SIST EN 18122:2026

• Abstract:

  This document specifies safety requirements and test methods for learning towers for domestic use that are intended to raise children to allow them to carry out tasks on kitchen worktops, bathroom sinks, etc. in a standing position.; If the learning tower has additional functions or can be converted into other products, the relevant European Standards may apply.

• Status: Not Published
• Public Enquiry End Date: 01-Nov-2024
• ICS: 97.140 - Furniture
• ICS: 97.190 - Equipment for children
• Technical Committee: POH - Furniture
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 08-Oct-2026
• Due Date: 13-Dec-2026
• Directive: 2001/95/EC - General product safety
• Directive:

  ---

  2023/988/EU - Regulation (EU) 2023/988 of the European Parliament and of the Council of 10 May 2023 on general product safety, amending Regulation (EU) No 1025/2012 of the European Parliament and of the Council and Directive (EU) 2020/1828 of the European Parliament and the Council, and repealing Directive 2001/95/EC of the European Parliament and of the Council and Council Directive 87/357/EEC
• Ref Project: EN 18122:2026 - High chairs and learning towers - Learning towers - Requirements and test methods

SIST EN 18122:2026 is a European Standard (EN) published by the European Committee for Standardization (CEN) for learning towers used in domestic settings. It specifies safety requirements and test methods for products that raise children so they can stand at kitchen worktops, bathroom sinks and similar surfaces. It is aimed at manufacturers, test laboratories, quality teams and buyers that need to judge whether a learning tower fits that use.

What does SIST EN 18122:2026 specify?

SIST EN 18122:2026 specifies safety requirements and test methods for learning towers for domestic use. It is written for products intended to raise children into a standing position so they can take part in tasks at kitchen worktops, bathroom sinks and similar places, and it notes that these products are normally used by children up to 6 years old.

If a learning tower has additional functions or can be converted into other products, other European Standards may also apply. In practice, that means a product team should check whether the tower is only a learning tower or whether another product standard is also needed.

The document is organized into clauses on scope, normative references, terms, general test conditions, test equipment, chemical hazards, thermal hazards, mechanical hazards and product information, followed by one informative annex.

Annex	What it covers
A	Rationales for the scope and the main safety requirements, including the intent behind fall protection, access and egress, one-child use, castors and wheels, entrapment, moving parts and stability

What are the key requirements of SIST EN 18122:2026?

SIST EN 18122:2026 combines laboratory test conditions, hazard controls and user information requirements. The most important points are below.

Test conditions and equipment

• Clause 4 requires the product to be tested as delivered and assembled according to the manufacturer’s instructions. If several configurations are possible, the most onerous one is used for each test. This matters because the tested condition must match the most demanding real use.
• Clause 4 also sets the basic test environment: indoor ambient storage before testing, a test temperature between 17 °C and 27 °C, slow application of static loads, and defined tolerances for force, mass, dimensions and angles. This makes results repeatable between laboratories.
• Clause 5 defines the probes, masses, gauges, clamps, impactors and other equipment used throughout the tests. The document relies on standardised test tools so that openings, entrapment risks, strength and stability are assessed in the same way every time.

Chemical and thermal hazards

• Clause 6 requires migration of certain elements from surface materials to comply with EN 71-3. That means coatings and other accessible materials are checked for chemical safety in a way aligned with child-use products.
• Clause 7 applies to textiles, coated textiles and plastic coverings, and it requires no surface flash when tested with the flame method from EN 71-2. This is the fire-related requirement for the parts of the product that can ignite or flash first.

Fall protection and safe access

• Clause 8 requires guardrails on all sides at the top of the learning tower. The top of the guardrail has to sit high enough above the highest platform position, and the access side must still allow safe entry and exit. In practice, the design has to protect the child from falls without making the product hard to use.
• The access and egress rules also control openings, step or rung width, spacing and depth. These dimensions matter because they affect climbing safety, footing and whether the child can enter the tower without creating new hazards.
• The dimensional rules limit the overall size of the learning tower and the guardrail projection, and they restrict wheels and castors to a form that only rolls when the product is tilted. This prevents the tower from being moved accidentally while a child is using it.

