Circuit protection installation

Last Updated : Jun 11, 2020 |
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All out-of-building trunks, lines, and terminal installations require protection from sneak currents and over-voltages, such as lightning and power line induction. Campus installations (interbuilding cabling) of phones or other standard devices require over-voltage and sneak current protection in both buildings. You must install over-voltage and sneak current protectors in accordance with subsections “Protective Devices” and “Cable and Primary Protector Bonding and Grounding” of NFPA 70: NEC Article 800 , or local safety codes.
Field installed sneak current protectors must have a maximum current rating of 350mA and a minimum voltage rating of 600V.
The following over-voltage and sneak current protection devices are approved for use with G450 Branch Gateway:
Media modules
Approved over-voltage and sneak current protection devices
Avaya MM710, MM710B, or MM340 T1/E1 media modules
Over-voltage and sneak current protection for these interfaces are provided on the media modules themselves.
G450 Branch Gateway v4 does not support the MM340 media module.
Avaya MM711, MM714, MM714B, and MM716 analog media modules
Over-voltage and sneak current protection for these interfaces is provided on the media modules themselves. Normally, the local phone company provides primary over-voltage protection for incoming trunks.
Analog voice terminals require one of the following types of combined over-voltage and sneak current protection at both building entry points:
  • Gas tube with heat coil. 4B1E-W
  • Solid state with heat coil. 4C1S
  • IROB (In-Range Out-of-Building). 146C (4 - lines) or 146H (25 - lines)
Avaya MM712 and MM717 DCP media modules
Out-of-building connections require either the 146E IROB or 4C3S-75 solid state protectors for over-voltage and sneak current.
Avaya MM722 ISDN-BRI media modules
Over-voltage and sneak current protection are provided on the media modules themselves.
Avaya MM720 and MM721 ISDN-BRI media modules
All out-of-building installations on both trunk (network) and line (customer) sides require either the 146E IROB or 4C3S-75 solid state protectors for over-voltage and sneak current. Trunk side applications also require an NT-1 device.
Warning:
Only service-trained personnel can install these circuit protection devices.