Not all height-related terms are created equal. Two commonly used but often misunderstood terms are platform height and working height. Understanding the difference is more than just a technicality. It affects equipment selection, task planning and, most importantly, safety.
Many accidents and inefficiencies stem from workers needing to understand these two concepts or account for them during job preparation. This blog dives deep into platform height and working height, breaking down their meanings, differences and real-world applications.
What is Platform Height?
Platform height is simple, measurable and precise. It’s the vertical distance from the ground to the equipment platform.
This measurement doesn’t change based on the user or the task—it’s fixed. If the equipment has a platform at 10 feet, the platform height is always 10 feet. Think of it as the height where your feet will rest when you’re standing on the platform.
How is Platform Height Measured?
Platform height is measured from the ground to the surface of the platform without considering additional factors like user reach or tools. For example:
If a scissor lift elevates its platform 15 feet off the ground, its platform height is 15 feet.
A ladder with its top step 8 feet high has a platform height of 8 feet.
Platform height is critical for calculating the overall reach of the worker using the equipment.
Examples of Equipment with Platform Height Specifications
Almost every type of access equipment includes platform height in its specifications. Some examples are:
- Scissor Lifts: Used for stable, vertical elevation with platform heights ranging from 10 feet to 50 feet.
- Boom Lifts: These allow for both vertical and horizontal reach, with platform heights often exceeding 100 feet for specialised tasks.
- Step Ladders: Ideal for low-level work with platform heights generally under 10 feet.
- Work Platforms and Podiums: Offer a stable platform for tasks requiring more precision at heights.
What is Working Height?
Working height is a more flexible and subjective concept. It refers to the maximum height a worker can reach while standing on a platform. Manufacturers typically calculate it by adding the platform height to the average vertical reach of a person.
How is Working Height Calculated?
Here’s the formula:
Working Height = Platform Height + Average Vertical Reach
Most manufacturers assume an average vertical reach of 6 feet (based on the average adult’s arm length and torso height). So, for a platform height of 10 feet, the assumed working height is 16 feet.
Why Does Working Height Vary?
Working height isn’t a fixed number because people vary in height and reach. A tall worker may have a working height greater than the assumed average, while a shorter worker may have a lower working height.
For example:
- A worker who is 5’10” with an arm span of 6’2” will have a higher working height than a worker who is 5’2” with a shorter reach.
- Tools being used, such as long-handled wrenches or drills, can also extend the effective working height.
The Importance of Education and Awareness
Working height is less predictable than platform height, which is why training and awareness are crucial.
Workers must be aware of how limited their reach is. They need to avoid unsafe practices like overextending or standing on guardrails to gain additional height. A work at height training course can help workers understand their working height and how it applies to specific tasks.
Choosing Equipment Based on Height Needs
Selecting the correct equipment isn’t just about the numbers. Safety, efficiency and task-specific requirements all play a role. Here’s how to make an informed decision:
Steps for Selecting Equipment
- Assess the Task: Determine the maximum height required for the job. Consider the height of the task itself, like installing a light fixture or cleaning windows and the working height needed to complete it.
- Understand the Measurements: Look at both platform height and working height. Ensure the equipment’s specifications meet or exceed the task’s height requirements.
- Avoid Overextending: Never work at the edge of your reach. Using equipment with inadequate height forces workers to stretch beyond safe limits, increasing the risk of falls.
- Train Your Team: Clear concepts reduce mishaps. Programmes such as workplace ladder safety training teach workers to choose the right equipment and follow safe practices, like maintaining three points of contact.
Equipment Safety Considerations
When choosing equipment, always prioritise safety:
- Inspect Equipment: Check for damage or defects before use.
- Use Fall Protection: Harnesses, guardrails and other fall prevention tools should always be in place.
- Know Weight Limits: Exceeding a platform’s weight capacity can lead to tipping or structural failure.
- Check Stability: Ensure the equipment is on a level surface before use.
Example Scenarios
1. Changing a Lightbulb at 12 Feet
Most users may be satisfied with a ladder with a platform height of 6 feet and a working height of 12 feet.
2. Painting a Ceiling of 20 Feet
With a platform height of 14 feet, a scissor lift will provide a working height of 20 feet, which would likely be sufficient.
3. Trimming Trees at 30 Feet
A boom lift with an adjustable arm and a platform height of 24 feet might be ideal for this task.
The Takeaway
Distinguishing platform height and working height may seem subtle, but it’s a critical distinction. Together, these measurements guide workers in selecting the right tools for the job.
Ignoring these differences can lead to safety risks, inefficiencies and costly mistakes. Workers should always check equipment specifications, factor in their reach and ensure proper training to stay safe and productive.
By understanding the nuances of platform and working height, workers can confidently tackle any height-related task with the right equipment and a focus on safety.