Entrapment, moving parts and other mechanical hazards

• Clause 8 sets finger-entrapment rules using the 7 mm finger probe, the shape assessment probe and the mesh probe. It also covers head and neck entrapment using the torso probe, small head probe, large head probe and the V-shape assessment probe. These checks are meant to stop openings that could trap fingers, heads or necks.
• Foldable learning towers have extra requirements for locking mechanisms. They must not fold in use, must resist incomplete deployment and must withstand repeated locking operation and strength testing. This is important for products that fold for storage or transport.
• Clause 8 also covers compression points, shearing points, entanglement hazards from cords, ribbons and similar parts, and small parts. The small-parts checks use torque and tensile tests followed by the small parts cylinder, so loose pieces cannot become choking hazards.
• Plastic packaging is also controlled for suffocation risk, and accessible edges, points, corners and protrusions must be safe. If the product has projecting parts, they must not create snagging hazards.

Strength, stability and product information

• Clause 8 includes structural integrity tests for the platform and guardrails, using static load, dynamic impact and guardrail load tests. These tests show whether the product can carry the child and stand up to normal use without breakage or detachment.
• Stability is checked on a 10° slope and with loads on the platform and on any step or rung. This matters because a learning tower is only useful if it stays upright when a child climbs or leans on it.
• Clause 9 requires permanent marking, purchase information and instructions for use. The information includes the maker or other product identifier, warnings, the child maximum weight of 30 kg, and instructions that support safe assembly, inspection, cleaning and use.

What terms does SIST EN 18122:2026 define?

SIST EN 18122:2026 defines the key product parts and operating features used in the tests.

• Learning tower - A freestanding product with at least a raised platform and protective components such as guardrails.
• Platform - The part of the product where the child stands during use.
• Guardrail - The top component intended to prevent the child from falling.
• Locking mechanism - The assembly that keeps parts of the product in the position of use.
• Locking device - A component that holds part of the product in the use position, such as a latch, hook or over-centre lock.
• Operating device - The part of a locking mechanism that the carer activates to release or change the product.
• Small parts cylinder - The gauge used to check whether a removed part is a choking hazard.

Who uses SIST EN 18122:2026?

SIST EN 18122:2026 is used by people who design, build, test, certify, buy or review learning towers for domestic use. Manufacturers use it to set dimensions, choose materials and design the guardrails, locking parts and access geometry.

Test laboratories use it to carry out the mechanical, chemical, thermal and small-parts checks. Quality managers and conformity teams use it to verify that production matches the tested design and that markings and instructions are complete.

Buyers, importers and retailers use it to compare products and confirm that a learning tower is intended for one-child domestic use and carries the required user information.

Which standards are used with SIST EN 18122:2026?

SIST EN 18122:2026 relies on three normative references.

• EN 71-2:2020 - provides the flame test used in Clause 7 for textiles, coated textiles and plastic coverings.
• EN 71-3:2019+A1:2021 - sets the migration requirements for certain elements used in Clause 6 for accessible surface materials.
• ISO 48-4:2018 - defines the Shore hardness method used for the rubber layer on the side impactor in the guardrail impact test.

These references matter because they supply the test methods or material requirements that EN 18122 applies directly.

What does the SIST EN 18122:2026 document contain?

SIST EN 18122:2026 contains detailed test hardware descriptions in Clause 5, including finger, torso, head and V-shape probes, test masses, a small parts cylinder, a feeler gauge, a snagging-hazard chain and mass, a loading pad, an impactor, stops, clamps and a side impactor. It also contains the procedures for using that equipment in the hazard tests.

The main test sections in Clause 8 cover falls, access and egress, entrapment, moving parts, entanglement, choking, packaging, edges, protrusions, strength and stability. For a laboratory, that means the document gives the setup and sequence needed to check a learning tower as a product, not just its individual parts.

Clause 9 then turns those safety results into user-facing requirements: permanent marking, purchase information and instructions for use. Annex A explains why the requirements were chosen and how they relate to typical use by young children.

