For UL 508A panel shops
Send the whole BOM. Get a sourced SCCR back.
Somewhere in your panel is the one component holding the whole rating down. We find it, show you the page it's written on, and tell you what it would take to do better.
No typing parts in one at a time. No drawing your own one-line. No hunting down the same SCCR table you already found last March.
Now inviting a small group of Pacific Northwest panel shops to try it free on a real BOM. Bring a hard one.
| Level | Component | SCCR | Source | Status |
|---|---|---|---|---|
| Feeder | Main disconnect, 100 A | 65 kA | Mfr SCCR table, p. 4 | Verified |
| Branch 1 | VFD, 10 hp, Class J fuses | 100 kA | Mfr tested combination | Pending |
| Branch 2 | Motor starter, 3 hp | 5 kA | Supplement SB default | Default |
| Distribution | Terminal blocks | 10 kA | Supplement SB default | Default |
No published high-fault rating was found for the Branch 2 starter with its branch protection, so the Supplement SB default applies and sets the panel rating.
- Use a starter with a published high-fault rating for the branch fuse class already in the panel.
- Confirm the Branch 1 tested combination so the result can be finalized.
What it does
Takes the whole BOM at once
Email the BOM and the power schematics, messy as they are. Every line gets matched to a manufacturer, a catalog number, and a voltage. You don't retype anything.
Proposes the power circuit
Feeder and branch structure is read from your drawings and handed back for a sanity check. You mark it up instead of drawing it. Nothing is calculated until you say it's right, because a BOM alone can't tell a feeder from a branch.
Cites a source for every rating
Every number points to the table or certification record it came from, with tested combinations, voltage, and fuse class tracked. Where there's no published rating, the Supplement SB default goes in and it's labeled as such, not dressed up.
Explains the result and the fix
The report walks the circuit level by level and points at the component setting your rating. Then it tells you, plainly, what would have to change to hit your number.
Remembers your parts and panels
Each report becomes the design record for that panel. A component verified once stays verified, so the next job with the same parts starts where the last one finished. A web app for shops is in the works.
How the pilot works
Send
BOM in Excel, CSV, or PDF, plus the power schematic pages as PDF. If your shop wants an NDA first, send it over and I'll sign it.
Confirm
I send back the circuit structure as I read it. You spend five minutes telling me where I'm wrong, if anywhere.
Receive
A PDF report and an Excel component log within 5 business days. Usually sooner.
Your MTR stays in charge
A good report makes your MTR's job faster. It doesn't replace your MTR.
Rated Ledger reports support your shop's own SCCR determination under UL 508A Supplement SB. Your qualified staff, typically your UL 508A Manufacturer's Technical Representative, reviews and verifies each report before it is used on a panel or label.
Rated Ledger is a design aid. It does not provide professional engineering services, stamped drawings, or a professional engineer's seal, and a report is not an engineering opinion.
File handling
Your drawings are your business. Here's exactly what happens to them.
- Your BOMs and drawings are used only to prepare your report.
- Files are not shared with anyone outside the service providers named here, and never posted anywhere public.
- Files are stored in a business Microsoft 365 account dedicated to Rated Ledger, and deleted from Rated Ledger storage on request.
- Files are processed with AI tools (Anthropic Claude) under settings that exclude them from model training. Every rating that drives panel SCCR is checked by hand against its source document.
- Please don't send export-controlled (ITAR or EAR) drawings.
- Happy to sign your shop's NDA before you send anything.
About
Rated Ledger is built by Roger Hutchison, an industrial controls engineer and VP of Engineering at an OEM machine builder in the Bellingham, Washington area. He spends his days on PLC and HMI programming, electrical design, and UL 508A panel builds, and got tired of chasing down SCCR ratings, then having to go to Supplement SB anyway. Rated Ledger is an independent venture and is not connected with his employer.
Contact
Questions, or a BOM that's been giving you trouble? Email is the fastest way to reach me.