The arm out of the room

On 10 May 2024 Nexaro put this headline on its own newsroom page:

"Nexaro NR 1500 is the world's first compact vacuum robot to meet the latest safety standard for commercial cleaning robots – TÜV Süd confirms compliance with IEC 63327."

The body is as specific. Compliance with the standard and with the Machinery Directive 2006/42/EC "has been tested and confirmed by the independent testing body TÜV Süd", and certification "enables the Nexaro NR 1500 to bear the renowned GS test mark". We read the page on 11 September 2026. That is what a true standards claim looks like: a named machine, a named standard, a named testing house, a mark you can ask to see.

Now open the standard it names. IEC 63327:2021, Automatic floor treatment machines for commercial use — Particular requirements, Edition 1.0, published 4 May 2021, 75 pages, TC 61/SC 61J, CHF 260. Clause 1 is headed Scope, and inside it sits a list of dashed bullets under one governing sentence: "This standard does not apply to". Four consecutive bullets decide this category (clause type: Scope):

"– appliances for medical purposes (IEC 60601-1); – driverless industrial trucks and their systems (ISO 3691-4); – robots and robotic devices: Safety requirements of personal care robots (ISO 13482) – machines with parts that extend beyond the contact zone of the machine;"

Those are the twelfth to fifteenth dashed bullets. You need not buy the standard to check them: IEC reproduces the Scope and the exclusion bullets on its free catalogue page, webstore.iec.ch/en/publication/62787. We read it there on 11 September 2026 and again on 12 September 2026, against the publisher's preview PDF from a different host. The two bullet lists are character-identical down to the inconsistent punctuation: the missing semicolon after the ISO 13482 bullet, the full stop mid-list after "ships or aircraft". What the free page does not carry is the standard's interleaved NOTEs, NOTE 102 among them. Those are quoted here from the preview PDF; a reader checking the catalogue page alone will not find them there.

The last of those bullets is the argument of this article. What proves it bites is not that nobody uses the standard. The reverse: named machines are certified against IEC 63327 by named testing houses, and every one we could find stops at the floor, while every restroom machine with an arm we could find, ours included, claims no conformity at all.

Carry one thing through: Edition 2.0 of IEC 63327 is under development, at stage TCDV, forecast publication 16 April 2027, from the lifecycle payload on that same catalogue record [primary, single source]. Edition 1.0 remains in force with no amendment. What Edition 2.0 changes we could not read — its catalogue page returns 404 and both forms of the IEC projects portal returned an empty body. Everything below is the 2021 text.

Clause 1, Scope — the governing sentenceclause type: Scope. "This standard does not apply to"

The list, in document order

• – vacuum cleaners and water-suction cleaning appliances and automatic battery-operated cleaners for household use (IEC 60335-2-2);
• – floor treatment machines and wet scrubbing machines for household use (IEC 60335-2-10);
• – battery chargers (IEC 60335-2-29);
• – floor treatment machines for commercial use (IEC 60335-2-67);
• – spray extraction machines for commercial use (IEC 60335-2-68);
• – road sweepers;
• NOTE 101In Europe, the EN 17106 series covers road sweepers.
• – machines designed for use on slopes with a gradient exceeding 20 %;
• – machines equipped with a power take-off (PTO);
• – machines designed for use in corrosive or explosive environments (dust, vapour or gas);
• – machines designed for use in vehicles or on board of ships or aircraft.
• – vacuum cleaners designed for pickup of combustible dust;

The four that decide this category

• – appliances for medical purposes (IEC 60601-1);
• – driverless industrial trucks and their systems (ISO 3691-4);
• – robots and robotic devices: Safety requirements of personal care robots (ISO 13482)
• – machines with parts that extend beyond the contact zone of the machine;
• NOTE 102Components of the machine that operate outside the contact zone can be evaluated differently. — It sits here, immediately after the bullet above and still inside clause 1. That it follows the bullet rather than qualifying the governing sentence, and that it addresses how components may be evaluated rather than whether a machine is in scope, is our reading [inference].

The last bullet, and the trailing NOTEs

• – machines designed for picking up liquids with a flash point below 55 °C.
• NOTE 103The flash point temperature limit can vary in different countries. National regulations will need to be taken into account.
• NOTE 104Attention is drawn to the fact that in many countries additional requirements on the safe use of the equipment covered can be specified by the national health authorities, the national authorities responsible for the protection of labour, the national water supply authorities and similar authorities.

