|  | 8.7 | Planning Structured Cabling: Cabling and Grounding
| 8.7.6 | Reasons for using UTP for backbone cabling between buildings

While faulty wiring can present one type of electrical problem for a LAN that has UTP cable installed in a multi-building environment, there is another type of problem that can occur. Whenever copper is used for backbone cabling, it can provide a pathway for lighting strikes to enter a building. Such strikes are a common cause of damage to multi-building LANs. It is for this reason that new installations of this type are moving toward the use of fiber-optic cable for the backbone cabling.