typically need. All free, no sign-up.
No — they serve different purposes. Mike Holt's materials are excellent for learning NEC theory and preparing for licensing exams. SparkShift is a calculation tool for daily field use. Most electricians benefit from both.
SparkShift calculations use the same NEC tables and formulas as any correct hand calculation. For exam prep or learning the code reasoning, Mike Holt's explanations provide the 'why' behind the numbers that a calculator alone cannot.
SparkShift is primarily a field calculation tool, not an exam study platform. It does include an NEC code reference section and a test-prep module for Journeyman and Master Electrician exams, but it is not a substitute for a dedicated study program.
Yes. SparkShift Pro subscribers can export calculation results as PDF reports, which can be useful for project documentation or study notes.
40+ NEC calculators in your browser. Wire sizing, conduit fill, voltage drop, dwelling loads, conduit bending with live 3D, arc flash, EV chargers, solar PV, and more.