An electrical current needs to travel from point to point to complete a circuit. If you grab the end of a hot wire with one hand and touch a water pipe with the other, you provide the current with a path as it travels through you. The same is true if you’re standing on wet ground; the current will travel toward your feet. For this reason, whenever you change a fuse or flip a circuit breaker, you should use only one hand. The other hand should be behind your back or in your pocket. In other words, your other hand should be away from the service panel or fuse box. You don’t want it to accidentally come into contact with any metal surfaces in the box because that completes a pathway for the current.
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