IEC 62841-3-7:2020

Overview

IEC 62841-3-7:2020 is an international safety standard published by the International Electrotechnical Commission (IEC). This document specifies the particular safety requirements for transportable wall saws. These are electric motor-operated tools equipped with track guiding systems, intended for dry cutting or for connection to a liquid system, allowing them to cut materials such as concrete, stone, and similar substances using a diamond wheel. The standard covers wall saws with diamond wheel peripheral speeds up to 100 m/s and specifies rated voltage limits of 250 V for single-phase tools and 480 V for three-phase tools.

Note: This standard does not apply to wall saws left unattended during operation, those using hydraulic systems, or hand-held cut-off machines.

Key Topics

1. Scope and Definitions

• Applies to transportable wall saws operated by electric motors and guided by a track system.
• Covers saws intended for manual, attended operation by a user, either directly or via a remote control.
• Defines key terms such as diamond wheel, flange, track guiding system, and wheel guard.

2. Safety Requirements

• Mandates protection against live parts and ensures adequate marking and safety instructions.
• Specifies the importance of wheel guards for operator protection from debris, accidental contact, and liquid or fragments during operation.
• Outlines requirements for safe operation near electrical wiring, including usage by insulated surfaces to prevent shock.
• Requires clear marking of directional rotation and mass labeling for components above 25 kg.

3. Protection Against Electrical Hazards

• Demands moisture resistance and specifies testing procedures involving remote controls and liquid system connections.
• Obligates use of Residual Current Devices (RCDs) with defined response thresholds to prevent electrical shock in case of liquid system faults.
• Sets leakage current limits for various operational and testing scenarios.

4. Endurance, Mechanical, and Operational Testing

• Stipulates endurance testing at voltages above and below ratings to ensure durability.
• Requires mechanical strength and reliability, especially for electrical components and connections.
• Details noise emission measurement and recommends the use of hearing protection.

5. User Instructions and Marking

• Requires user manuals to include information about compatible diamond wheels, safe handling, mounting of guides, and correct usage of remote controls.
• Mandates safety signage for eye and ear protection, and instructions about proper use and maintenance.

Applications

IEC 62841-3-7:2020 is crucial for:

• Manufacturers of wall saws: Ensures product safety, reliability, and global market access.
• Testing and certification bodies: Provides a benchmark for conformity assessment.
• Construction and demolition contractors: Assures that equipment used for cutting concrete or stone meets international safety standards, reducing accident risks.
• Procurement and safety managers: Helps in selecting compliant tools and implementing safe operating procedures on-site.

Complying with this standard supports workplace safety, operator protection, and effective equipment performance, particularly in demanding construction, renovation, or demolition environments.

Related Standards

For comprehensive compliance, the following related standards are relevant:

• IEC 62841-1:2014: General requirements for electric motor-operated hand-held tools, transportable tools, and lawn and garden machinery.
• IEC 61008-1: Residual current operated circuit-breakers (RCCBs) - General rules.
• ISO 6603-1: Plastics - Determination of puncture impact behaviour of rigid plastics.
• ISO 3744, ISO 11201: Methods for measuring noise emissions from machinery.
• Other parts of the IEC 62841 series covering different tool types and additional safety requirements.

Keywords: IEC 62841-3-7, transportable wall saw, diamond wheel, electric motor-operated tools, safety standard, compliance, construction equipment, electrical safety, Residual Current Device, operator protection, mechanical hazards, equipment marking.