What safety measure is recommended when working with live electrical circuits?

When working with live electrical circuits, it is highly recommended to keep one hand behind your back. This practice is aimed at reducing the likelihood of an electrical shock. By keeping one hand behind your back, you minimize the risk of creating a path for electricity to flow through your body, which can happen if both hands are in contact with a live circuit. This safety technique is especially important because if a person were to touch a live circuit with both hands, it could allow electrical current to flow across the chest, which is more dangerous and can lead to severe injury or death.

The other practices mentioned do not provide the same level of protection. Using both hands or keeping a hand in your pocket does not effectively prevent electrical shock. Wearing goggles may protect your eyes from potential debris or splashes but does not address the critical concern of avoiding electrical shock. Therefore, the approach of keeping one hand behind your back is a well-established safety measure in the field of electrical work.