From drawing to quotation: AI-assisted BOMs for electrical panel shops

In most panel shops the slowest part of winning an order is not the negotiation. It is the hours between receiving a drawing and sending a price. An estimator opens the single-line diagram, lists every breaker, contactor, relay, meter and busbar, looks up current prices, adds enclosure, wiring and labour, applies margin and finally types it all into a quotation. Do that for several enquiries a day and the backlog grows faster than the team.

AI can now take a real share of that work. This article explains what an AI-assisted BOM actually does, where it needs a person, and how the reviewed BOM flows into a quotation without being retyped.

What “AI BOM” should mean

The phrase gets used loosely, so it helps to be precise. An AI-assisted BOM workflow has four parts:

1. Reading the input. The AI looks at a drawing (PDF or image), a photo of an existing panel or a plain-English specification, and lists the components it can identify, with ratings and quantities.
2. Matching to your catalogue. Each component is compared with the products you actually stock and buy, so the BOM uses your item codes and your prices.
3. Showing confidence. Every line is marked as matched, needing review, or having no match. This is the part that makes the output usable.
4. Handing over to a person. The estimator checks the uncertain lines, fixes anything wrong and confirms the BOM. Nothing is quoted until that happens.

If a system skips the third or fourth step and presents AI output as a finished BOM, treat it with caution.

Why the review step is not optional

Panel drawings are dense and inconsistent. Shops use their own abbreviations, legends vary between consultants, and a scanned drawing may be partly unreadable. A symbol for a 4-pole MCB and a note saying “4P” can be confused with a quantity of four. Two breakers with similar names can have different breaking capacities.

A sensible AI approach handles this by being conservative:

• Electrical specifications outrank text similarity. If the poles, current rating, voltage or other ratings do not agree, a catalogue item should not be treated as a match, however similar the description looks.
• Uncertain lines are flagged, not guessed. A “needs review” line shows candidate products for the estimator to choose from, rather than silently attaching one.
• Unmatched lines stay visible. If the AI finds a component you do not carry, you see it, so it is not quietly dropped from the price.

The estimator’s job changes from typing every line to checking the lines that matter. That is a better use of an experienced person, and it keeps responsibility for the price where it belongs.

Three ways in: drawing, photo or spec

Panel enquiries arrive in different forms, and each suits a slightly different route.

From a drawing

Upload the PDF or image of the drawing. The AI lists the components it finds and matches them against your catalogue. This is the most common route for consultant-specified work.

One practical note: CAD files in DWG or DXF format need to be exported to PDF before analysis. Most CAD tools can do this in a few clicks, and a clean vector PDF usually reads better than a scanned print.

From a photo of an existing panel

Retrofit and replacement enquiries often arrive as a phone photo of the old panel. Photo analysis produces a structured component list that can be priced across brand tiers, for example a low, mid and premium option. That lets you send a customer a choice instead of a single number.

From a plain-English specification

Some enquiries are just a paragraph: “APFC panel, 300 kVAr, 6 steps, with detuned reactors.” A specification-driven route turns that description into a draft BOM, ideally starting from a panel template so that the standard items are not forgotten.

Measuring and counting on the drawing

For larger panels, it can help to trace and measure directly on the drawing, count components with AI detection and turn that takeoff into a BOM. This suits estimators who prefer to work visually.

From reviewed BOM to quotation

Once the BOM is confirmed, the quotation should come from it directly. In practice that means:

• Prices come from your price lists, which in turn come from supplier lists you have imported, so you are not quoting on old rates.
• Charges and margin are applied consistently, for example enclosure, wiring, labour and your target margin.
• GST is calculated per line, with HSN codes and the correct CGST/SGST or IGST split for the customer’s location.
• Lines with no price are caught before the quote goes out. A missing-price check stops a ₹0 line reaching the customer.
• The quotation is sent from the system, by print, email or WhatsApp, and stays filed against the lead.

When the customer accepts, the same quotation converts into a sales order and the BOM carries through to purchase and production. Nobody rebuilds it.

A realistic workflow for a panel shop

Here is how a typical enquiry might move, with the person responsible at each step.

Step	What happens	Who
1	Enquiry logged as a lead with the drawing attached	Sales
2	AI reads the drawing and drafts the BOM	System
3	Review-flagged and unmatched lines checked and corrected	Estimator
4	Brand tier, charges and margin applied	Estimator
5	Quotation generated with GST and checked for missing prices	Estimator
6	Quotation sent by email or WhatsApp	Sales
7	Accepted quote converted to a sales order	Sales

The human steps are deliberate. The system speeds up the reading and arithmetic; people own the decisions about what goes into the panel and what it costs.

Common pitfalls

• An untidy catalogue. Matching is only as good as your product master. Duplicate items and vague descriptions lead to more “needs review” lines. A short clean-up before you start pays off quickly.
• Stale supplier prices. If price lists are not kept current, a fast quotation is simply a fast wrong quotation.
• Skipping review under pressure. The temptation is strongest on busy days, which is exactly when mistakes are most expensive.
• Expecting the AI to design the panel. It reads what is on the drawing. It does not decide what should be there.

Where Zaptiz fits

Zaptiz Electrical includes a drawing analyser for PDF and image drawings that marks every line matched, needs review or no match, so you confirm before anything is used. Photo analysis prices an existing panel across low, mid and premium brand tiers. The BOM Generator has panel templates such as DB, MCC, APFC, VFD and AMF with brand tiers, charges and margin, and Quote Studio turns an enquiry, whether text, photo or drawing, into a costed draft BOM and quotation. The Panel Design Studio lets you trace, measure and count components on a drawing and turn the takeoff into a BOM.

Quotations carry per-line GST and discounts, a missing-price guard and a choice of print layouts, and can be sent by email or WhatsApp. Read more about how Zaptiz approaches AI on the AI page, or follow the step-by-step guide, Drawing or photo to BOM to quotation in Zaptiz Electrical.