ISO 20474-10:2017

Overview

ISO 20474-10:2017 - "Earth-moving machinery - Safety - Part 10: Requirements for trenchers" specifies safety requirements specific to trenchers (as defined in ISO 6165) and is intended to be used together with ISO 20474‑1 (general safety requirements for earth‑moving machinery). This type‑C standard covers significant hazards, hazardous situations and events during commissioning, operation and maintenance of trenchers when used as intended or in reasonably foreseeable misuse. The specific requirements of ISO 20474-10 take precedence over the general requirements in ISO 20474‑1. It is not applicable to machines manufactured before its publication date.

Key topics and technical requirements

• Scope & precedence
  • Applies only to trenchers and supplements ISO 20474‑1; specific trenchers’ requirements override general clauses where they differ.
• Restraint bar
  • A restraint bar must be fitted and extend as far as practical over the length of the digging chain to reduce contact with digging elements.
• Ride‑on trenchers
  • Operator’s seat and station requirements, including exceptions (e.g., transverse seats may not require fore/aft adjustment).
  • Additional or separate operator stations for attachments can have specific exemptions (cab, ROPS, FOPS).
• Operator controls
  • Engine stop provisions: additional engine stop if a special-attachment seat cannot reach the normal stop per ISO 6682.
  • Control deactivation: travel and attachment movement must stop when the operator leaves the station.
• Non‑riding (pedestrian) trenchers
  • Must include systems that stop travel and hazardous tool movement when operator releases controls.
  • Controls must be designed to prevent inadvertent movement toward the operator.
  • Lighting and warning-device provisions: ISO 12509 applies if lighting is fitted; some warning-device rules for pedestrian-controlled machines are modified.
• Noise
  • Sound power and operator sound pressure measurements per ISO 6393 and ISO 6394.
  • Instruction to wear hearing protection when A‑weighted sound pressure exceeds 85 dB.
• Information for use
  • User instructions must include hearing protection advice, deactivating device instructions, restraint bar safety rules, and guidance for pedestrian-controlled trenchers.

Applications - who uses ISO 20474-10:2017

• Trenchers’ manufacturers for design, safety compliance and CE marking guidance
• Safety and compliance engineers preparing risk assessments and technical files
• Procurement teams specifying safe equipment for construction, utilities and pipeline work
• Test laboratories measuring sound and validating control/deactivation systems
• Operators and maintenance personnel relying on information-for-use and safety instructions

Related standards

• ISO 20474‑1 (General safety requirements for earth‑moving machinery)
• ISO 6165 (Trencher definition / basic types)
• ISO 12509 (Lighting, signalling, marking)
• ISO 6393 / ISO 6394 (Noise measurement)
• ISO 13539 (Trencher definitions / commercial specs)
• ISO 6682 (Control reach/zones)

Keywords: ISO 20474-10:2017, trenchers safety, earth-moving machinery, restraint bar, operator controls, pedestrian trenchers, noise measurement, ISO 20474-1.