Do Collaborative Robots Need Safety Fencing?

One of the biggest selling points of a collaborative robot is working without a safety cage — sharing space with people. But "collaborative" doesn't automatically mean "no guarding required." The honest answer: it depends on your risk assessment. Here's what that means in practice.

How cobot safety actually works

Collaborative robots are typically power-and-force-limiting (PFL): built-in sensors detect unexpected contact and stop the arm before it can cause harm. That's what lets a cobot operate alongside operators where a traditional industrial robot would need a fence.

This capability is guided by ISO/TS 15066, the technical specification for collaborative robot operation, which works alongside the ISO 10218 robot safety standards.

So when do you still need guarding?

The robot being "collaborative" is only part of the picture. Safety depends on the whole application — the arm, the end-effector, the payload, and the task. You may still need guarding or additional safeguards when:

• The end-effector is hazardous — a sharp blade, a welding tip, or a tool that could injure regardless of arm force.
• The part is sharp, hot, or heavy — the payload itself poses a risk even at safe arm speeds.
• Speeds or forces exceed collaborative limits — running the arm fast for throughput can push it out of the collaborative envelope.
• Pinch points exist — between the arm and fixtures or walls.

In these cases, solutions range from safety-rated area scanners and light curtains that slow or stop the arm when someone approaches, to partial guarding — not necessarily a full cage.

The bottom line

Every cobot deployment needs its own risk assessment (per ISO 12100 / ISO 10218 / ISO/TS 15066). A properly assessed, power-and-force-limited application with a safe tool and light payload can often run fence-free. Add a hazardous tool, sharp parts, or high speeds, and you'll likely need added safeguards. Don't assume "collaborative" equals "no guarding" — assess the full application.

Get it right from the start

Robo Mechanix is an authorized Dobot dealer and automation specialist. We help you spec a collaborative cell that fits your task — and flag where a risk assessment may call for added safeguards — before you buy. Explore Dobot collaborative robots or request a quote with your application details.

This article is general guidance, not a substitute for a formal risk assessment by a qualified safety professional.

FAQ

Are collaborative robots safe around people?
Within a properly risk-assessed collaborative cell, yes — PFL cobots detect contact and stop. But the end-effector, payload, and speed all affect safety, so each deployment needs its own assessment.

Does every cobot application avoid fencing?
No. If the tool is hazardous, parts are sharp/hot/heavy, or the arm runs at high speed, you may still need guarding or safety sensors.