Hazards and controls of portable tools (powered)

Power tools are mechanical or electrical devices powered by a motor or battery. They are typically faster and more powerful than hand tools, which makes them ideal for larger jobs. They can also be harder to control than hand tools, and can be more expensive. Common examples:

• circular saws: for cutting wood, metal or other materials quickly
• power drills: for making holes in wood, metal or other materials
• angle grinders: for grinding, polishing and deburring
• electric sanders: for smoothing and finishing

Basic precautions before using powered hand tools:

• Make sure you have been trained to use the tool safely. Read the operator's manual before using the tool, and operate it according to the manufacturer's instructions. Use only tested and approved tools.
• Make sure the power tool has the correct guard, shield or other attachment the manufacturer recommends.
• Use only the kind of battery the manufacturer specifies for a battery-powered tool.
• Recharge a battery-powered tool only with a charger intended for the battery in that tool.
• Before changing accessories or making adjustments, disconnect the relevant power source or remove the battery as specified by the manufacturer, prevent restart and wait for movement to stop. A normal off switch alone may be insufficient.

Basic precautions while using powered hand tools:

• Wear or use PPE or clothing suited to the work. This may include safety glasses or goggles, or a face shield with safety glasses or goggles, hearing protection, a dust mask, gloves, safety boots or shoes, or rubber boots.
• Switch tools off before connecting them to a power supply.
• If a power cord feels more than comfortably warm, or a tool is sparking, have it checked by an electrician or another qualified person.
• Disconnect the power supply before making adjustments or changing accessories.
• Remove any wrenches and adjusting tools before turning a tool on.
• Inspect the cord for fraying or damage before each use. Tag defective tools clearly with an "out of service" tag and replace them at once with a tool in good running order.
• During use, keep power cords clear of the tool and of the path the tool will take.
• Use clamps, a vice or other devices to hold and support the piece being worked on, where practical. This lets you use both hands for better control of the tool and helps prevent injury if the tool jams or binds in the work piece.
• Pull the plug, not the cord, when unplugging a tool. Pulling the cord wears it and may damage the wiring to the plug and cause electric shock to the operator.
• Follow good housekeeping. Keep the work area free of clutter and debris that could be a slip or trip hazard.
• Keep power cords away from heat, water, oil, sharp edges and moving parts, which can damage the insulation and cause a shock.
• Keep cutting tools, drill bits and so on sharp, clean and well maintained.
• Store tools in a dry, secure place when not in use.
• Do not bypass the on and off switch and operate tools by connecting and disconnecting the power cord.
• Do not leave a running tool unattended. Do not leave it until it has been switched off, has stopped running completely and has been unplugged.
• Use electrical tools only where the equipment and protective arrangements suit the environment. An RCD can provide additional protection for some faults, but does not make an unsuitable tool safe in wet conditions or prevent every shock.
• Do not carry electric tools by the power cord.
• Do not operate tools in an area containing explosive vapours or gases.

Summary notes for Element 9 · Cheat sheet · Glossary. A study aid, not published or endorsed by NEBOSH.