On all types and ratings of receptacles, the grounding blade is ____ than the others to ensure that it makes its connection before the grounded conductors do and breaks its connection after they do (first make-last break).

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The grounding blade is longer than the other blades on a receptacle to ensure that it makes its connection before the other blades and breaks its connection after them. This is known as first make-last break and is designed to prevent electrical shock hazards. The other options (larger, more durable, tarnish-resistant) may also be features of grounding blades, but they are not the main reason why the grounding blade is longer.

On All Types and Ratings of Receptacles, the Grounding Blade