SLOVENSKI STANDARD
oSIST prEN 18122:2024
01-oktober-2024
Otroški visoki stoli - Učni stolpi
Children's high chairs - Learning towers
Kinderhochstühle - Lerntürme
Chaises hautes pour enfants - Tours d’apprentissage
Ta slovenski standard je istoveten z: prEN 18122
ICS:
97.140 Pohištvo Furniture
97.190 Otroška oprema Equipment for children
oSIST prEN 18122:2024 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 18122:2024
oSIST prEN 18122:2024
DRAFT
EUROPEAN STANDARD
prEN 18122
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2024
ICS 97.140; 97.190
English Version
Children's high chairs - Learning towers
Kinderhochst?le - Lernt?me
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 364.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 18122:2024 E
worldwide for CEN national Members.

oSIST prEN 18122:2024
prEN 18122:2024 (E)
Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 General. 6
4.1 Test conditions . 6
4.2 Application of forces . 6
4.3 Tolerances . 6
4.4 Test sequence . 6
5 Test equipment . 6
5.1 Probes . 6
5.1.1 Finger probe . 6
5.1.2 Shape assessment probe . 7
5.1.3 Finger probe for mesh . 7
5.2 Torso probe . 8
5.3 Head probes . 8
5.3.1 Small head probe . 8
5.3.2 Large head probe . 9
5.4 V-shape assessment probe . 9
5.5 Test mass A . 10
5.6 Test mass B . 11
5.7 Small parts cylinder . 12
5.8 Feeler gauge . 12
5.9 Test equipment for snagging hazards . 12
5.9.1 General. 12
5.9.2 Ball chain. 13
5.9.3 Spherical mass . 13
5.9.4 Chain loop and spherical mass . 13
5.10 Loading pad . 13
5.11 Impactor . 13
5.12 Beam for measuring the height . 13
5.13 Stops . 14
5.14 Clamp . 14
5.15 Side impactor . 14
6 Chemical hazards . 15
6.1 Migration of certain elements . 15
7 Thermal hazards . 16
7.1 Requirements . 16
7.2 Test method . 16
8 Mechanical hazards . 16
8.1 Protective function . 16
8.1.1 Hazard from falls . 16
8.1.2 Means of access and egress . 17
oSIST prEN 18122:2024
prEN 18122:2024 (E)
8.1.3 Dimensional requirements . 18
8.1.4 Castors and wheels . 19
8.2 Entrapment hazards . 19
8.2.1 Entrapment of fingers (see A.1). 19
8.2.2 Head and neck entrapment . 19
8.3 Hazards from moving parts . 22
8.3.1 Hazards caused by folding of the product . 22
8.3.2 Compression points . 23
8.3.3 Shearing points . 23
8.4 Entanglement hazards . 23
8.4.1 Requirements . 23
8.4.2 Test method . 24
8.5 Choking and ingestion hazards. 24
8.5.1 Requirements . 24
8.5.2 Test methods for small parts . 24
8.6 Suffocation hazards from plastic packaging . 25
8.7 Hazardous edges, points and corners . 26
8.8 Hazards from protrusions . 26
8.8.1 Requirements . 26
8.8.2 Test method . 26
8.9 Structural integrity . 26
8.9.1 General . 26
8.9.2 Strength of the platform . 26
8.9.3 Strength of the guardrails . 27
8.10 Stability . 28
8.10.1 Requirement . 28
8.10.2 Test method . 28
8.10.3 Step / rung stability . 28
9 Product information . 29
9.1 General . 29
9.2 Marking . 29
9.2.1 Requirements . 29
9.2.2 Durability of marking . 30
9.3 Purchase information . 30
9.4 Instructions for use . 30
Annex A (informative) Rationales . 32
Bibliography . 34

