Single-Line Diagram Builder
Pick a template, edit the labels, export a branded PDF. Covers the four most common NJ residential jobs: 200 A panel upgrade, EV charger add, whole-house generator with ATS, and solar PV with line-side tap.
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Frequently asked questions
What is a single-line diagram?
A single-line diagram (also called a one-line) is a simplified electrical drawing that shows the path of power through a system using one line to represent multiple conductors. It depicts the utility source, meter, main disconnect, panels, sub-panels, major loads, and grounding. NJ AHJs typically require an SLD on permit packets for new services, panel upgrades, EV chargers, generators, and solar tie-ins.
Why a template builder instead of free-form drawing?
On 95% of NJ residential jobs the topology is identical — utility → meter → main → panel → loads. What changes is the labels: panel manufacturer, breaker amperage, conductor sizes, generator model. A template-driven builder ships immediately, edits faster than CAD, and produces output AHJs read at a glance. Free-form drag-drop is on the roadmap for the rare custom topology.
Which templates are included?
Four templates cover the most common NJ residential SLD use cases: 200 A panel upgrade with utility transformer and grounding electrode system, EV Level 2 add-on with 125% continuous-load callout per NEC 625.42, whole-house standby generator with automatic transfer switch, and solar PV with line-side / supply-side tap per NEC 705.11(D).
Will NJ AHJs accept this on a permit submission?
Yes. The exported PDF includes a proper title block (project name, address, prepared-by, date, sheet number) and is laid out in a format NJ residential AHJs read every day. Malfettone Electric uses this engine internally on Hudson and Essex County permit packets. As with any AHJ submittal, your final installation must be reviewed and stamped by a licensed electrician of record.