When using power tools, acceptable practices include wearing proper eye and hearing protection, keeping guards in place, using the right extension cord for the job, and avoiding loose clothing or jewelry that could get caught in moving parts. These aren’t just good habits. Most are legal requirements enforced by workplace safety regulations, and they apply equally whether you’re on a job site or in your garage.
Acceptable Clothing and Personal Items
Loose clothing, neckties, dangling jewelry, and unsecured long hair are all unacceptable around power tools with rotating or moving parts. A drill press, bench grinder, or circular saw can catch fabric or a necklace in a fraction of a second, pulling you into the tool before you can react. Wear close-fitting clothes, remove rings and bracelets, and tie back hair that falls past the shoulders. Closed-toe shoes with slip-resistant soles are standard; sandals or open-toed footwear are never acceptable.
Gloves are a gray area. They’re helpful when handling rough materials, but they should generally be removed when operating tools with spinning bits or blades, since the glove material can wrap around a shaft. Check the manufacturer’s manual for specific guidance on your tool.
Required Eye and Face Protection
Safety glasses or goggles are required for any power tool operation that could produce flying debris: sawing, grinding, drilling, nailing, or cutting. Acceptable eye protection must meet the ANSI Z87.1 standard, which you can confirm by looking for a “Z87” marking on the lens or frame. Regular prescription glasses do not meet this standard, even if they feel sturdy. If you wear prescription lenses, use Z87-rated over-glasses or prescription safety glasses.
For grinding or cutting tasks that throw larger particles, a full face shield over safety glasses provides additional coverage. A face shield alone, without glasses underneath, is not considered adequate protection for high-velocity debris.
Keeping Tool Guards in Place
Every power tool ships with guards for a reason, and removing or tying back a guard is one of the most common and dangerous shortcuts people take. Regulations are specific: portable circular saws with blades larger than 2 inches must have guards both above and below the base plate. The lower guard must automatically snap back to cover the blade the instant you pull the saw away from the material. If that spring-return mechanism is sluggish or broken, the saw is not acceptable to use until it’s repaired.
Angle grinders and vertical portable grinders must have a guard that keeps no more than 180 degrees of the wheel exposed, positioned between you and the disc. This way, if the wheel shatters, fragments deflect away from your body. The only situation where guard coverage can be reduced is when the workpiece itself covers the exposed side of the wheel, providing equivalent protection.
Switches and Trigger Controls
Not all power tools are allowed to have a lock-on button. Circular saws with blades over 2 inches, chainsaws (electric, hydraulic, pneumatic, or gas-powered), and percussion tools without a secure accessory-holding mechanism must use a constant-pressure switch, sometimes called a “dead man’s switch.” This means the tool shuts off the moment you release the trigger. If a lock-on button has been added to one of these tools, or the constant-pressure switch has been bypassed, the tool is not acceptable to operate.
For other tools like drills, routers, and sanders, a lock-on switch is generally acceptable but should be used carefully. Make sure you know where the off switch is before starting any cut or operation.
Extension Cords and Electrical Safety
Using the wrong extension cord is one of the most common mistakes with corded power tools. A cord that’s too light for the tool’s amperage draw will overheat, potentially melting insulation or starting a fire. The acceptable wire gauge depends on both the tool’s amp rating and the cord’s length.
- 25-foot cord: 14-gauge wire handles up to 20 amps
- 50-foot cord: 14-gauge handles up to 12 amps; step up to 12-gauge for 15 to 20 amps
- 100-foot cord: 12-gauge handles up to 15 amps; you need 10-gauge for a 20-amp tool
The longer the cord, the more voltage drops along its length. Voltage drop above about 5% can cause a motor to overheat or underperform, so using the thickest gauge you can is always the safer choice.
Ground-fault circuit interrupter (GFCI) protection is required for any temporary outlet not part of a building’s permanent wiring, which covers most construction and outdoor work. A GFCI cuts power within milliseconds if current leaks to ground, such as through your body. Plug into a GFCI-protected outlet or use a portable GFCI adapter whenever you’re working outdoors, in damp areas, or on temporary wiring. Double-insulated tools, marked with a small square-inside-a-square symbol, don’t require a grounded (three-prong) outlet because their extra insulation layer provides equivalent shock protection.
Dust and Respiratory Protection
Power tools that cut, grind, or sand masonry, concrete, or stone release respirable crystalline silica, a fine dust that causes permanent lung damage with repeated exposure. The acceptable approach depends on the task. Stationary masonry saws operated with water suppression per the manufacturer’s instructions typically don’t require a respirator at all, since the water keeps dust levels low enough.
Handheld power saws cutting masonry outdoors require at minimum an N95-equivalent respirator (rated APF 10) when dust controls aren’t fully effective. Indoors, that same N95 is the baseline even with dust controls in place. Tuckpointing with a handheld grinder demands more protection: at least APF 10 with controls, and APF 25 without them, which typically means a half-face respirator with P100 filters.
For wood dust, an N95 mask is generally sufficient for occasional cutting. Treated lumber and engineered products can release chemical irritants in addition to fine particles, so working in a ventilated area or using dust collection attachments is the acceptable practice.
Workspace Setup and Lighting
Operating power tools in a cluttered, dimly lit space is not acceptable. Your work area should be clean, dry, and well-lit. Workplace lighting standards call for a minimum of 10 foot-candles in workshops, machine shops, and outdoor work areas. For reference, 10 foot-candles is roughly the brightness of a well-lit hallway. If you’re doing detailed work or using a table saw, brighter is better.
Keep the floor clear of scrap material, cords, and sawdust that could cause slips. Secure your workpiece with clamps or a vise rather than holding it by hand. A piece that shifts mid-cut can bind the blade, causing the tool to kick back violently.
Battery and Cordless Tool Safety
Cordless tools eliminate extension cord hazards but introduce battery risks. Lithium-ion batteries should be stored in dry, cool locations away from direct sunlight and heat sources. Charging a battery that’s physically damaged, swollen, or giving off an unusual smell is not acceptable; these are signs of internal cell failure that can lead to thermal runaway and fire.
Use only the charger that came with your tool system or one explicitly approved by the manufacturer. Mixing chargers across brands can deliver incorrect voltage or charging rates, damaging cells and creating fire risk. When transporting batteries, keep terminals covered or protected to prevent short circuits from contact with metal objects like keys or screws.