IEEE C62.43.1-2020 pdf download

IEEE C62.43.1-2020 pdf download.IEEE Guide for Surge Protectors and Surge Protective Circuits Used in Information and Communication Technology Circuits (ICT), Including Smart Grid- Part 1 Aplications.
5.2.1.1 Primary protectors
Primary surge protectors are intended to be installed at the end of paired-conductor ICT circuits, central offices, and customer premises. Primary protectors are typically in one of the configurations shown in Figure 6 through Figure 10 and are intended for use on internal building communication circuits that enter from an exposed outside plant. The primary protector is typically listed (e.g., UL 497 [852]); also see GR-974-CORE [B47j, GR-1361-CORE [B49j, and ITU-T recommendation K.12 [B35]. In cases where a primary protector is used outdoors, the circuitry and related hardware are housed within an environmentally suitable enclosure.
5.2.1.2 Secondary protectors
The secondary protector is intended for use in coordination with a primary protector, and is typically located within, or just before, the protected equipment. The secondary protector is required to be located on the equipment side of a primary communication protector. In those applications that do not require a primary protector (e.g., intrabuilding cabling), a secondary protector can be used by itself, located within, or just before, the protected equipment.
Secondary protectors are typically in one of the configurations shown in Figure 8, Figure 9, and Figure 10, and are intended for use on internal building communication circuits that enter from an exposed outside plant. The secondary protector is typically listed (UL 497A [B53j).
The secondary protector is not provided by the ICT service provider, and is typically an equipment manufacturer, installer, or equipment-owner concerned with fast-rising transients that are not limited by the primary protector. The secondary protector is designed to suppress these types of transients, which are caused by coupling from lightning or other electrical disturbances. The secondary protector also helps protect against above-normal currents that might otherwise be conducted to ground within the protected equipment. Without primary-secondary protector coordination, a low-impedance path to ground in the secondary protector can result in the bypassing of the primary communications protector, with potential damage to the secondary protector due to excessive current flow.
5.2.1.3 Primary and secondary grounds
There can be a considerable difference between the local grounding system voltage value at the primary protector and local grounding system voltage value at the secondary protector and the equipment. This voltage difference is mitigated by having the equipment and secondary protector connected to the same local grounding system point.
5.2.2 ICT two-terminal protector module
Two-terminal protector modules are commonly used in a telephone company central office to protect and
connect the outside cable pair to the ICT equipment inside the central office.
Two possible configurations of a two-terminal protector are illustrated in Figure 6. They are intended to protect personnel and ICT equipment from electrical surges that can occur on ICT circuits. These surges can originate from lightning or from faults on nearby ac power lines. The purpose of the protector is to limit surge voltages or currents and return to its quiescent state when the surge has dissipated.
Two-terminal protector modules are also used in outdoor applications, such as remote terminals, building entrance terminals, and network interface devices. These applications can present an uncontrolled environment, exposing the modules to a wide range of temperature and humidity conditions. The two-terminal module selection process should anticipate that.
5.2.3 ICT three-terminal protector module
Three-terminal protector modules are commonly used in a telephone company central office to protect and
connect the outside cable pair to the ICT equipment inside the central office.
Three possible configurations of a three-terminal protector are illustrated in each of Figure 7 and Figure 8. Note that in some cases the three-terminal protectors shown in Figure 8 might not have the indicated overcurrent protector. These protectors are intended to protect personnel and ICT equipment from electrical surges that can occur on paired-conductor ICT circuits. These surges can originate from lightning or from faults on nearby ac power lines. The purpose of the protector is to limit surge voltages and currents, or both, and return to its quiescent state when the surge has dissipated.