When performing maintenance on radar or fire-control electronics, which practice reduces electrical hazard?

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The safety goal here is to eliminate or greatly reduce the chances of shock and arcing during maintenance. Isolating the power by de-energizing the equipment and applying a proper lockout prevents any accidental re-energization while you work, which is the most reliable way to remove the electrical hazard. Using non-sparking tools adds a second layer of protection by minimizing the energy of any spark that might occur if there’s any residual energy or metal contact, reducing the risk of ignition or arc-related injuries. Insulated tools help against shock if a circuit is live, but the emphasis during maintenance should be on ensuring the circuit is truly de-energized and on reducing spark hazards, which makes the non-sparking tools plus lockout approach the best practice.