🔍 Key Concepts

• Double-insulated tools vs. grounded tools—what extra protection does each design rely on? • Purpose of the ground (third prong) on a plug and when it is required for safety. • Risk of electric shock when metal cases or ungrounded equipment become energized.

💭 Think About

• Ask yourself: If a tool is NOT double-insulated and has a metal case, what protects the user if a hot wire touches the case? • Consider: Does a double-insulated tool normally need a grounding conductor, or is its design intended to avoid that need? • Think about whether using an adapter to defeat the ground prong makes the situation safer or more dangerous—and why.

✅ Before You Answer

• Verify which type of tool design (double-insulated vs. not) is intended to be used without a grounding conductor. • Check which statements would increase shock risk instead of reducing it—those are not likely to be correct safety guidance. • Eliminate any option that suggests it is acceptable to defeat or bypass the ground connection on a grounded tool.