oSIST prEN 18122:2024
prEN 18122:2024 (E)
European foreword
This document (prEN 18122:2024) has been prepared by Technical Committee CEN/TC 364 “High chairs
and learning towers”, the secretariat of which is held by UNI.
This document is currently submitted to the CEN Enquiry.
oSIST prEN 18122:2024
prEN 18122:2024 (E)
1 Scope
This document specifies safety requirements and test methods for learning towers for domestic use that
are intended to raise children to allow them to carry out tasks on kitchen worktops, bathroom sinks, etc.
in a standing position.
Learning towers are normally used by children up to 6 years old.
Note If the product offers other functions other standards can be applied.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 71-2:2020, Safety of toys - Part 2: Flammability
EN 71-3:2019+A1:2021, Safety of toys - Part 3: Migration of certain elements
ISO 48-4:2018, Rubber, vulcanized or thermoplastic — Determination of hardness — Part 4: Indentation
hardness by durometer method (Shore hardness)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp/
3.1
learning tower
freestanding product comprised of at least a raised platform and protective components (e.g. guardrails)
3.2
platform
part of the product on which the child stands during use
3.3
guardrail
component at the top of the product intended to prevent a child from falling
3.4
locking mechanism
assembly consisting of one or more locking device(s) and one or more operating device(s)
3.5
locking device
component that maintains part(s) of the product in the position of use
EXAMPLE Latch, a hook, an over centre lock
oSIST prEN 18122:2024
prEN 18122:2024 (E)
3.6
operating device
part of the locking mechanism(s) designed to be activated by the carer by one or several action(s)
4 General
4.1 Test conditions
The product shall be tested as delivered; it shall be assembled according to the manufacturer's
instructions. If the instructions allow for different adjustments or configurations of components, the most
onerous combination shall be used for each test, unless otherwise specified in the test method.
Fittings shall be tightened before testing in accordance with instructions; further re-tightening shall not
take place.
Unless otherwise specified by the manufacturer, the sample for test shall be stored in indoor ambient
conditions for at least 24 h immediately prior to testing.
The tests shall be carried out at a temperature between 17°C and 27°C.
Before beginning the testing, visually inspect the unit thoroughly and record any defects so that they are
not assumed to have been caused by the tests.
NOTE See Annex A for rationale on tests and requirements.
4.2 Application of forces
The forces in the static load tests shall be applied sufficiently slowly to ensure that negligible dynamic
force is applied.
The tests are described in terms of the application of forces; however, masses can be used. The
relationship 10 N = 1 kg shall be used for this purpose.
4.3 Tolerances
Unless otherwise stated, the following tolerances apply to the test equipment:
— forces: ± 5 % of the nominal force;
— masses: ± 0,5 % of the nominal mass;
— dimensions: ± 1,0 mm of the nominal dimension;
— angles: ± 2° of the nominal angle.
4.4 Test sequence
The tests in Clause 8 shall be carried out on the same learning tower and in the order of the clauses of
this document.
5 Test equipment
5.1 Probes
5.1.1 Finger probe
Probe with hemispherical ends made of plastics or other hard, smooth material, mounted on a force
measuring device, see Figure 1.
oSIST prEN 18122:2024
prEN 18122:2024 (E)
Dimensions in millimetres
Key
1 hemispherical end
2 line around circumference
3 Ø 7 (+0 / - 0,1)
Figure 1 — Finger probe with hemispherical end
5.1.2 Shape assessment probe
Probe made of plastics or other hard, smooth material with the dimensions shown in Figure 2
Dimensions in millimetres
Key
A side view
B top view
C face view
D isometric view
Figure 2 — Shape assessment probe
5.1.3 Finger probe for mesh
A probe with a diameter of 7 (+0 / −0,1) mm, mounted on a force-measuring device, with the end as
specified in Figure 3, made of plastics or other hard, smooth material. The end radius shall be (2,8 ± 0,2)
