UL SUBJECT 497E-2008《天线引入线导线用防护罩调查大纲.发布编号:2》

1.1 This Outline of Investigation covers protectors for antenna lead-in conductors. These devices are
used to limit surges on the cable that connects the antenna to the receiver/transmitter electronics and are
connected between the conductors and the grounded shield or other ground connection. Typical
applications include antenna installations for radio and television receiving equipment, amateur radio
transmitting and receiving equipment, cellular telephone towers and WiMax or WiFi wireless networks.
1.2 As covered by these requirements, protectors for antenna lead-in conductors typically consists of air
gap arresters, gas tube arresters, solid-state arresters or quarter-wave stub type devices, or combinations
of these devices. Other technologies are not excluded. They may or may not contain additional
components such as inductors or blocking capacitors. These protectors are intended to protect
equipment, wiring, and personnel at the premises against the effects of excessive potential