P6002ACMC datasheet(117/212 Pages) TECCOR

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Primary Protection

3 - 29

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SIDACtor® Data Book and Design Guide

+1 972-580-7777

Primary Protection

Primary telecommunications protectors must be deployed at points where exposed twisted

pairs enter an office building or residence. This requirement is mandated in North America

by the National Electric Code (NEC) to protect end users from the hazards associated with

lightning and power cross conditions.

Primary protection is provided by the local exchange carrier and can be segregated into

three distinct categories:

• Station protection — typically associated with a single twisted pair

• Building entrance protection — typically associated with multiple (25 or more) twisted

pair

• Central office protection — typically associated with numerous twisted pair feeding into a

switch

Station protectors provide primary protection for a single-dwelling residence or office. The

station protector is located at the Network Interface Unit (NIU), which acts as the point of

demarcation, separating the operating company’s lines from the customer’s.

Building entrance protection is accomplished by installing a multi-line distribution panel with

integrated overvoltage protection. These panels are normally located where multiple twisted

pairs enter a building.

A five-pin protection module plugged into a Main Distribution Frame (MDF) provides Central

and Remote Office protection. Like station and building entrance protection, the MDF is

located where exposed cables enter the switching office.

Teccor also offers a full line of five-pin protectors. For further details, contact factory at

protectionsystems@teccor.com or +1 972-580-7777.

Protection Requirements

Station protectors must be able to withstand 300 A 10x1000 surge events. The building

entrance protectors and CO protectors must be able to withstand 100 A 10x1000 surge

events. Figure 3.36 shows building entrance protector and CO protector asymmetrical

solutions. Figure 3.37 shows building entrance protector and CO protector balanced

solutions.

The following regulatory requirements apply:

• UL 497

• GR 974-CORE

• ITU K.28

Primary Protection Reference Circuit

Figure 3.36 and Figure 3.37 show different configurations used in primary protection. Note

that the peak off-state voltage (VDRM) of any device intended for use in primary protection

applications should be greater than the potential of a Type B ringer superimposed on a

POTS (plain old telephone service) battery.

150 VRMS

Ö2 + 56.6 VPK = 268.8 VPK

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