mm.
oSIST prEN 18122:2024
prEN 18122:2024 (E)
Dimensions in millimetres
Figure 3 — Finger probe for mesh
5.2 Torso probe
Probe made of plastics or other hard, smooth material with the dimensions shown in Figure 4
Dimensions in millimetres
Key
1 handle
Figure 4 — Torso probe
5.3 Head probes
5.3.1 Small head probe
Probe made of plastics or other hard, smooth material with the dimensions shown in Figure 5
Dimensions in millimetres
Key
1 handle
Figure 5 — Small head probe
oSIST prEN 18122:2024
prEN 18122:2024 (E)
5.3.2 Large head probe
Probe made of plastics or other hard, smooth material with the dimensions shown in Figure 6
Dimensions in millimetres
Key
1 handle
Figure 6 — Large head probe
5.4 V-shape assessment probe
Probe made of any material and with dimensions as given in Figure 7.
Dimensions in millimetres
Key
A “A” portion of probe
B “B” portion of probe
B1 Shoulder section – either 25 mm or 45 mm dimension is acceptable
Figure 7 — V-shape assessment probe
oSIST prEN 18122:2024
prEN 18122:2024 (E)
5.5 Test mass A
Rigid cylinder 200 mm in diameter and 300 mm in height, having a mass of 15 kg with its centre of gravity
150 mm above its base. The edges shall have a radius of 5 mm. Two anchorage points shall be provided.
These shall be positioned 150 mm from the base and at an angle of 180° to each other around the
circumference (see Figure 8).
Dimensions in millimetres
Key
1 edge radius: (5 ± 1) mm
2 anchorage points
Figure 8 — Test mass A
oSIST prEN 18122:2024
prEN 18122:2024 (E)
5.6 Test mass B
A test mass of (50 ± 0,5) kg with the dimensions given in Figure 9.
Dimensions in millimetres
Figure 9 — Test mass B
oSIST prEN 18122:2024
prEN 18122:2024 (E)
5.7 Small parts cylinder
A cylinder for assessment of small components, having dimensions in accordance with Figure 10.
Dimensions in millimetres
Figure 10 — Small parts cylinder
5.8 Feeler gauge
A gauge with a thickness of (0,4 ± 0,02) mm and an insertion end radius of (3 ± 0,5) mm (see Figure 11).
Dimensions in millimetres
Figure 11 — Feeler gauge
5.9 Test equipment for snagging hazards
5.9.1 General
The test equipment comprises a ball chain (specified in 5.9.2) attached to a spherical mass (specified
in 5.9.3) the combination of which is given in 5.9.4.
oSIST prEN 18122:2024
prEN 18122:2024 (E)
5.9.2 Ball chain
The ball chain comprises balls distributed along the length of the chain, the diameter of each ball is
(3,2 ± 0,2) mm, the distance between the centre of each ball is (4 ± 0,5) mm see Figure 12.
Dimensions in millimetres
Figure 12 — Ball chain
5.9.3 Spherical mass
A smooth spherical mass of (2,5 ± 0,05) kg and (115 ± 1) mm diameter.
5.9.4 Chain loop and spherical mass
The ball chain loop is formed by the ball chain entering the spherical mass at a common fixing point with
a ball from each side of the chain in contact with each other. See Figure 13.
Dimensions in millimetres
Key
1 ball chain 5.9.2 with length of (200 ± 2) mm
2 spherical mass 5.9.3
3 fixing point
Figure 13 — Loop and mass
5.10 Loading pad
A rigid cylindrical object 100 mm in diameter having a smooth hard surface and edges rounded with
radius of 12 mm.
5.11 Impactor
A cylindrical bag with a diameter of 150 mm filled with steel shot with a diameter of (4 ± 2) mm. The total
mass shall be 23 kg.
5.12 Beam for measuring the height
A beam, 86 mm wide and with a mass of (0,5 ± 0,01) kg.
oSIST prEN 18122:2024
prEN 18122:2024 (E)
5.13 Stops
Stops no higher than 12 mm to prevent sliding.
5.14 Clamp
A (100 ± 5) mm rigid clamp (see Figure 14).
The width shall be adjustable to the thickness of the of the guardrail to which forces are applied.
Dimensions in millimetres
Key
1 clamp
2 centre line indicating direction and position for the application of the force
3 foam, to prevent undue damage
4 top of the guardrail
Figure 14 — Clamp
5.15 Side impactor
A pendulum with a cylindrical head made of steel (Figure 15). The head of the pendulum shall be
surrounded by a 10 mm thick layer of rubber of hardness (75 ± 5) Shore A in accordance with
ISO 48-4:2018. The total mass shall be 2 kg.
oSIST prEN 18122:2024
prEN 18122:2024 (E)
