This week we launched something we have been working on quietly for the past few months: a free toolkit for NJ electricians, contractors, homebuyers, and homeowners. Five calculators and design tools, an AI code assistant, and a 20-article NEC reference library — all written and built by our team and free to use forever, no signup required.
Here is what is now live at malfettonegroup.com/tools, what each piece actually does, and why we built it.
Why Build a Toolkit for Free?
I have been pulling permits in Hudson and Essex County since I was old enough to drive a service truck. My father started Malfettone Electric in 1977, and our shop has lived through three NEC code cycles, two utility consolidations, and the rise of EV chargers, smart panels, and residential solar. In all that time, the tools available to working electricians have changed surprisingly little: spreadsheets for load calculations, hand sketches for single-line diagrams, fee-paid SaaS subscriptions for the rest.
That gap is the reason we built this. A homeowner who wants to know whether their panel can handle a Tesla Wall Connector should not have to pay $45 a month to find out. An electrician quoting a panel upgrade should not have to recreate the same load calculation from scratch on every job. And a contractor who wants to verify an NEC requirement should be able to ask a plain-English question and get a cited answer in under a minute.
We built the toolkit we wanted ourselves. Then we made it free.
The Five Tools
Residential Load Calculator
The Residential Load Calculator implements both the NEC Article 220 Standard method and the Optional method. You enter the square footage, fixed appliances, HVAC, and EV charger details — the calculator runs both methods, applies the correct demand factors and continuous-load multipliers, and recommends a service size. Every line cites the NEC article it comes from. Branded permit-ready PDF export with one click.
NJ-specific defaults are baked in: the 125% continuous-load multiplier for EV chargers per NEC 625.42, the 5,000 VA dryer minimum, the standard household range demand factors. We use this same calculator on every panel-upgrade quote we write.
Voltage Drop Calculator
The Voltage Drop Calculator is the tool every electrician needs in their pocket on long EV charger runs and feeders. Copper or aluminum, 14 AWG through 750 kcmil, single- or three-phase, with NEC 3% and 5% recommendation checks live as you type. When the drop exceeds 3%, the calculator suggests the next conductor size up that solves it.
Conduit Fill Calculator
The Conduit Fill Calculator handles the NEC Chapter 9 fill rules for EMT, IMC, RMC, PVC Schedule 40, and PVC Schedule 80 with THHN/THWN-2 conductors. It is especially useful in Hudson County where local AHJs require conduit for residential branch circuits — Jersey City, Hoboken, and Bayonne all have local amendments mandating conduit even where the NEC would allow Romex. Quick presets for common circuits (15A, 20A, 50A EV, 60A EV, 200A feeder) get you to the right trade size in under 5 seconds.
Panel Schedule Builder (with AI photo reader)
This is the tool we are most excited about. The Panel Schedule Builder generates a fully-formatted, permit-ready panel schedule with NEC 240.4(D) compliance flagged on every row. Every breaker amperage gets checked against the small-conductor rule live as you type — 14 AWG cannot exceed 15A, 12 AWG cannot exceed 20A, 10 AWG cannot exceed 30A. Catches mistakes before they reach inspection.
The AI feature: snap a photo of an existing panel and Claude vision pre-fills the entire schedule. Manufacturer, main breaker amperage, total spaces, and every detected circuit position with confidence scoring. Not a replacement for human verification — but it turns 20 minutes of typing into 90 seconds of review.
Single-Line Diagram Builder (Beta)
The Single-Line Diagram Builder ships with four pre-built templates covering the most common NJ residential jobs: 200A panel upgrade, EV charger add to existing panel, whole-house generator with ATS, and solar PV with line-side tap per NEC 705.11(D). Edit the labels, export a branded permit-ready PDF. Currently in Beta — output is permit-ready in concept but the layout engine is still being refined. We are upgrading to a full-canvas drag-drop editor in the next phase.
The NEC Code Chatbot
The NEC Code Chatbot is something I am genuinely proud of. Ask any plain-English question about NEC code — "what size breaker for a 48A EV charger," "do I need a separate ground rod and water-main bond on a 200A service," "is Romex allowed in a Jersey City basement" — and you get back an answer cited to the specific NEC article, with NJ-specific context (PSE&G, JCPL, Hudson County permit reality) baked in.
It draws from a library of 20 original NEC code guides we wrote ourselves, covering Articles 110, 210, 220, 230, 240, 250, 310, 314, 334, 348, 358, 406, 408, 422, 625, 690, 702, and 705.11(D). Each guide is also available as a standalone reference page in our Code Reference Library.
The chatbot is not a replacement for a licensed electrician on a real job — and we are explicit about that in every answer. But for a homeowner trying to understand a permit requirement, an apprentice studying for the journeyman exam, or a contractor verifying a code interpretation in the field, it is a faster, more useful answer than scrolling through a PDF copy of the code book.
What is Next
This is Phase 2 of a longer roadmap. Phase 3 will add a proper drag-drop single-line diagram editor (replacing the current template-based approach), more NEC reference articles (target: 40+ guides covering every major article a residential electrician encounters), and an NJ permit packager that auto-fills the F120 electrical subcode application from your load calc and SLD.
If you have ideas for tools you would use, code questions you want covered in the chatbot, or features you wish existed but do not — drop us a note at our contact page. We are building this for the working NJ electrical community first.
And if you need actual electrical work done in Hudson, Essex, or Bergen County — the same expertise that built these tools is on the truck. Free virtual estimates, licensed and insured, family-owned since 1977. Get in touch.