To read a ladder's load rating correctly, check three things: the duty rating or class marking, the stated safe working load (SWL) or working load limit, and whether that figure already includes tools and materials, not just body weight. Get any one of these wrong and the ladder may be unsuitable for the job, even if it looks strong enough for the task at hand.
When a ladder specification says "Class 1", "EN131", or "SWL: 115 kg", it is giving us useful safety information, but those terms do not all mean the same thing. One may describe a commonly referenced ladder classification, another may indicate that the ladder has been designed and tested against a recognised standard, while the safe working load tells us how much total weight the ladder is intended to support.
For anyone buying, specifying, or checking access equipment in an industrial or commercial workplace, understanding the difference matters. A ladder duty rating is not simply a marketing label. It helps us match equipment to the people, tools, materials, working position, and frequency of use involved in the job. In this guide, we explain the key terms in plain English and show how to interpret working load figures for our range of aluminium ladders. This article focuses specifically on the EN131 and Class 1 terminology, which is a different classification system from the ANSI duty-rating table discussed in How to Choose the Right Ladder.
01
Duty rating / class
What level of work and loading the ladder is designed for
02
EN131 / certification
Whether the ladder has been tested against a recognised design and construction standard
03
SWL / working load limit
The maximum total load, including tools and materials, not just body weight
04
Task fit
Whether the rating matches the height, configuration and frequency of the planned work
On this page
Section 01
What a Ladder Duty Rating Actually Tells You
A ladder duty rating indicates the level of work and loading for which a ladder has been designed. In practical terms, it helps us decide whether a product is appropriate for occasional light access, routine trade work, or more demanding industrial use. The rating should be considered alongside the ladder's safe working load, construction, configuration, height, condition, and the manufacturer's instructions.
The important point is that a duty rating is not permission to use a ladder in any way we choose. It does not remove the need for a stable base, suitable footwear, three points of contact where practicable, correct setup, and a task-specific risk assessment.
When we see a rating on a specification sheet, we should ask three questions: what classification or standard does the rating refer to, what is the stated maximum safe working load, and does the product suit the planned work environment and configuration. These questions prevent a common mistake: treating a class name as if it were a complete safety guarantee.
Action
Check the ladder's label or spec sheet for three things: the stated classification or standard, the maximum SWL, and the manufacturer's configuration instructions. If any one is missing, do not assume the ladder is safe for the load.
Allow two minutes
Section 02
Class 1, EN131: What's the Difference
Ladder class 1 is a commonly referenced classification associated with more demanding professional or industrial use, particularly in UK-oriented product terminology. On its own, the words "Class 1" do not tell us the product's maximum load, height, configuration, or permitted task. The classification is meaningful only when read together with the manufacturer's technical information and the relevant test or certification documentation.
The EN131 ladder standard is a European standard used in ladder specifications and product conformity information. In general terms, EN131 sets requirements relating to ladder design, construction, dimensions, performance, and testing, so it is broader than a simple statement of how much weight a ladder can support.
We should not present Class 1 as South Africa's current mandatory ladder standard without a confirmed local compliance framework, and the available information for this article does not confirm EN131's regulatory status as a mandatory South African framework either. Treat both as commonly referenced classifications pending confirmation, not as legal requirements.
EN131 compliance and a duty rating answer different questions. EN131 concerns whether the ladder meets defined requirements for design and testing. A duty rating communicates the level of use or load for which the product is intended. A ladder may be tested against a standard and still have a specific SWL that must not be exceeded, so we need both pieces of information when specifying access equipment.
Action
Before treating any duty rating as sufficient on its own, ask for the manufacturer's test or certification documentation alongside the stated SWL.
Allow two minutes
Section 03
Reading the Numbers: SWL and Working Load Limit
The working load limit is the maximum total load the ladder is intended to support during the permitted use described by the manufacturer. SWL commonly means "safe working load", which is the practical swl meaning most buyers need when reading a product label or specification sheet. Weight ratings come from the manufacturer's design information and testing, not from the ladder's physical size, so a tall or wide ladder is not automatically rated for a heavier task.