• A dashed bullet of the exclusion list, verbatim
• The four consecutive bullets that decide this category

A note does not widen a scope, and one step here is ours

Directly after the contact-zone bullet, still inside clause 1, the standard says this (clause type: note):

"NOTE 102 Components of the machine that operate outside the contact zone can be evaluated differently."

That sentence is where a standards slide usually recovers. It should not. A note is informative; it follows the bullet rather than qualifying the sentence "This standard does not apply to"; and it addresses how components may be evaluated, not whether a machine is in scope [inference]. We looked for something saying otherwise and found nothing — no interpretation sheet, corrigendum or maintenance document on the catalogue record, none in the preview's Foreword or Introduction. The bound is "none is published on the catalogue record"; a sheet circulated only to national committees would be invisible to us.

The phrase the bullet turns on is defined two clauses deep, at 3.215 (clause type: definition):

"contact zone — boundary in which the machine is assumed to be in contact with the object, and the allowable motion of the machine could be hazardous at that boundary" "Note 2 to entry: Hazardous exposed moving side brushes are included in the contact zone."

A definition does interpretive work, not normative: it says what the phrase in the Scope bullet means, and nothing more. Which brings the sentence this article stands on. We would rather write it than have a competitor's safety engineer write it for us. IEC 63327 nowhere says that a manipulator arm is a "part that extends beyond the contact zone." That is our reading [inference], and the one place this argument can be pushed.

What is not ours: the contact zone is a boundary at which the machine is assumed to contact the object, Note 2 to entry places side brushes inside it, and a machine whose arm reaches a mirror, a cistern or a door handle works at surfaces that boundary does not describe. A strong reading, and still a reading.

One more feature of clause 1, because it is how a careful reader gets this wrong. On page 6, among the scope-setting paragraphs, the Scope points at an annex for machines with no manual mode: "Modified requirements are given in Annex FF of this standard for automatic floor treatment machines not equipped with a manual mode." The exclusion bullet is on page 7. Annex FF is named one page-turn before the sentence that writes an arm-bearing machine out: stop at the first and the standard appears to have an annex for your machine, read one page on and you have the mechanism. Clause 4 names Annex FF again (clause type: requirement) and states it is normative. The preview ends at clause 7.7, so we have read the annex's title and status and not a word of its content.

Who holds a certificate, and what those machines have in common

Four machines in this category publish an arm, or something that can only be an arm. The table below quotes each from its own page, read on 11 September 2026. Primech's Hytron, in Primech's own words: "Equipped with an extendable robotic arm, this device can reach every corner of the toilet bowl and seat". Hivebotics publishes "6 DOF Robot arm" for the Abluo Mark 2, and no values under its other specification headings, so the rest is not published. Somatic's BCR spec sheet sits on getsomatic.com because somatic.ai now redirects to a parked domain-for-sale page. Loki Robotics never uses the word, and we quote what it does publish rather than upgrading it.

None of the four publishes a conformity claim. On 11 September 2026 we read every page of primech.ai reachable from its own navigation, plus the linked spec deck, for "IEC", "63327", "certif", "conform", "complian", "standard", "TÜV", "UL" and "CE": nothing, and the word "standards" appears only as marketing. hivebotics.tech/AblueMarkII, getsomatic.com with the BCR spec sheet, and lokirobotics.co returned none. A web search across all four vendors and the string "IEC 63327" returned ten vendor and trade-press results and not one certification claim. We do not know what is in anyone else's safety file, and nothing here says these machines cannot be certified. We searched the vendors' own material and TÜV Rheinland's Certipedia — which on 12 September 2026 held no product attestation for any of the four — and not the other certifiers' databases.

Now the other half, which makes the clause reading survivable. Three floor machines claim conformity, each from the vendor's own material. Nexaro's NR 1500, above: TÜV SÜD, the Machinery Directive, the GS mark, 10 May 2024. Gausium's Scrubber 50 M series, on its news page of 1 February 2024, "secured the EU CE-MD Certificate from TÜV Rheinland… aligning with the EN IEC 63327 standard", certificate dated 31 January 2024. Kärcher's KIRA B 50, in Kärcher's own 32-page brochure under the heading "Safety certifications": "■ Safety-certified in accordance with IEC 63327".

A compact vacuum robot, a scrubber and a scrubber drier. None of the three has a part that extends beyond the contact zone [inference — the same reading of clause 1 with clause 3.215, running the other way]. They are the machines clause 1 describes, doing the applications clause 1 lists — a list the standard closes with two words on their own line: "of floors". The route works. The clause sorts. That disposes of the easiest objection to everything above: that we read the Scope harder than the industry does. Somebody takes it seriously. Two of the largest third-party testing houses have issued against it.

