When energizing (closing the fuse), follow this rule: close the outer phases first, then the center phase! In windy conditions, close the upwind outer phase first, followed by the downwind outer phase, and finally the center phase. This approach minimizes the electric arc and uses the wind to carry it away, preventing inter-phase short circuits and ensuring maximum safety.

When de-energizing (opening the fuse), the sequence is reversed: open the center phase first, then the downwind phase, and finally the upwind phase. Never get this order wrong - otherwise, the wind could blow the electric arc onto other phases, potentially causing a trip or even resulting in personal injury!

Before operation, ensure you have all necessary protective equipment: insulating boots, insulating gloves, safety goggles, and a certified insulating pole. Verify that the insulation resistance (measured with a 2500V megohmmeter) is at least 300 MΩ. Inspect the fuse tube for cracks (ensuring none exceed 50 mm) and confirm that the fuse element's current rating is within a ±10% tolerance. Maintain a safety distance of at least 0.7 meters from the equipment, and ensure a dedicated supervisor is present.

Operating under load is strictly prohibited, as is working during thunderstorms or high winds. When closing, advance the fuse at a steady, uniform speed, applying a final force of 50–80 N. When opening, pull downward at an angle of 30°–45° and a speed of 0.5–1 m/s, ensuring the fuse tube separates by at least 200 mm.

Remember this classic mnemonic: "When de-energizing, open the center phase first, then the outer two; when energizing, close the outer phases first, then the center." Avoid common mistakes - such as closing the center phase or the downwind phase first - and always follow standard operating procedures to stay safe!