Electrical takeoff software that counts by type, not by symbol shape.

There is a British Standard for electrical symbols and almost nobody follows it to the letter. BS EN 60617 supplies the vocabulary; what each practice does with it is a house style. One consultant draws an emergency fitting as a filled symbol, the next puts a letter beside it, the third gives it a type code and expects you to go to the schedule. Switched fused spurs, twin sockets and floor boxes all pick up their own local shorthand, and the legend on sheet 1 does not always survive to sheet 12.

A human absorbs that in ten minutes. A symbol-matching tool cannot absorb it at all — it has to be told what every mark means before it counts anything, then told again on the next job, by a different consultant, in a different dialect. That is why symbol-based takeoff feels fast on the second drawing of a series and slow on every first one.

ZeroCount reads the convention rather than matching against a library you maintain, so there is nothing to build before the first count. Where it meets a symbol it has not seen it takes one or two corrections instead of a library update, and there is no per-symbol or per-library charge waiting behind that — unlimited symbols is part of the licence.

A lighting layout rarely carries the detail on the plan. The plan carries type codes — L1, L2, EM1, or whatever this practice uses — and the schedule carries what each code actually is: the fitting, the lamp, the output, the emergency provision, the control gear. Neither document prices on its own. What you price is the join between them: how many of type L4, and what an L4 is.

The split that matters most is emergency. A maintained emergency fitting and the standard fitting beside it are often drawn as the same shape with one extra mark, and they carry different rates, different commissioning and a different test regime. Rolling them into a single luminaire total is not a rounding error — it is the part of the bid the margin comes out of.

ZeroCount counts luminaires by type rather than as one figure: Cat 2 panels, downlights, batten fittings and emergency luminaires come out separately, read off the symbol convention rather than off the outline alone. The schedule still tells you what each type is. The drawing tells you how many, and that is the half that takes the hours.

Small power is where the counting turns tedious. A single socket, a twin socket, a switched fused spur, an unswitched spur, an RCD-protected outlet and a floor box are six rates and, on a busy layout, six near-identical marks. The switch drops do the same: one-gang, two-gang, two-way, intermediate, key switch, retractive. Get the totals right and the variants wrong and the bill is the right size and the wrong money.

Fire alarm and security devices usually share the sheet or arrive as an overlay on it. Smoke detectors, heat detectors, manual call points, sounders and beacons each count as their own line, and on a fit-out they are frequently the fastest-moving part of the drawing between revisions.

ZeroCount counts accessories by variant and devices by category, so what comes back is a breakdown you can price rather than a total you have to unpick first.

Trunking, tray, basket and conduit are measured by the length of the route, and the route is not a straight line between two points. It follows the structure — around beams, over the grid, down the riser, into the board — and the size steps down as it goes, because a run that leaves the panel as 150mm tray is not still 150mm tray at the last drop. One overall length is not a rate line.

Two things a plan view will not give you. Vertical drops and riser lengths are a dimension the plan does not contain, so they come from the sections, from the levels, or from your own allowance. And on a coordinated sheet the containment route has already been negotiated against everything else in the ceiling void — see MEP takeoff for how the mechanical and public health services sharing that drawing are read.

ZeroCount measures containment runs by colour or layer, with lengths broken down by size. The allowance for drops stays your call, made against a measured drawing rather than a scale rule and a memory.

Electrical drawings are dense before anything happens to them. A lighting layout puts several hundred symbols on a sheet and the difference between two of them can be a single stroke. Then the sheet gets printed, marked up in red by whoever was at the design meeting, scanned at whatever the office machine defaults to, and emailed on as a PDF of a photocopy. By the time it reaches a subcontractor pricing the package it is often a photograph of a print pinned up in a site office.

That degradation lands hardest on exactly the marks carrying the information: the annotation next to the socket, the letter inside the luminaire symbol, the type code set in 2mm text. A symbol library assumes crisp vector geometry, and by this point there is none left to match against.

ZeroCount runs vector PDFs, scanned PDFs and photographs of drawings through the same engine. What that does to a 200-dpi scan has a page of its own; the short version is that the messy formats are the point. If there is a drawing sitting in your inbox that your last takeoff package could not make sense of, that is the one to bring to the demo.