|  | 8.7 | Planning Structured Cabling: Cabling and Grounding
| 8.7.2 | Networking devices and dangerous circuits
As illustrated in the previous example, the closed circuit produced by your body and the UTP cable would allow electrons to flow from the negative source to the positive source through your body. If the ground wires for the devices in one location have a slightly different potential, to the common and hot wires, than the ground wires for the devices in the second location, the closed circuit produced by the use of UTP cable would allow electrical current to flow from the negative source to the positive source. Anyone touching the chassis of a device on the network would receive a nasty shock. A good way to avoid having current pass through the body, and through the heart, is to use the one hand rule. Simply put, this rule says that you should not use more than one hand at a time to touch any electrical device. The second hand should remain in your pocket.