UL 497C:2001 pdf download.Protectors for Coaxial Communications Circuits.
3.9 OUTSIDE PLANT (OSP) -That part of the communications circuit extending from the subscriberpremise protector to the main distribution frame of the public utility company providing the service.
3.10 PROTECTOR- A device comprised of an overvoltage, overcurrent component, or both and isintended to prevent damage to a circuit or system when abnormally high voltage and/or current occur.
3.11 TRUE RMS - Unit of electrical measurement by a meter capable of sampling, over time, the
varying magnitude of a complex waveform to produce a computed root-mean-square value equivalent tothe same direct current value which produces the same heating effect.
CONSTRUGTION
4 General
4.1 A coaxial cable circuit protector shall be constructed to withstand，without damage，its intendedinstallation and use and shall comply with the applicable performance requirements specified in Sections10- 33.
4.2 A fuseless coaxial protector shall consist of an assembly comprising:
a) An insulating base or grounded metallic base supporting an overvoltage arrester;b) Provision for connecting the center conductors of a coaxial cable circuit; andc) Provision for connecting at least one grounding conductor.
An arrester shall be connected between the coaxial center conductor and ground.The connection orconnections for the grounding conductor shall be conductively connected to a ground electrode orterminall.
4.3 A fused coaxial protector shall consist of an assembly comprising:
a) An insulating base supporting an arrester;
b) Provision for mounting a center conductor fuse;
c) Provision for connecting the center conductors of a coaxial cable circuit; andd) Provision for connecting at least one grounding conductor.