None of that is a discovery: the standards-scope article documented the same mechanism for a wheeled mobile manipulator and for a biped, and C1 is the third machine of ours to land in it. Nor is the compression ours alone. Gausium's guide to commercial cleaning robot safety, dated 12 March 2024, summarises IEC 63327's coverage accurately and mentions neither the exclusion list, the contact-zone bullet nor NOTE 102, while linking to the page that reproduces all three. Stated, not adjudicated — our own page read the same way until we fixed it.

Machines in this category that publish an arm, or something that can only be an arm.

Machines that publish a conformity claim against IEC 63327.

The contrast between the two blocks is the finding, and the empty column is the figure. The upper block's last column is empty because we found nothing to put in it: on 11 September 2026 we read every page of primech.ai reachable from its own navigation plus the linked spec deck, hivebotics.tech/AblueMarkII, getsomatic.com with the BCR spec sheet and lokirobotics.co, searching for "IEC", "63327", "certif", "conform", "complian", "standard", "TÜV", "UL" and "CE", and ran a web search across all four vendors with the string "IEC 63327". Not stated is not the same as no. Nothing here says any of these machines is unsafe, non-conforming or incapable of being certified; we do not know what is in anyone else's safety file, and the search covered vendor material and TÜV Rheinland's Certipedia, not the other certifiers' databases. That the parts quoted in the third column are "parts that extend beyond the contact zone" within the meaning of clause 1 is our reading of that clause and of clause 3.215 together — IEC 63327 nowhere says that a manipulator arm is such a part [inference] — and the same mark carries the reading that the three lower machines have no such part. No machine of ours appears in either block, and a conformity relation between this standard and a machine of ours is not ours to draw.

What the document is good for when it is not a route

An excluded standard is not a useless one. IEC 63327 carries the best-evidenced published requirements for the wet floor-treatment part of this job, and a safety file can cite them as evidence where the scope reaches no machine:

Two of those rows sort this category without a number of ours. Both arm-bearing restroom machines whose dimensions we could find are type 2 machines, on their makers' own figures: Primech's deck gives Hytron 1311 mm and 128 kg, either of which alone breaks clause 3.202, and Somatic's sheet gives the BCR 43 in and 275 lbs. A cubicle is a confined space by construction under clause 3.217 around machines of their published widths — Somatic's 16.5 in, Primech's 409 mm [inference: we publish no cubicle dimension, and clause 3.217 measures from the machine transport width to the nearest continuous wall or obstacle, parallel to the direction of motion].

The shared normative references, named as references and never as certificates: IEC 60335-1:2020 including Annex R, IEC 60335-2-69:2021, IEC 60335-2-72:2021, IEC 61032, IEC 61058-1, IEC 61770:2008, IEC 62061 by way of normative Annex JJ, ISO 13849-1, ISO 13857:2019, ISO 18646-1:2016 and ISO 13856-3. ISO 12100:2010 is the type-A base of our file and is not in that list; running the two together would imply the standard prescribes a route it does not. Clause 4 also carries the requirement on remote operation, which is another article's subject.

One regional note. China's GB/T 46495—2025, announced 3 November 2025 and effective 1 May 2026, is scoped on the State Council's page by environment — malls, hotels, office buildings, car parks — and grades five cleaning functions that are all floor functions, but its own scope clause is not free, so whether it reaches a machine with an arm cannot be read from a primary source.

Our own page, twice

Until 11 September 2026 the cleaning vertical page put IEC 63327 on the certification side of its own diagram. We read clause 1 properly and moved it — and the replacement text we published that day reversed the ordering inside clause 1, putting Annex FF's first mention a few lines after the exclusion bullet. It is one page before it. That second error shipped inside the correction, in two locales, and we fixed it on 12 September 2026 in commit 58d8ad2, along with the same sentence in the safety register. Both are checkable, which is the only reason to write it down.

What replaces the lane is not another certificate. It is a safety file built from ISO 12100 upward, the references named, each clause above cited as evidence for the hazard it best covers, and an empty space where a certificate would go. C1 is in development; nothing is built and nothing has been measured. Every row of our published safety register reads in-design, not-started or not-applicable, and IEC 63327's is the last of those.

The question for a procurement officer holding a standards slide is not whether the vendor names IEC 63327; three companies name it correctly and hold something for it. It is which machine the certificate was issued against, whether that machine has a part reaching past the floor, and — with Edition 2.0 forecast for 16 April 2027 — whether today's answer is the one the standard will give in two years.