Dimensions in millimetres
Key
1 pivot point
2 centre of gravity
3 rubber (75 ± 5) Shore A
Figure 15 — Side impactor
6 Chemical hazards
6.1 Migration of certain elements
This requirement does not apply to parts of learning towers which, due to their accessibility, function,
volume, or mass, clearly exclude any hazard due to sucking, licking or prolonged skin contact when the
learning tower is used as intended or in a foreseeable way, bearing in mind the behaviour of children.
A separate sample may be used for this test.
The migration of elements from surface materials of the learning tower shall comply with
EN 71-3:2019+A1:2021.
oSIST prEN 18122:2024
prEN 18122:2024 (E)
7 Thermal hazards
7.1 Requirements
A separate sample may be used for this test.
This clause applies only to textiles, coated textiles, and plastic coverings.
Hook and loop fasteners, cords and alike are excluded.
When tested in accordance with 7.2, there shall be no surface flash.
7.2 Test method
Apply the test flame defined in EN 71-2:2020, 5.5 for (3 ± 0,5) s to the product in different places likely
to cause surface flash.
8 Mechanical hazards
8.1 Protective function
8.1.1 Hazard from falls
8.1.1.1 Requirements
The learning tower shall be equipped with guardrail(s) at the top on all sides.
The lowest point of the top of the guardrail shall be at least 450 mm above the highest platform position,
measured vertically in accordance with 8.1.1.2.
The vertical distance between the platform and the guardrail on the side intended to be the means of
access and egress shall not be greater than 700 mm.
8.1.1.2 Test method for the measurement of the distance between the guardrail and the platform
Position the test beam (5.12) across the rim of the guardrail with the 86 mm side in a horizontal position
(see Figure 16).
Measure the minimum vertical distance between the under surface of the beam and the platform (see
Figure 16).
oSIST prEN 18122:2024
prEN 18122:2024 (E)
Key
1 Test beam
h height
Figure 16 — Measurement of the distance between the guardrail and the platform
8.1.2 Means of access and egress
To facilitate a safe access to and egress from the platform, the following requirements shall be met:
a) There shall be no obstructions (e.g. door, sliding or swinging panel or bar) between the top of the
platform and the bottom of the guardrail on the side intended to be the means of access and egress.
b) The product shall not be fitted with any means to restrain the child (e.g. harness system or belts),
with the exception of guardrails.
c) The width of any step or rungs, if present, shall be 240 mm or more.
d) The distance between the upper surfaces of the steps or rungs, if present, shall not exceed 310 mm
when measured vertically; this requirement also applies to the distance between the uppermost step
and the platform and to the distance between the floor and the first step or the floor and the platform
in case no steps are present.
e) The depth of steps on closed step ladders shall be 120 mm or more.
f) The horizontal gap between the rear of one step and the front of the next step or the platform shall
not exceed 25 mm (see Figure 17).
oSIST prEN 18122:2024
prEN 18122:2024 (E)
Key
A distance to be checked (less than 25 mm)
Figure 17 — Examples of steps protruding from the step below
8.1.3 Dimensional requirements
When measured from the ground, there shall be no part of the learning tower above a height of 1000 mm,
on the side intended to be used against the kitchen worktops, bathroom sinks, etc.
The learning tower shall have the following maximum internal dimensions of the guardrail, measured
horizontally:
— width 500 mm;
— depth 400 mm.
The vertical projection of the guardrail shall not extend more than 50mm outside the edges of the
platform (see Figure 18).
Picture 1: PASS vertical projection of the guardrail
within the area of the platform

Picture 2: PASS vertical projection of the guardrail
within 50mm outside the area of the platform
oSIST prEN 18122:2024
prEN 18122:2024 (E)
Picture 3: FAIL vertical projection of the guardrail not within 50mm outside the area of the
platform
Key
Grey square platform area
Black br
...