BS EN 17206:2020 — Stage Machinery Safety Guide

BS EN 17206:2020 defines safety requirements and inspection principles for machinery used in stages and production environments within the entertainment industry.

The standard replaced BS 7905-1 and BS 7906-1 and provides a unified framework for the design, control, inspection, and safe operation of stage machinery across theatres, studios, touring productions, and live-event venues.

This page provides a practical overview intended for engineers, production managers, technical managers, and automation specialists working with stage machinery.

Scope of BS EN 17206

The standard applies to machinery including:

• Fly-bar systems and point hoists
• Performer flying systems
• Lighting bars and technical bars
• Orchestra and stage elevators
• Stage wagons and tracking scenery
• Revolving stages and turntables
• Trap lifts and compensating elevators
• Tilting stage floors
• Scenery storage elevators

BS EN 17206 addresses hazards arising from moving loads, scenery, equipment, and performers within production environments.

Use-Case Classifications (UC1–UC6)

BS EN 17206 introduces six Use-Case classifications to define the required safety-function integrity based on risk.

The applicable Use Case may differ between setup, rehearsal, and performance operation and must be determined through risk assessment.

Performance Level (PL) and Safety Integrity Level (SIL)

BS EN 17206 references functional safety concepts drawn from standards such as EN ISO 13849-1 and IEC 61508/62061. These define the reliability required of safety-related control functions.

Performance Level (PL)

Performance Level describes the probability of failure of safety-related control systems and is typically expressed from PLa to PLe, where PLe represents the highest integrity.

PL is commonly used for machine-control safety systems implemented using safety PLCs, relays, sensors, and drives.

Safety Integrity Level (SIL)

Safety Integrity Level describes risk-reduction capability in programmable or electronic safety systems and is defined from SIL1 to SIL3.

Stage automation safety functions often align with SIL2 or SIL3 depending on risk and Use Case classification.

In practice, stage-automation systems typically implement safety functions such as emergency stop, speed monitoring, position monitoring, overload detection, and synchronisation monitoring using certified safety components.

Risk Assessment Workflow

BS EN 17206 safety design begins with a structured risk assessment.
The process typically follows the sequence below.

This workflow ensures that safety functions are derived from actual risk, rather than selected arbitrarily.

Typical Stage-Automation Safety Architecture

Modern stage-automation systems separate motion control from safety control, with certified safety hardware supervising motion behaviour.

Sensors such as encoders, load cells, limit switches, and safety relays provide feedback to the safety controller, allowing continuous monitoring of motion behaviour.

Validation and Verification

BS EN 17206 requires safety functions to be verified and validated.
These processes confirm that the control system behaves as intended and that safety measures achieve the required risk reduction.

Verification

Verification confirms that the system design meets the specified technical requirements, including wiring, safety logic, and component selection.

Validation

Validation confirms that the installed machinery behaves safely in real operation, including fault conditions and emergency stops.

• Safety-function testing
• Emergency-stop testing
• Monitoring-function testing
• Fault-simulation testing
• Documentation review

Inspection and Maintenance Requirements

BS EN 17206 defines inspection principles for stage machinery throughout its life cycle.

Inspection stages typically include

• Initial inspection before first use
• Periodic inspection
• Inspection after modification
• Inspection following exceptional events

Inspection intervals are determined by risk assessment, usage patterns, local regulations, and equipment type.

In the UK, inspection regimes often interact with:

• LOLER (Lifting Operations and Lifting Equipment Regulations)
• PUWER (Provision and Use of Work Equipment Regulations)
• Venue engineering policies

Documentation typically includes inspection reports, maintenance records, control-system schematics, safety-function validation, and operating manuals.

Safety Functions in Stage Machinery

BS EN 17206 identifies safety functions that may be required depending on Use Case classification and risk assessment.

• Emergency stop systems
• Dead-man control
• Speed monitoring
• Position monitoring
• Overload and underload detection
• Slack-rope detection
• Brake monitoring
• Travel-limit protection
• Loss-of-synchronisation detection

These safety functions must be implemented with appropriate reliability and validated as part of the machinery safety design process.

Common Safety Mistakes in Stage Automation

• Assigning the wrong Use Case classification
• Relying on software without independent safety monitoring
• Ignoring synchronisation monitoring for grouped hoists
• Insufficient inspection planning
• Missing documentation in the technical file
• Incorrect safety-component selection

Many incidents in stage machinery arise from misunderstanding risk rather than equipment failure.

References

• BS EN 17206:2020 — Machinery for stages and production areas
• EN ISO 13849-1 — Safety-related parts of control systems
• IEC 61508 / IEC 62061 — Functional safety standards
• LOLER — Lifting Operations and Lifting Equipment Regulations
• PUWER — Provision and Use of Work Equipment Regulations
• AVW Stage Automation Safety Guide