Electrical power tools must always use as per manufactures specifications and instructions, Always use a good brand Power Tool ,ensure  voltage going to power tool is what it is rated for. Cordless power Tools Must use the correct size and rated batteries.

Electricians , electrical apprentices, electrical contractors and licensed electrical inspectors must ensure power tools are in correct working condition, never use damage or malfunctioning power tools;. report damage defective tools to your supervisor. Always use the correct safety gears PPE when using power tools  Always ensure electrical power tools are rated to international  standard. Power tools must be cleaned and properly stored when not in use..

Be reminded you can have serious injury or death if power tools are not used correctly. Safety must always be observed.