When do I need a twist-lock extension cord instead of a standard one?

For 99% of home use, a standard extension cord works fine. Twist-lock cords are only needed for heavy-duty or vibrating setups like job sites, outdoor events, generators, circular saws, stage speakers, RVs, boats, or data centers where accidental disconnection is unacceptable. For the garage, Christmas lights, or a lawn mower, standard is fine.