A figure labelled "SWL: 115 kg" should not automatically be read as "the user may weigh 115 kg". The ladder safe working load normally needs to accommodate the user and anything they are carrying or handling.
Checking your load against the rating
User weight + tools and materials carried ≤ Stated working load limit
A 90 kg user carrying a 15 kg tool or component already needs a working load limit of at least 105 kg, before allowing for a tool belt or protective equipment.
Dreymar product information includes real SWL figures such as "SWL: 115 kg" on selected models. We should read that figure together with the model's instructions and configuration requirements, since a single aluminium ladder and a 5-in-1 aluminium ladder may have different permitted arrangements depending on how the product is set up. Never increase the working load limit because a task appears brief, short duration does not make an excessive load safe.
Action
Add up the heaviest likely user weight plus tools and materials, then compare that total to the manufacturer's stated working load limit.
Allow five minutes
Section 04
Matching the Rating to the Job
Choosing the correct ladder rating starts with the task, not the product photograph. We should calculate the expected total load, identify how often the ladder will be used, and consider the working height, configuration, and surface. Do not under-rate the ladder: if the user, tools, and materials approach or exceed the working load limit, the product is unsuitable, even for a job that takes only a few minutes. Equally, there is no need to overpay for a rating that has no relevance to the planned work.
For common A-frame applications, we can compare a heavy duty A-frame stepladder, a medium duty A-frame stepladder, or a light duty A-frame stepladder according to the work rather than choosing by price alone. Good ladder safety also depends on setup and behaviour: use the ladder only in its approved configuration, keep the feet on a firm level surface, and avoid overreaching. A ladder safe working load is a capacity limit, not a measure of how stable an incorrectly positioned ladder will be. Our wider range of ladders can be reviewed against the specific application.
Action
Match the ladder's configuration, working height and rating to the actual task before ordering, rather than choosing by price.
Allow five minutes
Section 05
The Practical Takeaway
Use Class 1 and EN131 markings as useful specification clues, but verify the actual working load limit and supporting documentation for the exact model. Match that evidence to the task, and choose a ladder with suitable capacity rather than operating at the edge of its rating.
Get these four right
- A ladder duty rating specifies the level of work and loading the ladder is designed to support, helping match equipment to job requirements safely.
- Safe working load (SWL) includes the combined weight of the user, clothing, tools, and materials, not just the operator's body weight.
- Class 1 ladders indicate suitability for professional or industrial use but must be checked alongside manufacturers' instructions and load limits for safety.
- EN131 is a European standard covering ladder design and testing, but compliance does not automatically equate to meeting a specific duty rating.
Answers
Frequently Asked Questions
What does a ladder duty rating actually tell me?
It tells us the level of work and loading a ladder is designed to support, helping match equipment to the job, but it isn't a full safety guarantee on its own. It should always be checked alongside the ladder's stated safe working load, construction, and the manufacturer's instructions.
Is Class 1 the same as EN131?
No. Class 1 is a commonly referenced classification associated with more demanding professional use, mostly in UK-oriented terminology, while EN131 is a European standard covering ladder design, construction, and testing. A ladder can carry one label, both, or neither, and each answers a different question.
What's the difference between SWL and working load limit?
They're generally used interchangeably. Both describe the maximum total load the ladder is designed to support during permitted use, including the user, clothing, tools, and materials, not just body weight. Always check the figure against the manufacturer's specific definition for that model.
How do I know if a ladder's rating is enough for the job?
Add up the heaviest likely user weight plus tools and materials carried, then compare that total against the manufacturer's stated working load limit. If the combined figure is close to or exceeds the limit, choose a ladder with more capacity rather than risk it.
Not sure which ladder rating your job needs?
Tell us the task, the working height, and the combined weight you need to carry, and we will help you match it to a duty rating and working load limit that fits.